USRobotics V.34 manual

COURIER HIGH SPEED MODEM Courier V.34 Dual Standard Fax USER MANUAL[...]

COURIER HIGH SPEED MODEMS ii How to Use This Manual HOW TO USE THIS MANUAL This manual contains operating instructions for Courier Dual Standard V.34 and Courier V.34 modems. These modems have many similar features except for the signaling they use to connect with remote modems at high speeds: V.32/V.32 terbo , HST, V.FC, or V.34. Courier HST Dual [...]

COURIER HIGH SPEED MODEMS How to Use This Manual iii A NOTE ON COMMUNICATIONS SOFTWARE If you're using a computer rather than a terminal, you need communications software. Many brands are available, all of which are based on the modem's AT command set. Some users prefer their communica tions software to take control of the modem, and are [...]

U.S. Robotics, the U.S. Robotics logo, and HST are registered trademarks of U.S. Robotics, Inc. Courier HST Dual Standard Fax, Courier V.32 terbo Fax, Total Control, and Adaptive Speed Leveling (ASL) are trademarks of U.S. Robotics, Inc. V.Fast Class and V.FC are trademarks of Rockwell International. Any trademarks, tradenames, service marks or ser[...]

COURIER HIGH SPEED MODEMS Table of Contents v TABLE OF CONTENTS How to Use this Manual ii Table of Contents v Limited Warranty ix FCC Registration Numbers x IC (Industry Canada) x Connecting to the Telephone Company x Radio and Television Interference x For Canadian Modem Users xi PART I. INSTALLATION AND OPERATION Chapter 1   Features and Co[...]

COURIER HIGH SPEED MODEMS vi Table of Contents Reset the Jumpers 3-5 Set DIP Switches 3-6 Installing the Modem 3-6 Testing the Installation 3-8 Chapter 4   Data Mode Command Summary Command Set Usage 4-1 Basic Commands 4-3 Dialing/Answering 4-4 Dialing 4-4 Dial Options 4-4 Cancel Dialing 4-6 Store Phone Numbers 4-7 Redialing 4-7 Answer Mode 4[...]

COURIER HIGH SPEED MODEMS Table of Contents vii Last-Dialed Number Inquiry (DL?) 6-8 Stored Command String Query (&ZC?) 6-8 Help Screens 6-8 Stop/Restart Display 6-8 Cancel Display 6-8 Basic Command Set ($) 6-8 Extended Command Set (&$) 6-9 Dialing (D$) 6-10 S-Register Functions (S$) 6-10 Percent Commands (%$) 6-11 PART II. REFERENCE Append[...]

COURIER HIGH SPEED MODEMS viii Table of Contents Appendix C   Alphabetical Command Summary Command Set Usage C-1 Basic Command Set C-2 Ampersand (&) Command Set C-9 Percent (%) Command Sets C-18 Appendix D   Dial Security/Remote Access Dial Security D-1 Remote Access D-10 Appendix E   Troubleshooting Appendix F   Synchro[...]

COURIER HIGH SPEED MODEMS Warranty Information ix LIMITED WARRANTY U.S. Robotics, Inc., warrants to the original consumer or other end user purchaser that this product is free from defects in materials or workmanship for a period of two years from the date of purchase. During the warranty period, and upon proof of purchase, the product will be repa[...]

COURIER HIGH SPEED MODEMS x Warranty Information FCC REGISTRATION FCC68: CJEUSA-73130-FA-E RINGER EQUIVALENCE: 0.4B FCC15: CJE-0263 (External modem) CJE-158-243 (Internal modem) CJE-0151-243 (Daughterboard) IC (INDUSTRY CANADA) This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the [...]

COURIER HIGH SPEED MODEMS Regulatory Information xi 15 of FCC rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this device does cause interference to radio or television reception, which[...]

COURIER HIGH SPEED MODEMS xii Regulatory Information compliance with the above conditions may not prevent degradation of service in some situations. Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by a user to this equipment, or equipment malfun[...]

COURIER HIGH SPEED MODEMS Features and Compatibility 1- 1 CHAPTER 1. FEATURES AND COMPATIBILITY INTRODUCTION Congratulations! The Courier modem you've purchased repre - sents powerful, advanced electronic design that offers excep - tional reliability, compatibility and flexi bility at all standard rates up to 28,800 or 28.8K bits per second (b[...]

COURIER HIGH SPEED MODEMS 1- 2 Features and Compatibility Universal Connect Courier high speed modems automatically detect and connect at the fastest available speed. Adaptive Speed Leveling (ASL) Like most high speed modems, Courier modems fall back to the next lower speed—for example, 19.2K, then 16.8K in V. terbo mode—if poor line conditions[...]

COURIER HIGH SPEED MODEMS Features and Compatibility 1- 3 Flow Control/Variable Serial Port Rates Flow control, required under error control, also allows the local serial port (DTE) rate to be set higher than the link (connection) rate, enabling greater efficiency and throughput. If your equipment and software support high rates, data can be sent f[...]

COURIER HIGH SPEED MODEMS 1- 4 Features and Compatibility Programmable Nonvolatile Memory You can tailor your own default settings and store them in non - volatile random access memory (NVRAM). Each time the Courier is powered on or reset, it operates at the settings you've specified. See Chapter 4, Appendix B, and Appendix C. Link Rate Negoti[...]

COURIER HIGH SPEED MODEMS Features and Compatibility 1- 5 Modem Settings Displays On command, the modem displays its current settings, a handy way to check your transmission rate, S-Registers and other oper ational controls. Th e modem also displays the defaults stored in non volatile memory as well as its default configuration templates. See Chapt[...]

COURIER HIGH SPEED MODEMS 1- 6 Features and Compatibility COMPATIBILITY The Courier adheres to the following modulation schemes and standards, ensuring com patibility with a wide base of installed modems. Unless other wise indicated, Dual Standard V.34 modems conform to the listed standards. NOTE: The International Telecommunication Union (ITU-T) w[...]

COURIER HIGH SPEED MODEMS Features and Compatibility 1- 7 MNP Levels 2, 3 and 4 error control, level 5 data compression, 1200 bps and higher ITU-T V.54 Analog, digital and remote digital loopback testing Fax Standards The Courier modem provides Group III-compatibility when combined with Class 1 or Class 2.0 fax software. In addition, the modem adhe[...]

COURIER HIGH SPEED MODEMS External Modem Set Up 2- 1 CHAPTER 2. MODEM SET UP HS AA CD OH RD SD TR MR RS CS SYN ARQ/ FAX VOICE/DATA V.34 Fax with V.FC and V.32 bis Figure 2.1—Courier V.34 Modem Reminder To prevent overheating, do not cover the vents on the top of the modem case. SWITCHES ON THE MODEM Voice/Data This push-button switch is used prim[...]

COURIER HIGH SPEED MODEMS 2- 2 External Modem Set Up Volume Control This is a slide switch underneath the right side panel of the modem, near the front corner. Sliding it toward the front of the modem increases the modem speaker’s volume; sliding it toward the rear of the modem decreases the volume. FRONT PANEL INDICATORS ON THE MODEM The modem h[...]

COURIER HIGH SPEED MODEMS External Modem Set Up 2- 3 • If you r machine has other than a 25- or 9-pin port, check your computer documentation or consult your dealer to find out what type of RS-232 connector is required. WARNING: If you're planning to use the high speed computer-to-modem rates of 115.K, 57.6K or 38.4K bps, follow the instruct[...]

COURIER HIGH SPEED MODEMS 2- 4 External Modem Set Up Refer to Appendix G. . . . . . if your modem is installed in a Hewlett Packard system that uses the Ack/Enq communications protocol. INSTALLING THE MODEM 1. Turn off the computer or terminal and its peripheral devices. 2. Examine the label on the bottom of the modem. In addition to the summaries [...]

COURIER HIGH SPEED MODEMS External Modem Set Up 2- 5 NOTE: If you have built your own RS-232 cable and it does not support the Data Terminal Ready (DTR) signal, set DIP switch 1 ON, for DTR override. The override causes the modem to operate as if the DTR signal were always ON, and enables the modem to accept commands. Most purchased communications [...]

COURIER HIGH SPEED MODEMS 2- 6 External Modem Set Up TESTING THE INSTALLATION Use the following procedures to verify that your modem is working properly. 1. Turn on your computer or terminal. Then turn the Courier's power switch ON. The following front panel indicators, or LEDs, will light up on the modem. CD Carrier Detect, if you have set DI[...]

COURIER HIGH SPEED MODEMS External Modem Set Up 2- 7 Troubleshooting If your entered command is not displayed , your local echo is OFF. To turn the local echo ON, send the modem the following command: ATE1 <Enter> If double characters appear on the screen , both your modem and software are set to local echo ON. Either set your soft ware to lo[...]

COURIER HIGH SPEED MODEMS 2- 8 External Modem Set Up 5. As a final check, make sure the modem gets a dial tone. Type the following Dial command: ATD <Enter> On receipt of the command, the modem goes off hook and waits for a dial tone. The OH indicator lights up, and you'll hear the dial tone from the modem's speaker. To cancel the o[...]

COURIER HIGH SPEED MODEMS Internal Modem Set Up 3- 1 CHAPTER 3. INTERNAL MODEM SET UP PACKAGE COMPONENTS Your Courier modem package contains the following items: • The modem y ou purchased: Courier V.34 • An RJ11C phone cord • A power adapter • Fax software and manual • A Quick-Reference card WHAT YOU NEED The Courier modem has minimal op[...]

COURIER HIGH SPEED MODEMS 3- 2 Internal Modem Set Up A Telephone Adapter. . . . . .if you have an older telephone installation that does not have the appropriate modular wall jack and plug. Adapters and RJ11C connectors are available from your telephone com pany or computer dealer. YOU SHOULD. . . Refer to Appendix F. . . . . .if your phone line is[...]

COURIER HIGH SPEED MODEMS Internal Modem Set Up 3- 3 If you're only using COM1 for a device, you can skip this sec - tion except for DIP Switches , just before Installing the Modem . If you've already installed devices at both COM1 and COM2, you will have to select either COM3 or COM4. Carefully review the fol lowing sec tion for complete[...]

COURIER HIGH SPEED MODEMS 3- 4 Internal Modem Set Up Select an Interrupt Request (IRQ) IBM-compatible computers reserve IRQ4 for COM1 and IRQ3 for COM2, as shown below. Some communication programs support reserved IRQs for two serial ports. Serial Serial Port Port IRQ Address (Hex) COM1 IRQ4 3F8 − 3FF COM2 IRQ3 2F8 − 2FF COM3 IRQ4* 3E8 − 3EF [...]

COURIER HIGH SPEED MODEMS Internal Modem Set Up 3- 5 Reset the Jumpers Figure 3.1 shows an enlarged view of the modem's jumper switches. If you hold the modem so that the rear panel is at the bottom and the edge connector is at the left of the circuit board you can locate the COM and IRQ jumpers near the center left side of the board. Each jum[...]

COURIER HIGH SPEED MODEMS 3- 6 Internal Modem Set Up Set DIP Switches A ten-position bank of Dual In-Line Package (DIP) switches is located at the rear of the modem. A summary of the DIP switch functions and options is in Appendix B in this manual and on the Quick Reference Card. WARNING: Check your software documentation for its requirements, part[...]

COURIER HIGH SPEED MODEMS Internal Modem Set Up 3- 3. Unscrew the solid bracket at the back of any available standard half-card slot.) The bracket will pop out of the back, leaving an opening in DIP switches. 4. and a 2-inch groove. These grooves are lined on both sides with metal guides. Insert the modem board into the slot modem board's edge[...]

COURIER HIGH SPEED MODEMS 3- 8 Internal Modem Set Up 7. If you currently have a phone plugged into the wall jack, disconnect it. Plug one end of the phone cable that came with the modem into the TELCO jack at the rear of the modem. This allows the modem to switch into the tele - phone network, get a dial tone, and so on. Plug the other end of the c[...]

COURIER HIGH SPEED MODEMS Internal Modem Set Up 3- 9 3. Perform the function that lets you send AT commands to the modem, that is, puts the computer in Terminal mode . Some communications programs do this automatically upon loading. Others require you to display a communications or terminal screen, type a Function key, or perform some other operati[...]

COURIER HIGH SPEED MODEMS 3- 10 Internal Modem Set Up c. Make sure your software has put the computer in Terminal mode, so that you can send the modem commands. Then review Step 4, on the previous page. d. Be sure that DIP switches 1 and 6 are set ON or OFF according to your terminal or software requirements. The table in Appendix B explains each f[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 1 CHAPTER 4. DATA MODE OPERATIONS The information in this chapter applies to asynchronous calls only. For synchronous operations, refer to Appendix F. Detailed command descriptions are in this chapter. Additional command summaries are in Appendix C, on the bottom panel of the modem, and in the Quick[...]

COURIER HIGH SPEED MODEMS 4- 2 Data Mode Operations 3. All commands except A/, A> and +++ are preceded by the AT ( attention ) prefix and are executed with the Enter/Carriage Return key (<Enter>). 4. Command length = 60 characters maximum. The modem doesn't count the AT prefix, Carriage Return character, or spaces. It counts (but does[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 3 • Configuration: Echo/Speaker Result Codes Modulation Error Control/Data Compression Data Rates RS-232 Signal Operations Flow Control • S-Registers • Inquiry and Help • Testing • International Calls • Miscellaneous Commands For an alphabetical listing of commands, check the first page [...]

COURIER HIGH SPEED MODEMS 4- 4 Data Mode Operations DIALING/ANSWERING Dialing D n Dial the specified phone number; also execute Dial options. The maximum number of characters allowed is 60, including the AT prefix, punctuation and spaces. The Carriage Return (Enter key) isn't counted as a character. NOTE: With the exception of the following Di[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 5 " Dial the letters that follow (in an alphabetical phone number). NOTE: If you are including another command after the dial string, use closing quotation marks before the additional command. ! Transfer a call (flash the switch-hook). This command applies to modems in installations where other[...]

COURIER HIGH SPEED MODEMS 4- 6 Data Mode Operations R Reverse frequencies. This command allows calls to an originate-only modem. It reverses the modem's originate/answer frequencies, forcing the Courier to dial out at the answer frequency. The command fol lows the Dial command, before or after the phone number: AT D1234567R <Enter> X2-X7[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 7 Store Phone Numbers &Z n=s This command stores up to ten numbers, where n is the position 0 − 9 in nonvolatile memory, and s is the phone number string. The number-string may be up to 40 characters long, including any Dial command options. AT &Z2=555-6789 <Enter> Do not include mod[...]

COURIER HIGH SPEED MODEMS 4- 8 Data Mode Operations The cycle continues until the modems connect or the modem reaches a maximum of 10 attempts. The 10-try limit is mandated by Industry Canada (IC) to pre vent tying up local telephone company exchanges with uncon nected calls. A> This command combines the features of both the A/ and > commands[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 9 When the modem senses a call coming in, it sends the result code RING to your screen, goes off hook, and sends the remote modem a high-pitched answer tone. If there is no Carrier Detect within 60 seconds, the modem hangs up. If the connection is made, the modem sends a CONNECT result code. When th[...]

COURIER HIGH SPEED MODEMS 4- 10 Data Mode Operations +++ Escape code operations. Once the modem is online to another system, the only command it recognizes is an escape code of three typed pluses, which forces the modem back to Command mode. Do the following when issuing the command: • Wait one second after sending the last item of data • Type:[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 11 Returning Online O n If DIP switch 9 is ON (on detection of the escape code the modem maintains the connection), you can issue commands and then toggle the modem back online with the O n command, as in this example: AT Q1 O <Enter> There are two ways to return online. ATO0 Return online (no[...]

COURIER HIGH SPEED MODEMS 4- 12 Data Mode Operations When you power on the Courier, it loads the settings stored in NVRAM if DIP switch 10 is OFF. Until you write your own settings to NVRAM, the defaults stored there are the same as the permanent ROM factory settings stored in position 1, &F1. To view the &F1 settings, select option 5 of th[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 13 Resetting the Modem Z Software reset to NVRAM settings when DIP switch 10 is OFF (factory setting). If DIP switch 10 is OFF, the modem resets to the &F0 configuration template, with no flow control. NOTE: Use the ATZ command also if you've changed the position of DIP switches 1 − 7 or [...]

COURIER HIGH SPEED MODEMS 4- 14 Data Mode Operations In some microcomputer documentation, the term duplex is applied to local online echoing, although the term is not techni - cally accurate. F0 Online echo ON. Sometimes called half duplex . As the modem transmits data to a remote system, it also sends a copy of the data to the screen. F1 Online ec[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 15 X n Result code set options. Use the following table (Default = X7, all codes except 12/VOICE). For result codes for synchronous operations, see Appendix F. Setting Result Codes X0 X1 X2 X3 X4 X5 X6 X7 0/OK •••••••• 1/CONNECT •••••••• 2/RING •••••••?[...]

COURIER HIGH SPEED MODEMS 4- 16 Data Mode Operations Result Code Meaning 0/OK Command has been executed. 1/CONNECT Connection with another modem; if set to X0, connection may be between 300 and 28.8 bps; if X1 or higher, connection is at 300 bps. 2/RING Incoming ring detected. 3/NO CARRIER Carrier detect has failed or carrier has been dropped due t[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 17 Additional Result Code Subsets NOTE: ARQ (Automatic Repeat Request) is used in this manual to denote calls under error control. &A n Enable/disable additional result code subsets. See the X n command earlier in this chapter. &A0 ARQ result codes are disabled. This setting does not affect [...]

COURIER HIGH SPEED MODEMS 4- 18 Data Mode Operations 93/CONNECT 21600/V32 96/CONNECT 21600/ARQ/V32 97/CONNECT 21600/VFC 98/CONNECT 21600/ARQ/VFC 101/CONNECT 24000/VFC 102/CONNECT 24000/ARQ/VFC 105/CONNECT 26400/VFC 106/CONNECT 26400/ARQ/VFC 109/CONNECT 28800/VFC 110/CONNECT 28800/ARQ/VFC 139/CONNECT 14400/VFC 141/CONNECT 14400/ARQ/VFC 143/CONNECT 1[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 19 Modulation B n Handshake options. There are three commands that apply to international calls above 1200 bps  B n , &G n , &P n . See International Calls later in this chapter for information on the other two settings. B0 I TU-T (formerly CCITT) answer sequence. Default. This is require[...]

COURIER HIGH SPEED MODEMS 4- 20 Data Mode Operations &M6 The modem enters V.25 bis synchronous mode, using a character-oriented link protocol similar to BISYNC. See Appendix F for more information &M7 The modem enters V.25 bis synchronous mode, using the HDLC link protocol. &K n Enable/disable data compression. &K0 Data compression [...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 21 Data Rates The modem can be set to a fixed or variable serial port rate. A fixed rate sets the modem for the highest possible throughput and provides the best performance. A variable rate allows the modem to switch to match the more limited rate on the phone connection. Your software must support[...]

COURIER HIGH SPEED MODEMS 4- 22 Data Mode Operations &B2 Fixed for ARQ calls/Variable for non-ARQ calls. Answer mode only. When the modem goes off hook and connects in ARQ mode, it shifts its serial port rate up to a user-specified rate, for example, 38.4K bps. If the connection is not under error con trol, the modem behaves as if it were set t[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 23 The options are as follows. &N1 300 bps &N9 16.8K bps (HST, terbo, &N2 1200 bps V.FC, and V.34 only) &N3 2400 bps &N 10 19.2K bps ( terbo , V.FC, &N4 4800 bps and V.34 only) &N5 7200 bps &N11 21.6K bps ( terbo , V.FC, &N6 9600 bps and V.34 only) &N7 12K bps[...]

COURIER HIGH SPEED MODEMS 4- 24 Data Mode Operations Return online with the O n command, or hang up with the H n command. &D2 Normal DTR operations. The terminal or computer must send a DTR signal for the modem to accept commands. Dropping DTR terminates a call. &S n The modem sends the computer or terminal a Data Set Ready (DSR) signal via[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 25 Hardware Control The modem drops the Clear to Send (CTS) signal it's been sending to the computer or terminal when the modem's buffer nears 90% capacity. It starts sending CTS again when the buffer is about half full. Software Control The modem sends the computer or terminal the standar[...]

COURIER HIGH SPEED MODEMS 4- 26 Data Mode Operations Transmit Data Buffer Sizes The Transmit Data refers to the data from the computer, which the modem is to transmit over the phone line. The size of the Transmit data buffer depends on whether the connection is under error control or not, as follows. • ARQ connections: 3.25K bytes. • Non-ARQ co[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 27 &H3 Use both hardware and software flow control. If you are unsure about what your equipment supports, select this option. But keep the warning, above, in mind about software flow control. Received Data Flow Control Separate commands, &R n (hardware) and &I n (software), con - trol th[...]

COURIER HIGH SPEED MODEMS 4- 28 Data Mode Operations NOTE: Because of the risk described in the above warning, the settings that follow are only recommended for users whose data does not include XON/XOFF control characters. &I1 The Cour ier acts on your typed XON/XOFF commands, <Ctrl>-S or <Ctrl>-Q, and passes them to the remote com[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 29 In non-ARQ mode, a Courier set to &I5 operates as though flow control were disabled (&I0); it does not look for your typed XON/XOFF commands. However, it looks for XON/XOFF characters coming in over the phone link. When the remote operator sends XON/XOFF com - mands, the Courier either re[...]

COURIER HIGH SPEED MODEMS 4- 30 Data Mode Operations INQUIRY AND HELP The modem displays information such as the current modem settings, product code, and call duration. It also displays summary information for every command that the modem supports. For more information on Inquiry and Help commands, including sample displays, see Chapter 6. TESTING[...]

COURIER HIGH SPEED MODEMS Data Mode Operations 4- 31 &P n This command sets the ratio of the off-hook/on-hook (make/ break) interval for pulse dialing. The default sets the modem for use in North America. The ratio must be changed if the modem is used in the United Kingdom and some Common - wealth countries. &P0 Make/break ratio, U.S./Canad[...]

COURIER HIGH SPEED MODEMS 4- 32 Data Mode Operations &ZC= s Write the following command string s to NVRAM. The command string may be up to 30 characters long; spaces are not counted. This command can be used so that you can call another modem without loading your communications software. After storing a command, you can program the voice/data s[...]

COURIER HIGH SPEED MODEMS Fax Operations 5- 1 CHAPTER 5. FAX OPERATIONS AND CALL DETECTION FAX OPERATIONS Compatibility The Courier modem provides Group III-compatibility when combined with Class 1 or Class 2.0 fax software. In addition, the modem adheres to the following standards. NOTE: The International Telecommunication Union (ITU-T) was former[...]

COURIER HIGH SPEED MODEMS 5- 2 Fax Operations If you have a problem, however, and think the modem may be in the wrong mode, you can use one of the following AT commands to manually switch the modem: AT+FCLASS=0 (Switch to Data mode) <Enter> AT+FCLASS=1 (Switch to Class 1 Fax mode) <Enter> AT+FCLASS=2.0 (Switch to Class 2.0 Fax mode) <[...]

COURIER HIGH SPEED MODEMS Fax Operations 5- 3 FCC Notice FCC part 68, rules regarding fax operation, has been amended as follows: Telephone facsimile machines—identification of the sender of the message: It shall be unlawful for any person within the United States to use a computer or other electronic device to send any message via a telephone fa[...]

COURIER HIGH SPEED MODEMS 5- 4 Fax Operations CALL DETECTION Courier High Speed modems support Call Detection, which is a method of reporting whether an incoming call is Data, Fax Class 1, or Fax Class 2.0. It is especially useful for Bulletin Board systems, as it automates recognition of different calls from multiple users. Call Detection is an op[...]

COURIER HIGH SPEED MODEMS Queries and Help Screens 6- 1 CHAPTER 6. QUERIES AND HELP SCREENS USER INQUIRIES (I n ) The Inquiry command has 11 options. The most commonly used options display the following information: ATI3 Call duration ATI4 Current settings ATI5 NVRAM settings ATI6 Link diagnostics summary I0 The modem returns a 4-digit product code[...]

COURIER HIGH SPEED MODEMS 6- 2 Queries and Help Screens ati4 USRobotics Courier Dual Standard V.34 Fax Settings... B0 C1 E1 F1 M1 Q0 V1 X1 BAUD=57600 PARITY=N WORDLEN=8 DIAL=PULSE ON HOOK TIMER &A1 &B0 &C1 &D2 &G0 &H0 &I0 &K1 &L0 &M4 &N0 &P0 &R1 &S0 &T5 &X0 &Y1 %N6 S00=000 S01=000 [...]

COURIER HIGH SPEED MODEMS Queries and Help Screens 6- 3 I6 During a connection, the modem monitors and stores infor - ma tion about link operations. When the call is ended, you can request a diagnostic summary, as in the following example. The duration of the last call or real time is displayed depending on the K n setting. ati6 USRobotics Courier [...]

COURIER HIGH SPEED MODEMS 6- 4 Queries and Help Screens Link Timeouts : Protocol detection problems: communications were severed momentarily, and the modems probably recovered. This does not indicate the retry timeout. Link Naks : Negative acknowledgments (one or more blocks). Data Compression : Indicates the type of data compres sion negotiated fo[...]

COURIER HIGH SPEED MODEMS Queries and Help Screens 6- 5 GSTN (General Switch Telephone Network) Clear Down: The connection was non-ARQ and DTR was dropped from one side of the connection, or the DISC frame was corrupted due to noise. Illegal Command Code : The modem received an invalid V.42 bis (compression) frame. Inactivity timeout : The modem de[...]

COURIER HIGH SPEED MODEMS 6- 6 Queries and Help Screens Unable to Retrain : After several attempts, disturb ances on the phone line prevented the mo dems from retraining, and they could no longer transmit or receive data. XID Timeout : The modems failed to negotiate the V.42 Detection (XID Exchange) phase. Dial Security Disconnect Reason: Possible [...]

COURIER HIGH SPEED MODEMS Queries and Help Screens 6- 7 I10 View Dial Security Account status. For security administrators only, unless local security is disabled, S53=0 or S53.2=0. ati10 USRobotics Courier Dual Standard V.34 Fax DIAL SECURITY STATUS DIAL SECURITY ENABLED:[N] LOCAL SECURITY ENABLED:[N] PROMPTING ENABLED:[N] FORCED AUTOPASS:[N] LOCA[...]

COURIER HIGH SPEED MODEMS 6- 8 Queries and Help Screens LAST-DIALED NUMBER QUERY (DL?) At this command the modem displays the number stored in the last-dialed number buffer: ATDL? <Enter> STORED COMMAND STRING QUERY (&ZC?) At this command the modem displays the command string stored in NVRAM with the &ZC= s command: AT&ZC? <Ent[...]

COURIER HIGH SPEED MODEMS Queries and Help Screens 6- 9 at$ HELP, Command Quick Reference (CTRL-S to Stop, CTRL-C to Cancel) &$ HELP, Ampersand Commands Kn n=0 Call Duration Mode %$ HELP, Percent Commands n=1 Real Time Clock Mode A/ Repeat Last Command Mn n=0 Sp eaker Off A> Continuously Repeat Command n=1 Speaker On Until CD AT Command Mode[...]

COURIER HIGH SPEED MODEMS 6- 10 Queries and Help Screens Dialing (D$) At ATD$, the Courier displays this Dial command summary: atd$ HELP, Dial Commands (CTRL-S to Stop, CTRL-C to Cancel) 0-9 Digit s to Dial * Auxiliary Tone Dial Digit # Auxiliary Tone Dial Digit T Tone Dialing P Pulse Dialing R Call an Originate Only Modem , Pause (Wait for S8 Time[...]

COURIER HIGH SPEED MODEMS Queries and Help Screens 6- 11 Percent Commands (%$) At AT%$, the Courier displays a screen that shows a partial summary of the percent command functions. A second screen, activated by pressing any key, shows the remaining registers. The first screen is as follows. at%$ HELP, Percent Commands (CTRL-S to Stop, CTRL-C to Can[...]

COURIER HIGH SPEED MODEMS Link Negotiation and Error Control A- 1 APPENDIX A. LINK NEGOTIATION (HANDSHAKING) AND ERROR CONTROL This appendix includes information on how U.S. Robotics modems negotiate with remote modems for the rate and other characteristics of each connection. In addition, you'll find information on error control and, especial[...]

COURIER HIGH SPEED MODEMS A- 2 Link Negotiation and Error Control If the remote modem has V.34 capability, the two modems use a line probing technique to determine the highest speed possible under current line conditions, and complete the connection. If the remote modem does not have V.34 capability, a calling Courier modem listens to the other mod[...]

COURIER HIGH SPEED MODEMS Link Negotiation and Error Control A- 3 OTHER V. PROTOCOL OPERATIONS Earlier, lower-speed V. protocols do not employ line probing. Instead they use predefined answer tones to specify, or identify, speed capabilities. These protocols define the following maximum speeds. • V.32 terbo : 19.2K bps, with an additional Courier[...]

COURIER HIGH SPEED MODEMS A- 4 Link Negotiation and Error Control Dual Standard Handshaking We recommend that Dual Standard modems be set to retain the default B0 and &N0 settings. This allows them to connect with V. protocol modems and HST modems in both Originate and Answer modes at a variety of speeds. An originating Dual Standard modem set [...]

COURIER HIGH SPEED MODEMS Link Negotiation and Error Control A- 5 V.42 Handshaking This international standard includes a two-stage hand shaking process: • A Detection phase that is based on an exchange of predefined characters. • LAPM (Link Access Procedures for Modems) Nego ti - ation. In this phase, the modems identify their capabilities con[...]

COURIER HIGH SPEED MODEMS A- 6 Link Negotiation and Error Control P ossible sizes are as follows: Bits Entries 9 512 10 1024 11 2048 U.S. Robotics modems use 11-bit, or 2048-entry dictionary, but drop down if the remote modem uses a 9- or 10- bit dic tionary. The size of the dictionary for a call is reported in the ATI6 display. • Maximum string [...]

COURIER HIGH SPEED MODEMS Link Negotiation and Error Control A- 7 Throughput Guidelines The following guidelines should help to make the most of the modem's advanced performance features. In many instances, experimentation and experience will indicate what works best for your applications. 1. Optimal throughput is attained under the following [...]

COURIER HIGH SPEED MODEMS A- 8 Link Negotiation and Error Control Xmodem Throughput may be reduced if your version uses short block lengths (128 bytes). Some versions use larger blocks (1K blocks). Throughput is also reduced by overhead (error control protocol information). Ymodem There is an improvement over Xmodem, due to larger block lengths (1K[...]

COURIER HIGH SPEED MODEMS Link Negotiation and Error Control A- 9 The tables below indicate the typical throughput, in charac ters per second (cps), that can be expected under the following conditions. • Connection (link) rates of 14.4K, 21.6K, and 28.8K bps, respectively • Serial port rates set at 57.6K bps for the 14.4K bps connection and 115[...]

COURIER HIGH SPEED MODEMS A- 10 Link Negotiation and Error Control 28.8K bps File Type Typical throughput (cps) Text file 6800 .ZIP files 3200 Database files 9600 Graphic files 5800[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 1 APPENDIX B. SUMMARIES AND TABLES CONTENTS The RS-232 Interface, with Pin Definitions Front Panel Indicators DIP Swi tch Summary Default Settings S-Register Summary ASCII Chart[...]

COURIER HIGH SPEED MODEMS B- 2 Summaries and Tables THE RS-232 INTERFACE DESCRIPTION The RS-232 interface is a stan dard developed by the Electronic Industries Association (EIA). It defines the signals and voltages used when data is exchanged between a computer or terminal and a modem or serial printer. Data is transmitted between the devices via a[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 3 PIN ASSIGNMENTS The entire standard covers many more functions than are used in most data communications applications. Pin assignments are factory set in the Courier to match the standard DB-25 assign - ments in the following table. DB-9 connectors for AT- compatible computers should be wired at t[...]

COURIER HIGH SPEED MODEMS B- 4 Summaries and Tables Minimum Requirements Some computer/terminal equipment supports only a few of the RS-232 signal functions set in the Courier. The minimum required for the modem to operate are as follows: Asynchronous Calls DB-25 DB-9 Pin Pin Function 2 3 Transmitted Data 3 2 Received Data 7 5 Signal Ground 20 4 Da[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 5 If you decide to build your own cable, use a low-capacitance cable. To further minimize the capacitance, connect only those functions (pins) that your application requires. FRONT PANEL INDICATORS Symbol Meaning Status HS High Speed All calls above 2400 bps: ON during call progress, after completio[...]

COURIER HIGH SPEED MODEMS B- 6 Summaries and Tables Symbol Meaning Status MR Modem Ready/ ON when the Courier is powered on. Test Mode Flashes when the modems retrain, including online fallback, or while the modem is in Test mode. RS Request to ON if your terminal or software supports RTS Send and sends the RTS signal. OFF if the Courier is set to [...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 7 DIP SWITCH SUMMARY PURPOSE The DIP switches, located at the rear of the modem, are for adapting the modem to your equipment and personal re quire - ments. If necessary, review your software documentation. Some users are able to move a single switch with a finger tip. If this doesn't work for [...]

COURIER HIGH SPEED MODEMS B- 8 Summaries and Tables Factory Switch Setting Function 3 ON Result Code Display OFF Results suppressed ON Results enabled 4 OFF Command Mode Local Echo OFF Keyboard commands displayed ON Echo suppressed 5 ON Auto Answer OFF Modem answers on first ring ON Auto answer disabled 6 OFF Carrier Detect Operations OFF Courier s[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 9 DEFAULT SETTINGS USER-PROGRAMMABLE DEFAULTS You can create your own default configuration and store it in nonvolatile random access memory (NVRAM) using the &W command described in Chapter 4. As long as DIP switch 10 is OFF when you power on the modem, your defaults are loaded into the modem&a[...]

COURIER HIGH SPEED MODEMS B- 10 Summaries and Tables Table B.3   &F1 Hardware Flow Control Default Template NVRAM Options Setting Description Handshake option B0 ITU-T answer sequence Error control/sync &M4 Normal/error control Data compression &K1 Enabled Transmit data hardware &H1 Hardware flow control Rec'd data hardwa[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 11 The &F2 and &F3 factory setting templates are similar to the &F1, with the exception of the commands which are highlighted in bold in tables B.4 and B.5. Table B.4   &F2 Software Flow Control Template NVRAM Options Setting Description Handshake option B0 ITU-T answer sequenc[...]

COURIER HIGH SPEED MODEMS B- 12 Summaries and Tables Table B.5   &F3 HST Cellular Template NVRAM Options Setting D escription Handshake option B1 HST-mode/Bell answer tone Normal/error control/sync &M4 Normal/error control Data compression &K1 Enabled Transmit data flow control &H1 Hardware flow control Rec'd data hardwar[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 13 If DIP switch 10 is ON when the modem is powered on, or you load factory template 0 (&F0), the following settings take effect. The differences between factory template 0 (&F0) and factory template 1 (&F1) are noted in bold. Table B.6   &F0 No Flow Control Low PerformanceTemp[...]

COURIER HIGH SPEED MODEMS B- 14 Summaries and Tables Table B.7   NVRAM Options Factory NVRAM S-Register Options Setting S0 Auto Answer 1 S2 Escape code character 43 S3 Carriage Return character 13 S4 Line Feed character 10 S5 Backspace cha racter 8 S6 Dial wait-time, sec. 2 S7 Carrier wait-time, sec. 60 S8 Dial pause, sec. 2 S9 Carrier Detect[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 15 S-REGISTER SUMMARY USAGE The default values are those users typically require. Change the settings of an S-Register with the ATS r = n command, where r is the register and n is a decimal value from 0-255: ATS13=8 <Enter> The modem does not perform a value-range check. Some values you select[...]

COURIER HIGH SPEED MODEMS B- 16 Summaries and Tables Register Default Function S0 See DIP Sets the numbe r of rings on which to Switch 5 answer when in Auto Answer mode. S0=0 disables Auto Answer, the same as DIP switch 5 ON (factory setting). S0=1 enables Auto Answer and the modem answers on the first ring. NOTE: If DIP switch 5 is OFF and S0=0, A[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 17 Register Default Function S8 2 Sets the duration, in seconds, for the pause (,) option in the Dial command and the pause between command re-execu tions (> and A> commands). S9 6 Sets the required duration, in tenths of a second, of the remote modem's carrier signal before recognition b[...]

COURIER HIGH SPEED MODEMS B- 18 Summaries and Tables Register Default Function S13 0 Bit-mapped register. Select the bit(s) you want on and set S13 to the total of the v alues in the Value column. For example, ATS13=20 enables bit 2 (value = 4) and bit 4 (value = 16). Or use ATS r . b =0 (OFF) or 1 (ON). For example, ATS13.0=1 .3=1 turns on bits 0 [...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 19 Register Default Function S15 0 Bit-mapped register. To set the register, see the instructions for S13. Bit Value Result 0 1 Disable the modem's extra high-frequency equalization if it causes problems on shorter- link calls  HST-modems only 1 2 Disable online fallback 2 4 Disable 450 bps [...]

COURIER HIGH SPEED MODEMS B- 20 Summaries and Tables Register Default Function S16 0 Bit-mapped test register. To set the register, see the instructions for S13. For information on testing, see Appendix H. Bit Value Result 0 1 Analog Loopback 1 2 Dial test 2 4 Test pattern 3 8 Remote Digital Loopback 4 16 Reserved 5 32 Reserved 6 64 Reserved S17 0 [...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 21 Register Default Function S24 150 Sets the duration, in 20-millisecond units, between pulsed DSR signals when the modem is set to &S2 or &S3. The default is 3 seconds. S25 5 Sets DTR recognition time in 1/100th of a second units. S26 1 Sets the duration, in 1/100th of a second units, of t[...]

COURIER HIGH SPEED MODEMS B- 22 Summaries and Tables Register Default Function 7 128 Unusual software incompati - bility. Some software may not accept 7200, 12000, 14400, 16800, 19200 and 21600 bps result codes. This setting disables the codes and displays the 9600 code instead. The call's actual rate can be viewed on the ATI6 screen. Error co[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 23 Register Default Function Setting S28 t o zero eliminates the extra tones, resulting in a faster connect time if, for example, the modem is set to use V.21 modulation (300 bps) or V.23 modulation (1200 bps). S29 20 Sets the duration, in tenths of a second, of the answer tones sent during V.21 han[...]

COURIER HIGH SPEED MODEMS B- 24 Summaries and Tables Register Default Function S33 0 Setting this register to 1 (S33=1) enables a reduced packet size. S34 0 Bit-mapped register. See instructions for S13. Bit Value Result 0 1 Disable V.32 bis . Used for troubleshooting; U.S. Robotics' Technical Support may require that you disable V.32 bis for [...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 25 Register Default Function S39 − S40 0 Reserved. S41 0 Sets the number of allowable remote access login attempts, thus enabling or disabling remote access. The default setting of zero allows no remote login attempts, thus disabling remote access. A value of 1 or greater enables remote access. If[...]

COURIER HIGH SPEED MODEMS B- 26 Summaries and Tables Register Default Function S51 0 Bit-mapped register. See instructions for S13. Bit Value Result 01 Disable MNP/V.42 for V.22 (1200 bps) 12 Disable MNP/V.42 for V.22 bis (2400 bps) 24 Disable MNP/V.42 for V.32/V.32 bis /V.32 terbo (9600/14,400/19,200/ 21,600 bps). 3 − 6 _ Reserved 7 128 Custom A[...]

COURIER HIGH SPEED MODEMS Summaries and Tables B- 27 Register Default Function S53 0 Bit-mapped register. Select the Dial Security features you want enabled by setting S53 to the total of the values in the Value column in the table below. For example, S53=3, enables Dial Security with prompting. S53=5 enables Dial Security, and local-access passwor[...]

COURIER HIGH SPEED MODEMS B- 28 Summaries and Tables Register Default Function S55 0 Trellis code bit-mapped register used primarily by U.S.Robotics Technical Support for debugging purposes. S56 0 Bit-mapped register primarily used by U.S.Robotics Technical Support for debugging purposes. Bit 6 (ATS56.6=1) disables V.34 modulation. Bit 7 (ATS56.7=1[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 1 APPENDIX C. ALPHABETICAL COMMAND SUMMARY Additional command summaries are in Chapter 4, on the bottom panel of the modem, and in the Quick-Reference Card. COMMAND SET USAGE Follow these guidelines: 1. Your software must be loaded and if you are using a computer, it must be in Terminal mode[...]

COURIER HIGH SPEED MODEMS C- 2 Alphabetical Command Summary Example (spaces are not required, but are added here for readability): AT &K3 X2 DT 071 312 1234 <Enter> AT Attention; a command follows. &K3 Disable MNP5 data compression; use only V.42 bis compression. X2 Use the X2 result code subset. DT Dial the following number using ton[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 3 DIP Switch 9 Response to +++ OFF Modem goes on hook (hangs up), sends NO CARRIER result code (factory setting) ON Modem maintains connection (Online-Command mode), sends OK result code The factory setting (OFF) forces an automatic disconnect when you issue +++. An advantage of this is that[...]

COURIER HIGH SPEED MODEMS C- 4 Alphabetical Command Summary B n Handshake options for international calls above 1200 bps. B0 ITU-T (formerly CCITT) answer sequence. Default. This is required to answer all V.32-type calls as well as calls from overseas. B1 Bell answer tone. This setting selects HST modulation in Dual Standard modems; but should only[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 5 @ Wait for an answer (with X3 or higher). The @ command can be used in the Dial string to tell the modem to detect at least one ring, wait for five seconds of silence at the other end of the call, and then continue to execute the Dial string. / A slash (/) causes a pause of only 125 millis[...]

COURIER HIGH SPEED MODEMS C- 6 Alphabetical Command Summary I n Inquiry I0 Display product code I1 Display results from ROM checksum I2 Display results from RAM test I3 Display the duration of the last call I4 Display current modem settings I5 Display NVRAM settings I6 Display Dial diagnostics summary of the last call I7 Display product configurati[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 7 M n Speaker (audio monitor). M0 The speaker is always OFF. M1 The speaker is ON until carrier is established (Default). M2 The speaker is always ON, including during data transfer. M3 The speaker is ON after the last digit is dialed and remains ON until carrier is established. O n If DIP s[...]

COURIER HIGH SPEED MODEMS C- 8 Alphabetical Command Summary X n Result code set options. Use the following table (Default = X7, all codes except 12/VOICE). For result codes in synchronous operations, see Appendix F. Setting Result Codes X0 X1 X2 X3 X4 X5 X6 X7 0/OK •••••••• 1/CONNECT •••••••• 2/RING •••••?[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 9 AMPERSAND (&) COMMAND SET &A n Enable/disable additional result code subsets. See the X n command. &A0 ARQ result codes are disabled. &A1 ARQ result codes enabled. &A2 Additional VFC, HST, or V32 modulation indicator. &A3 Additional error control indicator (LAPM, HS[...]

COURIER HIGH SPEED MODEMS C- 10 Alphabetical Command Summary &D n Data Terminal Ready (DTR) operations. At power-on and reset, the modem operates according to the setting of DIP switch 1. This command is not stored in non volatile memory as a power- on/reset default. &D0 DTR override. The modem operates as though the DTR is always ON. &[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 11 &G n This setting applies only to overseas calls at 2400 or 1200 bps. British phone switching systems require the modem to send an 1800 Hz guard tone after it sends an answer tone. Some other European phone networks require a 550 Hz guard tone. Guard tones are not used in the United S[...]

COURIER HIGH SPEED MODEMS C- 12 Alphabetical Command Summary &I2 The Courier acts on your XON/XOFF commands, but removes them from the data stream instead of passing them to the remote computer. This is the recommended setting for ARQ mode. &I3 Hewlett Packard  Host mode. Applies only to modems attached to an HP mainframe that uses the E[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 13 &M1 This setting is exclusive of the modems' error control and is used only for online synchronous mode without V.25 bis . See Appendix F for more information. &M2 Reserved. &M3 Reserved. &M4 Normal/ARQ mode. Default. If an ARQ connection isn't made, the modem op[...]

COURIER HIGH SPEED MODEMS C- 14 Alphabetical Command Summary The options are as follows. &N1 300 bps &N9 16.8K bps (HST, terbo, &N2 1200 bps V.FC, and V.34 only) &N3 2400 bps &N10 19.2K bps ( terbo , V.FC, &N4 4800 bps and V.34 only) &N5 7200 bps &N11 21.6K bps ( terbo , V.FC, &N6 9600 bps and V.34 only) &N7 [...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 15 &S2 This option is for specialized equipment such as automatic callback units. On loss of carrier, the modem sends a pulsed DSR signal with Clear to Send (CTS) following Carrier Detect (CD). &S3 This is the same as &S2, but without the CTS following CD. &S4 The modem sends[...]

COURIER HIGH SPEED MODEMS C- 16 Alphabetical Command Summary &X1 The DTE is the source of the Transmit clock timing signals and sends them to the Courier over the RS-232 interface. This setting is used typically in leased line multiplexed operations. (Multiplexors divide the phone channel so that the channel carries several calls at the same ti[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 17 The function of the voice/data switch is determined by the set - ting of Register S32, as described in Appendix G. Set the voice/data switch function to execute stored command string by setting Register S32 to 9 with the following command: ATS32=9 <Enter> Note that you can reset the[...]

COURIER HIGH SPEED MODEMS C- 18 Alphabetical Command Summary PERCENT COMMAND SET %A n Create and configure security accounts. See Appendix D. %B n Remotely configure the Courier's serial port rate. See Appendix D. %B0 110 bps %B6 9600 bps %B1 300 bps %B7 19,200 bps %B2 600 bps %B8 38,400 bps %B3 1200 bps %B9 57,600 bps %B4 2400 bps %B10 115,20[...]

COURIER HIGH SPEED MODEMS Alphabetical Command Summary C- 19 %E=4 Erase phone nu mbers in accounts 0 − 9. %E=5 Disable Account, Dialback, and New Number fields in accounts 0 − 9 disabled. %F n Remotely configure data format. See Appendix D. %F0 No parity, 8 data bits. %F1 Mark parity, 7 data bits. %F2 Odd parity, 7 data bits. %F3 Even parity, 7[...]

COURIER HIGH SPEED MODEMS C- 20 Alphabetical Command Summary %T Enables the modem, when off hook, to detect the tone frequencies of dialing modems. %T is meant primar ily for use with network applications, but may also be integrated into certain software programs. For example, %T could be used in a security program to identify incoming tone securit[...]

COURIER HIGH SPEED MODEMS Dial Security D- 1 APPENDIX D. DIAL SECURITY AND REMOTE ACCESS OPERATIONS Dial Security is designed to protect networks and data centers from unauthorized access. The kind of security provided by the Courier modem is different from other kinds of dial security where software is used by the computer to control user access. [...]

COURIER HIGH SPEED MODEMS D- 2 Dial Security OVERVIEW The Courier’s Dial Security allows you to configure up to 10 Security accounts. Each security account is stored in nonvolatile memory (NVRAM) and may be set up in one of three ways: • Automatic password access • Prompted password access • Password with Dialback protection Autopass Autopa[...]

COURIER HIGH SPEED MODEMS Dial Security D- 3 If the password is valid, a secure connection is completed. If the password is invalid, the host modem prompts twice more before disconnecting. If there are no password attempts at the remote end, the host modem times out after 60 seconds and disconnects. NOTE: There is no prompting capability in synchro[...]

COURIER HIGH SPEED MODEMS D- 4 Dial Security SET UP YOUR SECURITY ACCOUNT Security accounts are set up via an AT command line structure, rather than a screen format. 1. Set up your Security account using one of 10 accounts (numbered 0 − 9). Each account has five possible fields, as shown in the following table. Password Account Dialback Allow New[...]

COURIER HIGH SPEED MODEMS Dial Security D- 5 Each security function can be configured or modified independently. If a field is to remain as is, just insert a comma, as shown in the following command. It allows the remote user to supply a new Dialback number different from the one stored in the original account record. AT%A0=,,,Y, <Enter> 2. S[...]

COURIER HIGH SPEED MODEMS D- 6 Dial Security 1. Register S53 is the bit-mapped register used to enable Dial Security. The &W command must be used to save Register S53 settings to NVRAM. Otherwise, when the computer is powered off and on again, or the modem is reset using ATZ, it will default to S53=0, Dial Security disabled. To enable Dial Secu[...]

COURIER HIGH SPEED MODEMS Dial Security D- 7 MAINTAIN SECURITY ACCOUNTS Once the local access password is set and protected, the system administrator is the only one who can access account information. To modify or change account information, use the %S= and %E = commands described next. Account Access (%S) Once Dial Security is enabled, you can ac[...]

COURIER HIGH SPEED MODEMS D- 8 Dial Security Erasing Account Information (%E) Use the %E= n command to make system edits. %E=1 Erase local access password. %E=2 Erase autopass password. %E=3 Erase passwords in accounts 0–9. %E=4 Erase phone numbers in accounts 0 − 9. %E=5 Disable Account, Dialback, and New Number fields in accounts 0 − 9. To [...]

COURIER HIGH SPEED MODEMS Dial Security D- 9 Then assign the password as your autopass password. Enter the following command, where n is the number of the account you set up): AT %V=PWn <Enter> You can check to see that you've correctly set up your autopass password by typing the following command: AT I10 <Enter> Your autopass pass[...]

COURIER HIGH SPEED MODEMS D- 10 Remote Access REMOTE ACCESS OPERATIONS You can set a Courier modem so that someone at a remote location can configure your modem. This might be helpful if you have problems making a connection with another modem. For example, if you have trouble connecting with a bulletin board, you can allow the bulletin board opera[...]

COURIER HIGH SPEED MODEMS Remote Access D- 11 To assign a password that allows viewing privileges only, use the command format below: AT%P0=[password] <Enter> To assign a password that allows viewing and configuration privileges, use the command format below: AT%P1=[password] <Enter> Disabling Password Security If you want to disable an[...]

COURIER HIGH SPEED MODEMS D- 12 Remote Access AT THE REMOTE MODEM SITE Remote configuration can be performed at any time during an asynchronous connection. The user performing remote configu - ration can use any modem; it does not have to be a U.S. Robotics model. 1. Make sure the host Courier has been set for remote configuration, as described ear[...]

COURIER HIGH SPEED MODEMS Remote Access D- 13 As mentioned earlier, if the number of unsuccessful login attempts exceeds the set limit, the modem returns online and refuses any further login attempts during the remainder of that connection. When a password is accepted, the Courier indicates that it has entered Remote Access mode and the remote prom[...]

COURIER HIGH SPEED MODEMS D- 14 Remote Access When you make remote configuration changes, the remote prompt is altered to indicate that changes have been made. The prompt will change from: Remote-> to Remote+> If you restore the original configuration (with %C1, explained next), the original prompt is also restored (back to Remote->), indi[...]

COURIER HIGH SPEED MODEMS Remote Access D- 15 %C1 Restore configuration. Use this command to cancel any configuration changes made during remote access, and restore the original configuration. However, commands that have been written to NVRAM (with &W) will not be restored to their previous settings. Additionally, if you have forced immediate c[...]

COURIER HIGH SPEED MODEMS D- 16 Remote Access Command Format When typing commands during the remote access session, no delay between command strings is necessary. For example, you can type the following commands without pausing after each one: • a password: ABCDEF <Enter> • a configuration string: AT&H1&R2&W <Enter> • [...]

COURIER HIGH SPEED MODEMS Remote Access D- 17 2. When remote access has been granted, use the %S= command to access the Dial Security accounts. 3. If you wish, you can view account information by typing the following Inquiry (I) command: AT I10 <Enter> 4. Make any configuration changes and execute them immediately by typing the following comm[...]

COURIER HIGH SPEED MODEMS Troubleshooting E- 1 APPENDIX E. TROUBLESHOOTING You may occasionally encounter one of the problems listed here. They are divided into three categories: Running the SDL.EXE Upgrade Program, Before Establishing the Link, and During Data Transfer. Running the SDL.EXE Upgrade Program Your modem . . . Is indicating an error Tr[...]

COURIER HIGH SPEED MODEMS E- 2 Troubleshooting 3. Check to see that your terminal or software is set to the correct bit rate and word length (7 bits with or without a parity bit, or 8 bits and no parity). If you're using a computer, make sure your software is set to the correct communications port. 4. Check that DIP switch 8 is ON, for command[...]

COURIER HIGH SPEED MODEMS Troubleshooting E- 3 When the modem is in Answer mode, it acts as though a Carriage Return has been entered, but nothing has been typed at the keyboard Your software may be misreading signals from the modem as it automatically sends a Carriage Return and a Line Feed before and after the RING and CONNECT messages. Sending t[...]

COURIER HIGH SPEED MODEMS E- 4 Troubleshooting 6. Make sure your modem's connection rate setting, &N n is correct for the call. If the connection rate is locked at a speed (&N1 − &N14) different from the calling modem's, the Courier hangs up. The factory setting of &N0, variable link operations, allows the two modems to [...]

COURIER HIGH SPEED MODEMS Troubleshooting E- 5 2. If you use memory-resident programs (TSRs), they may be interfering. Try disabling them before you run your com - muni cations software. The same is true of disk-caching programs. 3. Check to see that your software and the modem are set for the same kind of flow control, either hardware or software.[...]

COURIER HIGH SPEED MODEMS E- 6 Troubleshooting 5. If you do return the modem to us, please use the following procedures. a. Ship the unit, postage paid, in its original container. If the original container is not available, pack the modem carefully in a strong box of corrugated cardboard with plenty of packing material. b. Be sure to include your R[...]

COURIER HIGH SPEED MODEMS Synchronous Operations F- 1 APPENDIX F. SYNCHRONOUS AND DEDICATED AND LEASED LINE OPERATIONS SYNCHRONOUS APPLICATIONS Synchronous mode is required for users who need to call, or receive calls, from a Host computer of a large network. The Host is usually a mainframe. There are two ways the Courier can operate in synchronous[...]

COURIER HIGH SPEED MODEMS F- 2 Synchronous Operations NOTE: The term DTE in the following discussion means Data Terminal Equipment, the end-to-end equipment involved in data communications. DTE denotes your terminal or computer and the remote computer. What You Need to Know The network's communications management staff can supply information o[...]

COURIER HIGH SPEED MODEMS Synchronous Operations F- 3 Data Rate Synchronization (&Xn) During synchronous operations, transmit and receive clocks at both ends of the phone link control the precise timing of the data flow. The communications equipment at the remote DTE and your modem and DTE must all handle the data at the same speed. The transmi[...]

COURIER HIGH SPEED MODEMS F- 4 Synchronous Operations V.25 BIS REQUIREMENTS V.25 bis is an ITU-T standard that uses the HDLC or character- oriented protocols to format data. Before you attempt to connect to a synchronous network, you must configure the modem in command (asynchronous) mode by using either an asynchronous device or dumb terminal. V.2[...]

COURIER HIGH SPEED MODEMS Synchronous Operations F- 5 Offline Host/Modem Clock Speed The second phase involves the data rate between the host computer or terminal and its modem during offline mode. The %N command is used to set the clock speed between the modem and host, but this speed is only during offline mode, before the synchronous connection [...]

COURIER HIGH SPEED MODEMS F- 6 Synchronous Operations Recommended Settings When the connection is made and the data rate is determined, host/modem rates may change dramatically to match the connection rate (when in online synchronous mode, the modem is transparent on the line). To avoid this dramatic rate switching (which can be hard on some comput[...]

COURIER HIGH SPEED MODEMS Synchronous Operations F- 7 The Courier and the remote modem must use the same eight-bit data format. The character length must be 7 bits and either ODD or EVEN parity (ODD is preferred), or 8 bits and NO parity. &M7 Use the High Level Data Link Control (HDLC), an ITU-T standard for synchronous communications. HDLC ign[...]

COURIER HIGH SPEED MODEMS F- 8 Synchronous Operations Dial Options 0 − 9 Digits & Flash : Wait for dial tone > (Greater Than) separator < Pause = (Equal Sign) separator P Pulse T Tone . (Period) separator - (Minus) separator Result Codes • SFI (Call failure indication) with optional pa rameters: - CFAB (Abort call) - CFCB (Local modem[...]

COURIER HIGH SPEED MODEMS Synchronous Operations F- 9 Commands and Result Codes NOT Supported • CRI (Call request with identification number) • PRI (Program identifier) • RLI (Request list of identificati on numbers) • RLD (List of delayed call numbers) Hanging Up Since the modem cannot accept commands once it is connected in synchronous mo[...]

COURIER HIGH SPEED MODEMS F- 10 Synchronous Operations The Synchronous Adapter Card You will probably have to purchase and install a synchronous adapter card. These cards are multifunction boards that provide the following functions: • A synchronous port from the DTE to the modem • One or more synchronous protocols. Be sure to find out which pr[...]

COURIER HIGH SPEED MODEMS Synchronous Operations F- 11 Modulation/Connection Rate (Bn, &Nn) Use the following guidelines for your Courier type. V.Fast Class does not support synchronous mode. V.32 terbo modems If the modem is connecting with another U.S. Robotics V.32 terbo modem, set both modems to B0 and to a variable connection rate, &N0[...]

COURIER HIGH SPEED MODEMS F- 12 Synchronous Operations The fixed rate options are as follows: &N0 Variable rate &N6 9600 bps &N1 Reserved &N7 12K bps &N2 1200 bps &N8 14.4K bps &N3 2400 bps &N9 16.8K bps &N4 4800 bps ( terbo − to − terbo only) &N5 7200 bps &N10 19.2K bps ( terbo − to − terbo only)[...]

COURIER HIGH SPEED MODEMS Synchronous Operations F- 13 3. Set the voice/data switch to option 9, so that the modem executes the stored command string when you press the switch. Type the following: ATS32 = 9 <Enter> NOTE: If you usually use the voice/data switch for another purpose, you can include the execute stored command option (S32 = 9) i[...]

COURIER HIGH SPEED MODEMS F- 14 Synchronous Operations Hanging Up The modem remains online until the remote modem disconnects or your software causes the DTE to drop the Data Terminal Ready signal (DTR). The Courier sends the NO CARRIER result code if result codes are enabled, and returns to asynchronous Command mode. Testing and Inquiry Commands T[...]

COURIER HIGH SPEED MODEMS Dedicated and Leased Line Operations F- 15 DEDICATED AND LEASED LINE OPERATIONS The following operations apply in installations where the modem's phone line is not part of a public-access switched telephone network. Instead, the modem is connected to a special user-installed telephone line or a line that is leased fro[...]

COURIER HIGH SPEED MODEMS F- 16 Dedicated and Leased Line Operations Set the modem as follows: 1. Set your terminal or communications software to the rate at which you want the modems to communicate. For example, use a terminal/software setting of 19.2K bps and, if both modems have the capability, they will connect at 14.4K bps. The following instr[...]

COURIER HIGH SPEED MODEMS Dedicated and Leased Line Operations F- 17 3. Set the modem to load NVRAM settings at power-on, DIP switch 10 OFF. It does not matter if the modem is in Dumb or Smart mode (DIP switch 8). 4. Decide which modem is to be the calling modem and which the answering modem. Set the answering modem to Auto Answer, DIP switch 5 OFF[...]

COURIER HIGH SPEED MODEMS Additional Operations G- 1 APPENDIX G. ADDITIONAL OPERATIONS CONTENTS HST Cellular Voice/Data (External Modems Only) Hewlett Packard 3000 Installations MI/MIC Operations (External Modems Only)[...]

COURIER HIGH SPEED MODEMS G- 2 Additional Operations CELLULAR OPERATIONS This function applies to Dual Standard HSTs only. HST cellular modems can be used to answer or originate calls, but are proprietary. They can only connect with other U.S. Robotics Dual Standard modems with HST cellular capabilities. To enable cellular mode, load the &F3 te[...]

COURIER HIGH SPEED MODEMS Additional Operations G- 3 The modem uses the U.S. Robotics proprietary HST cellular protocol to make connections. The call starts at 1200 bps, a V.42 error control connection is negotiated, then the modem switches to 4800 bps and begins measuring the line conditions. Depending on line conditions, the modem decreases or in[...]

COURIER HIGH SPEED MODEMS G- 4 Additional Operations VOICE/DATA (EXTERNAL MODEMS ONLY) The voice/data switch is located on the modem's front panel. While the switch's primary function is to toggle back and forth between voice and data communications, this feature also allows you to perform other functions at the touch of a switch. Use Reg[...]

COURIER HIGH SPEED MODEMS Additional Operations G- 5 Voice/Data Switch  S32=1, S32=2 1. Phone the other user to establish the bit rate, parity, word length and number of Stop bits the other person's modem accepts. (Both modems should be offline, in Command mode.) You and the other user must also agree on which modem will go off hook in Orig[...]

COURIER HIGH SPEED MODEMS G- 6 Additional Operations Software Commands  ATD, ATA If your voice/data switch is set for a function other than voice/data operations and you don't wish to change it, use AT commands. 1. Call the other user to establish the bit rate, parity, word length and number of Stop bits the other person's modem accept[...]

COURIER HIGH SPEED MODEMS Additional Operations G- 7 ALLOWABLE VOICE/DATA SWITCH FUNCTIONS Use Register S32 to set the voice/data switch for the function you desire. The default is S32=1  pressing the switch forces the modem off hook in Originate mode. Pressing the switch when you power on the modem causes it to perform a power-on self- test. Se[...]

COURIER HIGH SPEED MODEMS G- 8 Additional Operations HEWLETT PACKARD INSTALLATIONS During error control connections, the Courier recognizes the ASCII ENQ/ACK characters exchanged between many Hewlett Packard host computers and their terminals. The HP host sends the terminal an ENQ character at predefined intervals, and sends no more data until the [...]

COURIER HIGH SPEED MODEMS Additional Operations G- 9 MI/MIC OPERATIONS (EXTERNAL MODEMS ONLY) DESCRIPTION Mode Indicate/Mode Indicate Common (MI/MIC) closure is required by some installations whose existing hardware does the dialing. The modems do not Auto Dial. In these situations, the modem must be forced off hook in Originate mode. This is done [...]

COURIER HIGH SPEED MODEMS G- 10 Additional Operations 6. Locate the voice/data switch at the front of the modem. Lift up and remove the modem (printed circuit board), carefully easing the voice/data switch out of its opening in the front panel. 7. Turn the modem rightside up and locate jumper switches J4 and J6, near the power-adapter socket. Use F[...]

COURIER HIGH SPEED MODEMS Additional Operations G- 11 10. Connect the modem's RS-232, power and phone cables, in that order (see chapter 2). Be sure the phone cable is plugged into the jack closest to the center of the modem  the jack represented by the wall jack icon on the case bottom label. CAUTION: When you power on the modem there will[...]

COURIER HIGH SPEED MODEMS G- 12 Additional Operations 2. Replace the modem in the case top: ease the voice/data switch into the opening in the front panel and make sure the back of the board rests on the locator pins at the rear (from which you removed the screws). 3. Reconnect the modem's RS-232, power and phone cables, in that order. Be sure[...]

COURIER HIGH SPEED MODEMS Modem Testing H- 1 APPENDIX H. MODEM TESTING Testing is available with the &T command or Register S16. All loopback testing conforms to ITU-T Recommendation V.54. Earlier U.S. Robotics high speed modems, however, did not perform the &T test repertoire. Only one test can be performed at a given time. If you send a t[...]

COURIER HIGH SPEED MODEMS H- 2 Modem Testing ANALOG LOOPBACK  &T1, &T8 This test checks the operation of the modem's transmit ter and receiver. Data flow is shown in Figure H-1. Figure H-1   Data Flow During Analog Loopback There are two analog loop back options. The first, &T1, involves your typing data that you can verif[...]

COURIER HIGH SPEED MODEMS Modem Testing H- 3 4. Type recognizable data so that you can verify it when it is looped back to the screen. 5. End the test. If you set S18, the modem automati cally stops the test at the timeout, exits AL mode and responds OK. If you didn't set Register S18, wait one second and type +++ to bring the modem back to Co[...]

COURIER HIGH SPEED MODEMS H- 4 Modem Testing 3. Send the modem the following command: AT &M0 &T8 <Enter> The modem disables error control and enters AL mode. The MR status light flashes. The modem sends its internal test pattern to the trans mitter, and loops the pattern back to the receiver. You will not see any data on your screen. [...]

COURIER HIGH SPEED MODEMS Modem Testing H- 5 NOTE: This test requires the modem to establish a connection and return to online-command mode in response to the +++ escape code. DIP switch 9 must be set ON so that the modem does not hang up on receipt of the escape code. After you change the switch, issue ATZ to the modem to initiate the new setting.[...]

COURIER HIGH SPEED MODEMS H- 6 Modem Testing REMOTE DIGITAL LOOPBACK  &T6, &T7 This test, like the local digital loopback test, verifies the condition of both modems and the phone link. Data flow is shown in Figure H-3. Figure H-3   Data Flow During Remote Digital Loopback The request for and granting of Remote Digi tal Loopback te[...]

COURIER HIGH SPEED MODEMS Modem Testing H- 7 2. Bring the Modem back to Command mode with the +++ escape code. Send it the AT&T6 command. The modem enters RDL mode and the MR status light flashes. 3. Type a short message. It will be looped back to your modem by the remote modem and to your screen for verification. (The remote user will not see [...]

COURIER HIGH SPEED MODEMS H- 8 Modem Testing 2. Brin g the modem back to Command mode with the +++ escape code. Then send it the AT&T7 com mand. The modem enters RDL mode and the MR status light flashes. The modem sends its internal test pat tern to the remote modem, which loops it back to your modem. You will not see the data on your screen. 3[...]

COURIER HIGH SPEED MODEMS Modem Testing H- 9 NOTE: Earlier U.S. Robotics modems require bit 3 to be enabled in order to grant RDL to a remote modem. The modem now requires its default &T4 setting instead. To perform RDL with a U.S. Robotics modem that does not use the &T test repertoire, that modem should be set to S16=8 before it can grant[...]

COURIER HIGH SPEED MODEMS H- 10 Modem Testing TEST PATTERN  S16=4 The test pattern can be used instead of your typed data during Analog Loopback (AL) or Remote Digital Loop back (RDL), using &T commands or S16. The test pattern is available at all speeds. At 300 bps, the modem's serial port rate must be fixed (&B1) and the link rate[...]

COURIER HIGH SPEED MODEMS Modem Testing H- 11 Initiating Modem 1. If DIP switch 9 is OFF, set it ON so that it does not hang up on receipt of the +++ escape code. Issue an ATZ command to initiate the new switch setting. 2. Set the software to 2400 or 1200 bps. The ITU-T-specified RDL signals are defined only for connections at 2400 or 1200 bps. 3. [...]

COURIER HIGH SPEED MODEMS H- 12 Modem Testing Keep in mind, however, that error control is disabled. Because error control is negotiated during the con nection sequence, its status cannot be changed until the modem is back on hook and in Command mode.[...]

COURIER HIGH SPEED MODEMS Software Upgrades I- 1 APPENDIX I. SOFTWARE UPGRADES The Courier V.34 modem is software upgradable. You can download upgrades from the USR Bulletin Board Service (BBS) to obtain maintenance fixes or new features. We suggest you retain a copy of the most recent upgrade on disk so you can download it to your modem again, sho[...]

COURIER HIGH SPEED MODEMS I- 2 Software Upgrades 5. Answer the download prompts according to your system requirements. The file will be downloaded to the directory specified in your communications software. 6. When the file transfer is complete and you are ready to leave the BBS, type G ( Goodbye ) from the main menu. Upgrade your Modem NOTE: Your [...]

COURIER HIGH SPEED MODEMS Software Upgrades I- 3 /b= n Enter this command to specify the bit rate at which the COM port will communicate with the modem. Valid entries for n are 9600, 19200, 38400, 57600, and 115200. The default is 57600 bps. /q This command allows you to shut off most of the screen display as the program upgrades your modem code fo[...]

COURIER HIGH SPEED MODEMS Glossary J- 1 APPENDIX J. GLOSSARY Cross-references in the following definitions are printed in boldface. Adaptive Speed Leveling (ASL) Courier V.32 bis and V.32 terbo modems detect improved line conditions and shift upward again to the next higher speed. The modems at both ends of the connection adapt independently, each [...]

COURIER HIGH SPEED MODEMS J- 2 Glossary ASCII American Standard Code for Information Interchange. A 7 -bit binary code (0's, 1's) used to represent letters, numbers, and special characters such as $, !, and /. Supported by almost every computer and terminal manufacturer. Asymmetrical Modulation A duplex transmission technique which splits[...]

COURIER HIGH SPEED MODEMS Glossary J- 3 Bisync Binary Synchronous Control. An earlier protocol developed by IBM for software applications and communicating devices operating in synchronous environments. The protocol defines operations at the link level of communications, for example, the format of data frames exchanged between modems over a phone l[...]

COURIER HIGH SPEED MODEMS J- 4 Glossary Carrier A continuous frequency capable of being either modulated or impressed with another information-carrying signal. Carriers are generated and maintained by modems via the trans mission lines of the telephone companies. CCITT Formerly, an international organization that defined standards for tele graphic [...]

COURIER HIGH SPEED MODEMS Glossary J- 5 Cyclic Redundancy Checking (CRC) An error-detection technique consisting of a cyclic algorithm performed on each block or frame of data by both sending and receiving modems. The sending modem inserts the results of its computation in each data block in the form of a CRC code. The receiving modem compares its [...]

COURIER HIGH SPEED MODEMS J- 6 Glossary Dedicated Line A user-installed telephone line used to connect a specified num - ber of computers or terminals within a limited area, for example, one building. The line is a cable rather than a public- access tele phone line. The communications channel may also be referred to as nonswitched because calls do [...]

COURIER HIGH SPEED MODEMS Glossary J- 7 Error Control Various techniques which check the reliability of characters ( parity ) or blocks of data. V.42, MNP and HST error control protocols use error detection ( CRC ) and retransmission of errored frames ( ARQ ). Facsimile A method for transmitting the image on a printed page from one point to another[...]

COURIER HIGH SPEED MODEMS J- 8 Glossary HDLC High Level Data Link Control. A standard protocol devel oped by the International Standards Organization for soft ware appli - cations and communicating devices operating in synchronous environments. The protocol defines oper ations at the link level of communications, for example, the format of data fra[...]

COURIER HIGH SPEED MODEMS Glossary J- 9 Local Echo A modem feature that enables the modem to send copies of key - board commands and transmitted data to the screen. When the modem is in Command mode (not online to another system) the local echo is invoked through the ATE1 command. The com - mand causes the modem to display your typed commands. When[...]

COURIER HIGH SPEED MODEMS J- 10 Glossary Nonvolatile Memory (NVRAM) User-programmable random access memory whose data is retained when modem power is turned off. Used in Courier modems to store a user-defined default configu ration loaded into random access memory ( RAM ) at power on. OFF/ON Hook Modem operations which are the equivalent of manuall[...]

COURIER HIGH SPEED MODEMS Glossary J- 11 Protocol A system of rules and procedures governing communications between two or more devices. Protocols vary, but communi - cating devices must follow the same protocol in order to exchange data. The format of the data, readiness to receive or send, error detection and error correction are some of the oper[...]

COURIER HIGH SPEED MODEMS J- 12 Glossary Start/Stop Bits The signaling bits attached to a character before the character is transmitted during Asynchronous Transmission . SDLC Synchronous Data Link Control. A protocol developed by IBM for software applications and communicating devices operating in IBM's Systems Network Architecture (SNA). The[...]

COURIER HIGH SPEED MODEMS Glossary J- 13 Throughput The amount of actual user data transmitted per second with out the overhead of protocol information such as Start and Stop bits or frame headers and trailers. Compare characters per second . Transmission Rate Same as Bit Rate . V.17 An ITU-T standard for facsimile operations that specifies modulat[...]

COURIER HIGH SPEED MODEMS J- 14 Glossary V.25 An ITU-T standard for modem communications. Among other things, V.25 specifies an answer tone different from the Bell answer tone. All U.S. Robotics modems can be set with the B0 command so that they use the V.25 2100 Hz tone when answer - ing overseas calls. V.25 bis An ITU-T standard for synchronous c[...]

COURIER HIGH SPEED MODEMS Glossary J- 15 V.34 An ITU-T standard that allows data rates as high as 28.8K bps. V.42 An ITU-T standard for modem communications that defines a two-stage process of detection and negotiation for LAPM error control. V.42 bis An extension of ITU-T V.42 that defines a specific data com - pression scheme for use with V.42 er[...]

COURIER HIGH SPEED MODEMS T echnical Specifications K- 1 APPENDIX K. TECHNICAL SPECIFICATIONS Your modem uses multiple standard modulation protocols and is also compatible with many nonstandard schemes. V.34 28.8K, 26.4K, 24K, 21.6K, 19.2K, 16.8K, 14.4K, 12K, 9600, 7200, 4800, and 2400 bps asynchronous Trellis Coded Modulation (TCM) V.Fast Class (V[...]

COURIER HIGH SPEED MODEMS K- 2 Technical Specifications Additional Compatibility Features ITU-T V.32, 9600 bps, synchronous, asynchronous, Trellis Coded Modulation (TCM); 4800 bps, synchronous, asynchronous, Quadrature Amplitude Modulation (QAM) ITU-T V.25 2100 Hz tone ITU-T V.23, 1200 bps, asymmetrical (1200/75 bps), Frequency Shift Keying (FSK) I[...]

COURIER HIGH SPEED MODEMS T echnical Specifications K- 3 Fax Standards The Courier modem provides Group III-compatibility when combined with Class 1 or Class 2.0 fax software. In addition, the modem adheres to the following standards. TIA/EIA-578 Service Class 1 Asynchronous Facsimile DCE Control Standard TIA/EIA-592 Service Class 2.0 Asynchronous [...]

COURIER HIGH SPEED MODEMS K- 4 Technical Specifications DATA FORMAT Binary, serial; defaults to 8-bit word length, no parity, and 1 stop bit Word Parity Stop Length (1 Bit) Bits 7 Even, Odd 1 Mark, Space 7 None 2 8 None 1 FRONT PANEL STATUS LIGHTS HS High Speed (above 2400 bps) AA Auto Answer/Answer CD Carrier Detect OH Off Hook RD Received Data SD[...]

COURIER HIGH SPEED MODEMS T echnical Specifications K- 5 TEST OPTIONS Analog loopback with test pattern Remote digital loopback Digital loopback Test pattern Dial test CALL PROGRESS CODES FAX DATA NO DIAL TONE BUSY NO ANSWER RINGING VOICE FAILED CALL TIMEOUT 60-sec. default, programmable 2-255 sec. ANSWER TONE TIMEOUT 60 sec. FAX SERVICE CLASS 1 CO[...]

COURIER HIGH SPEED MODEMS K- 6 Technical Specifications FAX SERVICE CLASS 2.0 COMMANDS Class 2.0 fax commands are too numerous to be listed here. For information on Class 2.0 technical specifications, contact Global Engineering Documents, at 1-800-854-7179. The document that covers this information is: ANSI/EIA/TIA-592-1993 (EIA-592) Asynchronous F[...]

COURIER HIGH SPEED MODEMS T echnical Specifications K- 7 Commands and Result Codes not supported: Call request with identification number (CRI); Program identifier (PRI); Request list of identification numbers (RLI); List of delayed call numbers (RLD). ANSWER TONE DETECTOR 2200-2300 Hz LOSS OF CARRIER (DISCONNECT TIMER) 0.7-sec. default, programmab[...]

COURIER HIGH SPEED MODEMS K- 8 Technical Specifications Originate Mode: 1875 Hz Answer Mode: 1875 Hz Originate Mode: 1920 Hz Answer Mode: 1920 Hz USR-V.32 terbo /V.32 bis /V.32 Originate Mode: 1800 Hz Answer Mode: 1800 Hz USR-HST, 450 bps back channel Originate Mode: 375 Hz Answer Mode: 1800 Hz USR-HST, 300 bps back channel Originate Mode: 350 Hz A[...]

COURIER HIGH SPEED MODEMS T echnical Specifications K- 9 V.21 Originate Mode: Mark: 980 Hz Space: 1180 Hz Answer Mode: Mark: 1650 Hz Space: 1850 Hz RECEIVER CARRIER FREQUENCIES V.34 Originate Mode: 1800 Hz Answer Mode: 1800 Hz Originate Mode: 1829 Hz Answer Mode: 1829 Hz Originate Mode: 1867 Hz Answer Mode: 1867 Hz Originate Mode: 1920 Hz Answer Mo[...]

COURIER HIGH SPEED MODEMS K- 10 Technical Specifications USR-V.32 terbo /V.32 bis /V.32 Originate Mode: 1800 Hz Answer Mode: 1800 Hz USR-V.32 terbo /V.32 bis /V.32 Originate Mode: 1800 Hz Answer Mode: 1800 Hz USR-HST, 450 bps back channel Originate Mode: 1800 Hz Answer Mode: 375 Hz USR-HST, 300 bps back channel Originate Mode: 1800 Hz Answer Mode: [...]

COURIER HIGH SPEED MODEMS T echnical Specifications K- 11 V.21 Originate Mode: Mark: 1650 Hz Space: 1850 Hz Answer Mode: Mark: 980 Hz Space: 1180 Hz RECEIVE SENSITIVITY - 44 dBm + 2 dBm TRANSMIT LEVEL - 9 dBm maximum TRANSMITTER FREQUENCY TOLERANCE .01% CERTIFICATION FCC Part 68 and Part 15, Class B Domestic; IC (Canada), UL listed POWER CONSUMPTIO[...]

COURIER HIGH SPEED MODEMS Index 1 INDEX Command List Bold entries indicate primary references . +++, return to Command mode, 4-10 , C-2 +FAA, Call Detection, 5-4 +FCLASS= n , Fax/Data mode, 5-2 +FCLASS?, display mode, 5-2 >, repeat, 4-7 , C-3 /, pause, 4-5 , C-5 $, basic command help, 6-8–6-11 &$, ampersand command help, 6-9 &A, enable[...]

COURIER HIGH SPEED MODEMS 2 Index A AA, see LEDs ACK character, HP installations, 2-4, 4-28, G-8 Adapter, Card (synchronous), F-10 Phone, See RJ11C Power, 2-2 Adaptive dialing (X n ), 4-6, 4-15, 4-16 Adaptive Speed Leveling, 1-2, A-2–A-3 Advanced result code subsets (&A), 4-17–4-8 Ampersand (&) commands, C-9–C-17 Analog loopback (AL) [...]

COURIER HIGH SPEED MODEMS Index 3 Call progress messages, 1-4 see also OK, CONNECT, RING, NO CARRIER, ERROR, NO DIAL TONE, BUSY, and NO ANSWER Call Detection, 5-4 Call Indicate (CI) defined, J-3 disable (S45), B-27 Call waiting (S10), B-17 Canada, see Industry Canada Cancel dialing, 4-6 Carriage return, ASCII definition (S3), B-14 Carrier, defined,[...]

COURIER HIGH SPEED MODEMS 4 Index Data Set Ready (DSR, &S), 4-24 Data Terminal Ready (DTR), 2-6 operations (&D), 4-23–4-24, C-10 DCE, J-5 Dedicated lines, Appendix F Defaults DIP switches, B-7–B-8 NVRAM/factory, B-9 NVRAM S-Register options, B-14 setting, 4-11–4-12 Department of Communication, see Industry Canada Detection phase (V.42[...]

COURIER HIGH SPEED MODEMS Index 5 Escape code (+++), 4-10, C-2 changing ASCII definition (S2), 4-10, B-14 guard time (S12), B-14 see DIP switch 9 .EXE files, A-7 Expansion slot, 3-7 Extended commands, 6-9 Extensions, transferring calls to (!), 4-5 Extra stepup, 6-6 F Facsimile, see Fax Operations Factory settings, see DIP switches and NVRAM templat[...]

COURIER HIGH SPEED MODEMS 6 Index International calls, 4-30 B0, 4-19, C-4 &G, 4-30, C-11 &P, 4-31, C-14 V.21 (S27), B-21 V.23 (S34), B-24 Interrupts, 3-4 IRQs, see Interrupts ITU-T See V.17 , V.21 , V.25 , V.25 bis , V.27 ter , V.29 , V.32 , V.32 bis , V.34 , V.42 , V.42 bis , V.54 J Jumpers, 3-5 K Kermit protocol, A-7 L LAPM disable (S27),[...]

COURIER HIGH SPEED MODEMS Index 7 Online, command mode, 4-10, C-2 local echo, 4-13 fallback, A-3 return, 4-11 Operational requirements, Chapters 2 and 3 Originate mode, 4-6 Overheating, 2-1 Overseas calls, 4-30 see International calls P Parity, J-10 Party lines, x Passwords, Appendix D Pause (,), 4-4 (/), 4-5 (W), 4-5 dial (S8), B-14 Percent (%) co[...]

COURIER HIGH SPEED MODEMS 8 Index RS-232, connectors, 2-2 description, B-2 PIN assignments, B-3 requirements, B-4 RTS (&R), see Request to Send See DIP switch 1 See DIP switch 6 signal operations, 4-23–4-24 synchronous requirements, F-2 RTS/CTS delay, 4-27, (S26) B-14, C-14 S SABME, 6-5 DS, see LEDs SDLC, J-12 SDL.EXE, Appendix I Security, se[...]

COURIER HIGH SPEED MODEMS Index 9 Tone dialing, 4-4, C-4 recognition (%T), 4-31, C-20 timing, spacing, duration (S11), B-14 TR, see LEDs Transfer a call (!), 4-4 Transmission rate, connection rate (&N), 4-22–4-23 serial port rate (&B), 4-21–4-22 synchronous interface (%N), F-4–F-5 Transmit data flow control (&H), 4-26 Transmitter,[...]

COURIER HIGH SPEED MODEMS 10 Index X Xmodem-type protocols, 4-25, 4-29 XID, 6-6 XON/XOFF, 4-25, 4-28 character assignments (S22 and S23), B-14, B-20 Y Ymodem, A-8 Ymodem-G, A-8 Z .ZIP file, A-6 Zmodem, A-8[...]