INDEX A timeout, retransmit ACK character, HP maximum, 5-10, 8-4, installations, 4-6, B-16 4-11, E-11 with Auto Answer, 4- Adaptive dialing, 5- 6 8, 6-4 ASCII Adaptive Speed changing Leveling, ASL, 1-1 definitions, B-12 Advanced result code chart, B-21, subsets, 5-5ê5-6 Reference Card Analog loopback (AL) compatibility, 1-5 S16,F-8êF-9 Assembly, modem, 2- &T, F-2êF-3 4ê2-6 Answer mode RS-232 cable auto answer, 6-11ê6- requirements, 2- 12 2ê2-3, DIP switch 5, B-7 B-2êB-3 error control and, Asterisk, dialing 4-6 (*), 6-4 .ARC file transfer, Asymmetrical A-9 modulation, 3-1, G-1 ARQ (Automatic Repeat Asynchronous Request) transmission, 1-2, H- CONNECT result codes 1, (&A), G-2 5-5ê5-6 Audio monitor definition, 4-1, A- (speaker), 5-10 1, G-1 Auto answering, 6- disconnect reason 11ê6-12 (ATI6), 8-4 disabling, 6-12, B-7 during testing, App. number of rings on F which to answer flow control (S0), B-12 requirement, 3-2, with Dip switch 5, 4-4, 4-6 6-12, B-7 mode select (&M, Auto dialing, 6-3ê6-9 &D), 4-5, 4-17 Help screen (D$), 8- operations, A-7 8 stored phone B numbers, 8-6 Back channel, 4-2ê4- Automatic Repeat 3, H-1 Request, see ARQ forcing 300-bps, S15, B-15 Backspace key, ASCII definition (S5), B-12 Baud rate, G-2 Bisync, 7-1, G-2 Bits per second (bps) defined, G-2 link negotiation, 3- 5, 4-15, A-1êA-5 online fallback, 3- 6, A-1, A-4, A-5 rate recognition, 4- 13ê4-15, 6-1, E-5 setting the, 6-2 Break handling (&Y), 5-11 Break length, modem to terminal (S21), B-16 Buffers command, 6-8, 6-9 flow control, 4-6 Busy answer, 5-6ê5-7, 6-7ê6-8 C Calling another modem, 3-5, 6-3ê6-11 at another extension, E-8 at 110/300 bps, 4-16 at a fixed link rate, 4-15 overseas, 6-12ê6-13 Call duration reporting (K), 5-11 Call progress messages, 5-4ê5-8 Call waiting (S10), Commands B-13 Adaptive dialing Canadian (X2êX6), 5-8, 6-4 certification (DOC), Alphabetical xi, xiii, listing, App. C 6-9 Answer mode, 6-11 Carrier, defined, 5- ARQ mode select 10 (&M), 4-5 Carrier Detect (CD) Advanced ARQ result override (DIP switch code subsets (&A), 6, &C), 4-17ê4-18, B- 5-5ê-5-6 7 AT (attention), 2- CTS following, 4-7, 7ê2-8, 4-8, 4-9, B-5 Break handling (&Y), CCITT 5-11 answer tone (B, Cancel dialing (any V.32), 6-12ê6-13, key), 6-3 A-3êA-4 Carriage return defined, G-3 () V.21, 1-4 , 6-1, B- ASCII definition 17 (S3), B-12 V.25, 1-4, 6-1 to enter commands, V.32, 1-4, 6-1 2-8 V.32 bis, 1-4, 6-1 Carrier detect, CD V.42, 1-5, 6-1 (&C), 4-17ê4-18 V.42 bis, 1-5, 6-1, CCITT answer tone A-9 (B), 6-12ê6-13, V.54, 1-3, 1-5, 6-1, A-3êA-4 App. F Clock usage (K), 5- Channel, turnaround, 11 4-2ê4-3 Comma (pause), 6-4 Characters per second Command mode local (cps), A-9, G-3 echo (E), 2-8, 5-9 maximum throughput, Compression, data 4-3ê4-5, A-9 (&K), see data Clear to Send (CTS), compression 4-7, 4-8, 4-9, B-5 Data rate select Clock, Courier (K), DTE rate (&B), 4- 5-11 14ê4-15 Command format, 3-4, Link rate (&N), 4- 6-2 15ê4-16 Command mode local Data set ready, DSR echo (E), 2-8, 5-9 (&S), 4-16 Data terminal ready, S-register DTR (&D), 4-17, functions (S$), B-6 8-9 Dial (D), 3-5, 6-3 Inquiry options (I), last dialed number 8-1ê8-5 (DL), 6-8 call-duration letter strings (I3), 8-1 ("), 6-5 current settings Help screen (D$), display (I4), 8- 8-8 1, stored phone 8-2 number (DS), 8-6 link diagnostics Disable transmitter display (I6), 8-3 (C), 5-11 NRAM settings Disconnect (H, +++), display (I5), 8-2 6-9, 6-11 product Duplex, 5-9 configuration, 8- DTE/modem rate 5 select (&B), 4-13 Last dialed number Echo, local (E, F), (DL), 6-8 2-8, 5-9 Link rate select Error Control (&M), (&N), 4-15 4-5 Local echo (E, F), Escape code (+++), 2-8, 5-9 6-9 MNP mode select Factory settings, (&M), 4-5 loading (&F), 5-2 Online local echo Flow control (F), 2-8, 5-9 received data (&I, Pause (,), 6-4 &R), 4-9ê4-10 Percent commands, 4- transmit data 18 (&H), 4-7 Phone number storage Guard tone (&G), 6- (&Zn=s), 5-3 13 Pulse dial Hang up (H, +++), 6- make/break ratio 9ê6-11 (&P), 6-13 Help screens, using, Pulse/Touch-Tone 8-6 dial (P/T), 6-4 ampersand commands Punctuation, 6-3 (&$), 8-7 Quiet mode (Q), 5-4 basic commands RCU access (&R), 4- ($), 8-7 18 dialing (D$), 8-8 Receive only, Touch-Tone disable transmitter recognition (%T), (C), 4-18 5-11 Transfer call (!), Received data flow 6-6 control (&I, &R), Transmit data flow 4-9ê4-10 control (&H), Redial/re-execute 4-7ê4-8 previous command Verbal/numeric one time (A/), 6-8 response modes (V), continuous, (A>), 5-4 6-8 Wait for second dial Repeat, continuous tone (W), 6-5 (>), 6-8 Wait for answer (@), Reset to NRAM 6-6 defaults (Z), 5-3 Write to NRAM Response modes (V), modem settings 5-4 (&W), 5-1 Result code sets phone numbers (X), 5-6ê5-8 (&Zn=s), 5-3 Return online after Compatibility, 1-4ê1- +++ (O), 6-11 5, 6-1, H-1 Reverse frequencies error control, 4-5, (R), 6-7 A-5 Save in NRAM Compression, see Data modem settings compression (&W), 5-1 Components, 2-1 phone numbers Computer interface (&Zn=s), 5-3 (DTE) speed select Settings status (&B), 4-14 display Configuration, current settings general (I4), 8-1ê8-2 DIP switches, 2-6, NRAM settings B-6êB-8 (I5), 8-2 factory defaults, 5- Speaker control (M), 2, B-6êB-8 5-10 interface controls, S-register settings 4-1ê4-2 (Sr=n), App. B-5 internal controls, Summary, App. C 5-1 Testing (&T), App. F NRAM options, 5-10 Touch-Tone/pulse physical assembly,2- dial (P/T), 6-4 1ê2-3 S-registers, B-12êB- Data rate, 3-5, 4- 20 13ê4-16 Configuration to 300 and 110 bps call: calls, 4-16 at 110/300 bps, 4-16 asymmetrical, 1-1, HST-compatibles, 3- H-1 1, 4-2ê4-3 fixed/variable, 4-15 non-MNP compatibles, forcing 300-bps back 3-4, 6-3 channel (S15), B-15 V.32 bis- link negotiation, 3- compatibles, 4-2 5, 4-15, A-1êA-5 CONNECT messages, 5- online fallback, 3- 5ê5-6, 6-11, D-2, 6, A-1, A-4, A-5, E-5êE-7 E-5, H-3 ARQ (&A), 5-5 standards Connection rate, 3-5, compatibility, 1- 4-13ê4-16, 4ê1-5, App. A H-1 Connectors Data rate select (&B, requirements, 2-2 &N), 4-1ê4-16 physical assembly, Data Set Ready (DSR, 2-2 &S), 4-16 RS-232 interface Data Terminal Ready definitions, B-2, (DTR, DIP B-3 switch 1, &D), 4-17, CRC, cyclic B-6 redundancy checking, DCE, 4-1, G-4 A-5 Defaults CTS, 4-7, 4-8, 4-9, command summary, B-5 App. C Customer service, NRAM/factory, B-10 USRobotics, x, D-5 NRAM S-Register options, B-11 D setting, 5-1 Data compression Department of (&K), 1-1, 4-12, Communication (DOC), A-6êA-7 xi, xiii, 6-9 .ARC files, A-9 Detection phase, binary files, A-8, V.42, A-6 A-9 Diagnostics MNP5, disabling, 4- call/link (ATI6), 8- 12, A-9, B-18 3 Data format, 3-4ê3-5 testing, see Testing Dial, auto speed select (&B), at a glance, 3-5 3-2, 3-3, 3-4, 4-14 commands, functions, DTR, Data Terminal 6-3ê6-7 Ready, 4-17, D-1 stored phone number, dropping to force 6-7ê6-9 disconnect, 6-10 Dial test (S16), F-9 Dual Standard Modem, Dialing type ii, 3-1, 4-2, 5-6, 6- adaptive, 5-8, 6-4 1, 7-4, A-5 pulse/tone, 6-4 Dumb mode (DIP switch Digital signals, G-5 8), 2-9, B-7 DIP switches, 2-6, B- Duplex, Half/Full, 5- 6êB-8 9, G-5 auto answer, 6-11ê6- 12 E CD override, 4-17, Echo, local 2-8, 5-9 D-2 ENQ character, HP command set installations, 4-6, recognition, D-1 4-11, E-11 disconnect/hang up, Error control, see 6-10ê6-11 ARQ DTR override, 4-17, Error control, using, D-1 1-1, 4-5, 6-2 escape code ERROR message, 5-7, operations, 6-9ê6- 5-8 10 Escape code (+++), 6- load options, 5-2ê5- 9 3 changing ASCII local echo, 2-8, 5-9 definition (S2), B- result code display 12 (quiet mode), 2-9, to terminate 5-5, D-1 testing, App. F Result codes Extended result code verbal/numeric, 5- set, 5-5ê5-6, E-5 4, D-1 Extensions RS-232 DTE calling another, E-8 interface, 7-2, B-2 transferring calls Disconnecting (H, to (!), 6-6 +++), 6-9ê6-11 DOC, xi, xiii, 6-9 F DSR (&S), 4-16 Factory settings, 2- DTE, defined, 4-1, G- 6, 5-2ê5-3, App. B 5 Fallback, data rate link negotiation, 3- I 5, 4-15, A-1êA-5 Inactivity timeout online, 3-6, A-1, A- (S19), 1-3, B-16 4, A-5, E-5, H-3 Indicator lights, 2- disabling (S15), B- 4, B-4êB-5, F-1 15 Inquiry (I) options, FCC certification, 8-1ê8-5 xi, H-8 Installation, 2-4ê2-6 File transfer International calls, compressed files, 4- 6-12ê6-13 3, 4-12, A-9 B0, 6-12 protocols, 4-4, A-8 &G, 6-13 Fixed/variable data &P, 6-13 rates, 4-15 V.21 (S.27), 1-4, B- Flow control, 1-1, 3- 17 2, 4-6ê4-11, A-7 V.23, 1-4, B-19 Front Panel indicators, 2-4, B-4 K Full duplex, 5-9, G-6 Kermit protocol, 4-4, A-8 G Guard tone (&G), 6-13 L LAPM, 1-1, 4-5, A-6 H Leased line Half duplex, 5-9, G-6 installation, Handshaking, 6-12, operations (&L), App. A E-8êE-10 Hanging up (H, +++), LED displays, 2-4, B- 6-9ê6-11 4êB-5, F-1 HDLC, 7-1, G-6 Line feed, ASCII Hardware switches, definition (S4), B-12 see DIP switches Link diagnostics Help screens, list display (ATI6), 8-3 under Commands Link interface Hewlett Packard operations, 4-13ê4- installations, 4-6, 16, A-2, A-3, 4-11, A-5, E-11 speed select (&N), HST (High Speed 4-15 Technology), 3-1, Link rate 4-2ê4-3, 6-1, 7-4, 8- negotiation, 3-5 3, A-1 Load number, DOC, xiii Local echo, 2-8, 5-9 N Loopback tests, App. NO ANSWER result, 5- F 5ê5-6 Low speed calls, 4-3, NO CARRIER result, 5- 4-16 5ê5-6, 6-11, E-6êE-7 M NO DIAL TONE result, Manual, how to use, 5-5ê5-6 iiêiii Nonvolatile random Memory, modem access memory (NVRAM) nonvolatile random configuring, 5-1ê5- access (NVRAM), 3, B-8êB-9 5-1ê5-3, B-8êB-9 defined, 5-1, G-8 random access (RAM), DIP switch 10, B-7 8-1, G-9 options, B-9êB-11 read only (ROM), 8- resetting to (Z), 5- 1, G-9 3 MNP, Microcom storing phone Networking Protocol, numbers in (&Zn=s), error control, 1-1, 5-3 4-5, A-4, G-7 writing to (&W, data compression, A- &Zn=s), 5-1, 5-3 6êA-5, 4-12, A-6êA-7 O disabling, 4-12, A- OK message, 2-8, 5- 9, B-18 5ê5-6 Modem 110-bps calls, 4-16 defaults, App. B-2, Online local echo, 2- App. C 8, 5-9 defined, G-6 Online fallback, 3-6, installation, 2-2ê2- A-1, A-4, A-5, E-5, 6 H-3 problems and Operations solutions, App. D auto answer, 6-11ê6- repair, x, D-4 12 testing, App. F auto dial, 6-3ê6-9 Modulation error control, 4-5, compatibility, 1- 6-2 4ê1-5, 6-1, 7-3, H- flow control, 3-2, 1 4-6ê4-11, A-7 high speed, 4-2ê4-3, high speed, 4-2ê4-3, A-1êA-4, H-1 A-1êA-4 link negotiation, 3- etc.), 4-4, 5, 4-15 A-8 synchronous, Chapter synchronous, 7-1 7, B-3 Pulse dialing, 6-4 Originate mode, 6-7, E-2êE-4, E-9 Q Overseas calls, 6- Quiet mode, 5-4, D-2 12ê6-13, B-17, B-19 R P Rack Controller Unit Parity, 3-5, 6-2 Access (%R), 4-18 defined, G-8 Radio/television Party lines, xi interference, xii Pause during dial RAM, random access (,), 6-4 memory, 8-1, G-9 Percent commands, 4- Rate select commands 18 DTE rate (&B), 4-14 Phone company, link rate (&N), 4-15 connecting to, xi Received data flow Phone line interface, control (&I, &R), 2-5ê2-6, H-2 4-9ê4-11 dedicated or short Redial/re-execute line (&L), E-8 continuous (A>), 6-9 Phone number storage one time (A/), 6-8 (&Zn=s), 5-3 Remote digital inquiry, 8-6 loopback, F-5êF-7 Phone jacks Remote echo, 5-9 on Courier, 2-5 Repeat mode commands RJ11C, 2-1 (>, A>), Phone number storage 6-8ê6-9 (&Zn=s), 5-3 Request to send Placing a call, 3-5, (RTS), 4-9, B-5 6-3ê6-7 Requirements, Pound sign, dialing operating, 2-1ê2-3, (#), 6-4 3-1ê3-2 Problems and Reset to NRAM solutions, App. D defaults (Z), 5-3 Programming rate Result code sets, 5- switching, E-5êE-7 6ê5-7 Protocol Retrain sequence, 3- defined, G-9 6, 8-5, A-3, A-5, file transfer B-4, B-19 (Kermit, Xmodem, Retransmission, 4-1, RING result code, 5- Quad switch, B-8, D- 5ê5-6 2 RINGING result code, RTS (&R), 4-9, B-5 5-5ê5-6 synchronous calls, RJ11C jack, 2-1 7-2, 7-4, B-3 RMA (Return Materials Authorization) S number, x, D-5 SDLC, 7-1 ROM, read only Serial transmission, memory, 8-1, G-9 G-9 RS-232 interface, 2- Settings 2, B-2, B-3 changing, 4-2, 5-1 CD (DIP switch 6), default, 4-2, 5-1, B-7 B-9êB-11 connectors, B-2, B-3 Smart mode (DIP CTS (&H), 4-8, B-5 switch 8), B-7 DSR (&S), 4-16, D-1 Speaker (audio DTR (DIP switch 1), monitor), 5-10 7-4 Specifications, App. H Speed recognition, 4- 12, 6-1, App. E-2 Speed select DTE rate (&B), 3- 2ê3-4, 4-14 link rate (&N), 4-15 S-registers, 5-12, 8- 9, B-12êB-20 inquiries, 8-6 Standards Courier compatibility with, 1-4ê1-5, 6-1, H-1êH-2 RS-232, 2-2, B-2, B- 3 Star button, dialing (*), 6-4 Start/Stop bits, 3-5, 6-2 Store phone number (&Zn=s), 5-3 inquiry, 8-6 Switches, 2-3, 2-6, link interface (&N), B-6 4-15 Synchronous Transmit data flow operations, Chapter 7 control (&H), RS-232 requirements, 3-2ê3-4,4-7ê4-8 7-2, B-3 Trellis coded modulation, 1-2, H-1 T Technical U Specifications, App. Unattended operation, H see Auto Answer Technical Support, United Kingdom USRobotics, x, D-5 requirements Telephone company, CCITT answer connecting to, xi sequence (B), 6-12 Television/radio Guard tone enabled interference, xii (&G), 6-13 Terminal (DTE) Pulse dial interface speed make/break ratio select (&B), (&P), 6-13 3-2ê3-5, 4-14 Terminal Mode, 2-7, V G-10 V.xx, CCITT Hewlett Packard, 4- compatibility, 11, E-11 Glossary Terminology, 4-1, V.21, S27, 1-4, B-17, App. G H-2 Test pattern, F-9 V.22, 1-4, B-19, H-2 Testing, App. F V.23, 1-4, H-2 installation, 2-7ê2- V.25, 1-4, H-2 9 V.32 bis, 1-4, 4- Throughput, 4-3ê4-4, 2ê4-3, H-2 4-12, A-5êA-9 V.42 error control, Touch-tones 1-4, 4-5, A-6, H-2 dialing, 6-4 V.42 bis data timing, spacing compression, 1-4, 4- (S11), B-13 12, A-6 recognition (%T), 4- V.54, 1-4, F-1 18 Variable/fixed data Transmission rate, 4- rates 4, 4-13ê4-15, 6-1 DTE interface (&B), DTE interface (&B), 4-14 3-2ê3-4, 4-14 link interface (&N), 4-15 Voice/data communications configuring for, 2-3 using both, E-2êE-4 W Warranty information, x Word length, 3-5, 6- 2, H-3 X Xmodem-type protocols, 4-4, A-8 Y Ymodem, 4-4, A-8 Z Zmodem, 4-4, A-8