Chapter Protocols, Reliable Mode | Black Box 3600 MODEM specs

Chapter 6

Protocols

CCITT V.42 bis Error Control Protocol

V.42 bis is an industry standard for error control adopted by the Consultative Committee for International Telephone and Telegraph (CCITT). The CCITT V.42 bis protocol incorporates two error control algorithms, LAPM and MNP. LAPM is a CCITT Link Access Protocol family member related to LAPB and LAPD, currently in use in other communications applications. MNP is Microcom Networking Protocol, which has become an industry standard by the large number of its users.

The use of V.42 bis requires both local and remote modems to be V.42 bis compatible. Error control protocol is transparent to the user and requires no special hardware or software. Data to be transmitted is put in a buffer so the modem can retransmit it if an error occurs. The modem also buffers data received from the remote modem in case an error occurs and the data is retransmitted. To avoid overfilling the buffer, flow control is used to control data between the modem and the terminal. V.42 bis protocol options can be set byAT commands.

Note

Error control protocols are only valid when using asynchronous DTE options.

Reliable Mode

When an LAPM or MNP link is established, the modem is in reliable mode. V.42 bis allows negotiation with a remote modem to the highest level of protocol common to both units. Both LAPM and MNP control data errors by retransmitting any block of data that was corrupted in transit. LAPM is assigned highest priority, and, if not supported, then an MNP connection is attempted.

Modem 3600

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Black Box 3600 MODEM manual Chapter Protocols, Ccitt V.42 bis Error Control Protocol, Reliable Mode

Contents

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Power-UpOption Selection Autodialing from Front Panel Autodialing from a Terminal with the AT CommandsPlacing a Call Dialing with a Standard Telephone Ending a Call Answering a Call Reasons for Call Terminatio n Condition Reasons for Call Termination Reasons for Call Termination Condition Page LED Descriptions Chapter Front Panel Operation LCD Menu Operation LCD Menus Reg LCD Menu Option Selectio n Main Menu Submenu Submenu Item Option Com Reg LCD Menu Option Selection Submenu Main Menu Option Com Reg Lease line only † Dial line only Modify Change DTE Speed DTE=DCE Modify Change DTE Dial Method Async Modify Change DTE RTS/CTS Delay Password of 0000 disables front panel security Front Panel Security Front Panel Operation Command Categories Chapter AT CommandsOperation Modes Offline Command Mode Sending Commands to the ModemOnline Command Mode Autobaud Guidelines for Creating Command Statements Creating a Command Statement AT Backspace Key Command Statement BufferRepeating a Command a Monitor Display Numbered Commands Response CommandsGroup Commands Negotiation Displays W Command OperationDigit / Word Selection Response Displays Q Call Progress / Connect Speed Messages Number Code Application *RC Command Code Set Number Operation Code Message Meaning Response Number Codes / Messages DTE rate 31200 bps Connect 300/V42 Connect 300/MNP5 Dialing D Dial Commands Wait for Second Dial Tone W Tone Dialing TPulse Dialing P Insert Long Pause Wait for 5 Seconds of Silence @ Switching to Answer Mode after Dialing RRemaining in Command Mode Hook Flash Voice Calls Switching from Voice to DataDialing a Stored Telephone Number Sn Autodial Number Location *AUn Caller ID *ID AT Command Answer aManual Answer Autoanswer S0 Caller ID Message s Modem sends this message Distinctive Ring *DR Data Carrier Detect &C Terminal Interface Commands Data Terminal Ready &D Data Set Ready &S Request to Send / Clear to Send &R Serial Port Ring Indicator Pin 22 \R Local Character Echo E General CommandsChanging from Data Mode to Command Mode +++ DTE Controlled Fallback Rate Pin 23 *FB Hanging Up H, H1 Online Character Echo FFast Disconnect H2, H3 Eprom Check Speaker Volume LSpeaker Control M Bis Guard Tones &G Asynchronous / Synchronous Mode Selection &MReturn Online O Long Space Disconnect Y Make / Break Dial Pulse Ratio &P Modulation *MM Synchronous Transmit Clock Source &XRate Selection Thresholds *TH Asymmetric Bit Rates *AS Maximum DCE Speed %B Minimum DCE Speed %L Automatic Rate Adaption %R Auto Retrain %E Product Revision Level %V Manual Rate Adaption *RR Fast Train *FT Online Quick Reference $HProduct Serial Number $V Talk / Data *DA Dial Line Transmit Level *TDn Disable AT Command Set *NTWire Operation Private Line Operation Wire Dial-up Operation Wire Leased Line Operation Dial Backup Dial / Leased Line &L Dial Backup *DBReturn to Leased Line from Dial Backup *LB Manual Dial Backup *LD Stored Profile Configuration CommandsConfiguration Profiles Active Profile Powerup Option Set &Y Storing a Configuration &W Load Factory Options &Fn Reset to Stored Configuration Z Storing a Telephone Command Line &Zx=n, *CNx,n, *ND View Configuration Profiles/Received Signal Options &V Soft Download Password %P1, $Y Remote ConfigurationRetaining / Restoring Options *RO Remote Security Code %P= Remote Configuration Security Enabling/Disabling Remote Configuration *RA Entering Remote Configuration %T=, &T Remote Configuration Format *RF Remote Configuration DTE Speed *RB Remote Configuration Saving or Discarding Options *RQ Page Reliable Mode Ccitt V.42 bis Error Control ProtocolChapter Protocols Data Compression Auto-Reliable ModeNormal Mode Constant Speed Interface Protocol Commands Direct ModeFlow Control Disconnect Buffer Delay %D Serial Port DTE Constant Speed \J Optional Detection Phase \M Auto-Reliable Fallback Character %An Operating Mode \N Serial Port Flow Control \Q Data Link Flow Control \G XON/XOFF Pass Through \X Break Control \Kn Inactivity Timer \T Transmit Break / Set Break Length \B Maximum Reliable Block Size \ASet Auto-Reliable Buffer \C 42bis Data Compression %C Diagnostic Test s Offline Online Chapter Test Mode OperationTest Categories Terminating a Test in Progress &T Test Commands Operation Local Analog Loopback &T1 Testing the Local Modem Local Analog with Test Pattern Local Analog Loopback with Self Test &T8 Local Digital Loopback &T3 Testing the Remote Modem Remote Digital Loopback &T6 Grant/Deny RDL Request &T4, &T5 Test Pattern %T Remote Digital Loopback with Self Test &T7 DTE Controlled Local Analog Loopback Pin 18 *LA DTE Controlled Remote Digital Loopback Pin 21 *RD Autocallback Security Chapter Security Remote Operation Low Security OperationOperating without Low Security Operating with Low Security LCD Indication of Security Low Security CommandsPasswords Local Operation High Security Security Levels Superuser Disabling High Security $D High Security CommandsDefault Passwords Enabling High Security $EH=pw Set Security Levels $Ln=m Setting Passwords $Pn=pw$pwSet User Callback Number $Cn=m Display Extended Feature Status $W? Extended Features $WDisplay / Reset Illegal Access Attempt Counters $M, $Mn, $M Display User Status $S? Factory Reset $F=pw$pwRemoving a User $Rn Security Status $E? Verify User Information $In, $IBn Local Logon Command $n=pwLocal Logoff Command $$ Remote Logon Procedure $n=pw Security Fax Operation Chapter Fax Operation Modem Initialization Fax DefaultsFax Autoanswer Class 1 Details Fax Associated OptionsStored Fax Profile Dial Command D Class 1 Commands On Hook H Answer Command a Class 0 Operation +FCLASS=0 Service Class Indication +FCLASS?Service Class Capabilities +FCLASS=? Off Hook H1 Fax Transmit and Receive Modes Receive Silence +FRS=TimeValues for Fax Modulatio n Modulation Speed Facsimile Receive +FRM=Mod Facsimile Transmit +FTM=ModValues for Fax Modulation Speed Hdlc Receive +FRH=Mod Hdlc Transmit +FTH=ModTest Supported Range of Values +FTx=?, +FRx=? Fax Autoanswer +FAA= Class 1 Result Code +FCERRORCommand Description Binary File Transfer Registers Chapter Status Registers Changing S-Register Values Changing Register Values Sn=v, Sn=v Register Operation Sn?, Sn? Ring Count S1 Individual Bit Command Sn . # =v Backspace Character S5 Escape Character S2End-of-Line Character S3 Line-Feed Character S4 Dtmf Tone Duration S11 Pause Interval for Comma S8Carrier Detect Time S9 Lost Carrier Detect Time S10 S15 Bit Value Command DescriptionS13 Bit Mapped S14 S19 Test Timeout S18System Tests S16 S17 Comman Bit Value Description Bit Mapped S21 Bit Mapped S23 Bit Mapped S22S24 Bit Mapped S27 RTS/CTS Delay S26Lookback Timer S28 DTR State Recognition S25 S31 Bit Value CommandBit Mapped S29 Bit Mapped S30 S33 DTR / Dial Backup Number to Dial S35Remote Configuration Escape Character S41 Bit Mapped S32 Xoff Character from DTE S45 Remote Configuration Guard Time S42S43 XON Character from DTE S44 Automatic Rate Adaption Threshold S53 Leased Line Transmit Level S52 S55 \Q3 Enable bilateral CTS/RTS flow controlDisable modem port flow control Flow Control S54 Compression Control S56 Inactivity Timer S58Bit Mapped S57 101 \K5 Break option Break Control S59 Bit Mapped S60 Enable auto retrainMNP compression enabled Disable auto-reliable data buffer S65-66 Disconnect Buffer Delay S62Maximum Transmit Block Size S63 Auto-Reliable Fallback Character S64 S68 Link Speed Status S67 10010 B18 33,600 bps DCE Independent Speed S69 111 \N7 Lapm or MNP or native auto Reliable Operating Mode S70Operating Mode Status S71 \M1 Enable V.42 fast detect Callback Retry S75 Password Timeout S73Callback Delay S74 Bit Mapped S72 Break Length S79 Callback Retry Delay S76Autocallback Timer S78 Lockout Threshold S77 Serial Port or DTE Speed S80 Negotiation Status S82 00001 DisabledEnable negotiation status Minimum DCE Speed S81 Modulation Type S88 Enable any key abortBit Mapped S84 S85-S87 S92 S94 Current Modulation S91 S98- S100 Settings S95Asymmetric Settings S96 Bit Mapped S97 Chapter Bis Autodialer Software Guidelines Autodialer Command Strings and Parameters Invalid Responses Dial Parameters Bis Commands and ResponsesParameters Function Program Number Command PRN ann...n Dial Command CRN nn...n Sepacall progress messages Intermediate Call Progress ResponseDial Stored Number CRS a CNX@nnnnnBPS LSNann...nsepann...n Request List of Stored Numbers RLNDisregard Incoming Call DIC EtbsysystxLSNsp Seprcall progress messages Connect Incoming Call CICRedial Last Number CRR n Link Number by Address PRL ab Request List of Linked Numbers RLL LSLalsepal Modem Options Command PRO xxxyy00Request List of Version RLV EtbspspstxLSLsp Modem 11-11 Restore Factory Settings PRP n Save Current Settings PRK Request List of Stored Options RLO xxx yy Options V.25 Autodialer Options Definition Settings Default Modem 11-15 Ebcdic Ascii Modem 11-17 Test Bilateral Commanded Loop General Chapter MaintenanceFuse Replacement Maintenance Calling Technical Support Size Appendix a Specifications Modulation Speed Modem Data Rates Carrier Detect Level Page Pin Function Appendix B Phone Jack DescriptionsPage Jumper Option Selection Appendix C Hardware Options Figure C-1. Cover Removal Figure C-2. Jumper Location for Ground Option Replacing the Cover Fault Isolation Procedure Appendix D Fault Isolation Procedure Part Modem and Telephone Line Check Modem Page Command Reg Description Appendix E Command Index and Defaults Wait for 2nd dial tone S7 value Command Reg Description Restore factory configuration 1 † EBCDIC, NRZ1 Command Reg Description Command Reg Description Command Reg Description BER Command Reg Description DCE Switches modem to talk mode † Command Reg Description Command Reg Description Command Description Fax Command Description ValueModulationSpeed High Security Command Description Low Security †cannot be executed from remote configuration mode Modem Remote Configuration Commands Data bits, mark parity, 1 stop bit Reg Function Factory Set Default RO=Read only RW=Read or write Modem Default Synchronous Description Command Bis Dialer Commands Synchronous Description Command Response Message Meaning Response Messages INC Modem Options DCE rate 33600 Modulation automode Asynchronous Dial-up with V.42 bis Protocol AT&F or AT&F1Dial Line Options Tone dial Asynchronous Dial-up without V.42 bis Protocol AT&F2 Factory Option Set # Factory Option Set #3 Modem Options DCE rate Synchronous 4-wire Leased Line AT&F4 Factory Option Set #5 Asynchronous 4-wire Leased Line withV.42bis Protocol AT&F5 Factory Option Set # Synchronous 2-wire Leased Line Normal Originate AT&F7 Synchronous 2-wire Leased Line Forced Answer AT&F8 Synchronous V.25bis Dialer AT&F9 Factory Option Set #9 Appendix F Ascii and Ebcdic Characters NUL ESC ET end of transmission ACK0 DEL Hardware Options Hardware Options Hardware Options Hardware Options Appendix G Abbreviations and Acronyms Abbreviations and Acronyms PBX Xmit What You Need Appendix H Flash Upgrade Troubleshooting Service and Support Page Index Index-2V.3600 3600Index-3 Index-4V.3600 3600Index-5 Index-6V.3600 3600Index-7 Index Index-8V.3600