Black Box 34336, MD885AE-R2 V.22 bis/V.22/V.21/V.23 Fallback, Rate Renegotiation Procedure RRP

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Modem 34336

 

Table 4-6. V.22 bis/V.22/V.21/V.23 FALLBACK.

 

 

 

MODE

 

DESCRIPTION

V.22 bis

 

2400 bps asynchronous/ synchronous

V.22

 

1200 and 600 bps asynchronous/synchronous

V.21

 

300 bps asynchronous

V.23

 

1200/75 bps asynchronous

 

 

 

All modes are full duplex.

The operating mode is controlled through the SPEED LIMIT screens on the LCD in all modes except Hayes mode. See Chapter 3 for details.

4.10.2V.32 SPEED FALLBACK

This feature applies only to V.32 mode operation. It functions only if enabled and the maximum speed is set (via the Speed Limit option) to the highest available speed—9600 bps for the Modem, 14,400 bps for the Modem.

When V.32 Speed Fallback is enabled, the Modem automatically selects the highest possible data rate, depending on the signal quality during handshake. The Modem automatically selects either 9600 bps or the fallback rate of 4800 bps. The Modem selects either 14,400 bps or the fallback rate of

12,000 bps. If the error rate is one error in 1000 bits or lower, the Modem connects at the highest available rate. If the error rate exceeds this threshold, the Modem connects at the fallback rate. Fallback may also occur during retrain sequences.

To configure the modem for automatic V.32 Speed Fallback, refer to Appendix C. Follow the instructions to change the value identified in the DATA PUMP OPTIONS diagram (Appendix C) as the V.32 Speed Fallback parameter from 1 (default setting) to 0.

Rate Renegotiation Procedure (RRP)

Rate Renegotiation Procedure (RRP) is a third type of automatic fallback; it can be controlled by the user.

Like V.32 Speed Fallback, RRP allows the Modem to automatically select the highest possible data rate, depending on the signal quality. Unlike Speed Fallback, RRP allows for data rate fallback or fallforward at any time during data trans-mission. Retraining is not required. RRP may be used with either dial- up lines or leased line operation.

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Contents Modem FCC Information Table of Contents Table of Contents Diagnostics Table of Conents Specifications Specifications Quick Start InstallationFor all applications Quick StartFor leased-line applications For dialup applicationsFront-Panel LCD and Controls Front-Panel LCD and ControlsCS = TR =MR = RS =Quick Setup V25 Dial Sync Available Quick Setup ConfigurationsDial Hayes V25 Dial AsyncQuick Setup 11 2-W Dial Quick Setup 12 2-W Dial V32/208 Quick Setup 07 2-W Leased ANSAT D 5551212 cr Basic OperationAT D 9,5551212 cr AT DP CRN Asynchronous V.25 bis OperationSynchronous V.25 bis Operation Pushbutton 1 Phone Pushbutton 2 Prog ENT Auto-Dial Failure Messages9600 6 2-WIREDIAL Bell 208 Operation Quick Setups 11 34/V.32 Dial Backup Slave-to-Master Inbound Transmission Problem Solving This page is intentionally left blank Methods For Selecting Options Modem Setup OptionsSelecting Options from the Front-Panel Setup Type Line Speed For Modem SETUPS. The first Options Modem Resultant Data RATE, bps SETTING, bpsModem 1 V.42 Error Correction Options Modem Modem Setup Options Modem Modem Setup Options Dialer Mode Data Format Options Modem See Section Remote Test Enable Disable Modem Setup Options Modem Setups Compromise Equalizers option is available for all modes Modem 8 V.33 and Bell 208A/B Options Options Accessible with Summary Setup only Modem Setup Options Modem Modem Setup Options Phone Number Storage Quick ResetGeneral Operation and Special Features Leased Line Auto-RecoveryCharacter Function Dialing Control CharactersDial Backup Dial Line Auto-Recovery AT &Z0=T555-4545/R DTR DialingDumb Mode And Bell 208 Operation TR MR RS CS Modem Security Operation Command Function EXAMPLE1 MEM.LOC.2 Password CommandsAT &Z1=/ASECURITY AT &Z5=/PYELLOW AT &Z0=/UCONNECTED Modem-Controlled Remote ControlControl Procedure Modem-to-Modem Control Procedure Using a Rack Controller General Operation and Special Features Remote control-address control mode Pin Function Diagnostic Interface ControlCommand Function Diagnostic Port CommandsConnect 003,022 CON 000003,22 Connect 3,22Address g,u Response Meaning ErrorDTE display Automatic Fallback Mode Description V.22 bis/BELL 212A/BELL 103 Fallback DefaultV.22 bis/V.22/V.21/V.23 Fallback Rate Renegotiation Procedure RRPRate Change Screen How to Enable or Disable RRP11 V.13 Operation Hayes Mode Autodialer Hayes Emulation ModeAT DT 9,212555-1234 or AT DT 9, 212 555 AT M2 V1 D 555-1212 S2=1OAT DT 9,555-1212 Exclamation FlashHayes Compatible Commands AT D3331234 AT D 555-1212 L5 AT S7=30 AT D9,3331234 Hayes Emulation Mode Registers AT S0=5 AT S0? S7?Modem Hayes Emulation Mode Selecting Options In Hayes Mode Hayes Mode Reference Tables Hayes Compatible Commands Forced On-Line Speaker VolumeProduct Code Or Checksum Speaker ControlWord/Digit Result Code Modify S RegisterRead S Register Tone DialingRecall Stored User Profile Forced Command StateRecall Factory Configuration Long-Space DisconnectRTS And CTS Options Asynchronous/Synchronous ModeData Set Ready Control Write Profile To Memory Test CommandsView Active Configuration, etc Default User ProfileMNP Class Limit Store Telephone NumberBuffer Mode/Speed Conversion \B1Hayes Compatible Commands Digit Code Word Code Meaning Hayes Mode Result Codes105 S Register Functions Register Range Units Default DescriptionEnabling The V.25 bis Autodialer V.25 bis AutodialerV.25 bis Autodialer Commands 109 CIC V.25 bis Autodialer CommandsC, D, #, V.25 bis Dialing ParametersSection V.25 bis Result Codes DTR Dialing In V.25 bis ModeDialing Parameters V.25 bis Result CodesSymptoms and Scope of The Problem When And Why To TestPhysical Inspection Overview Of Modem DiagnosticsDiagnostic Monitoring Status Screens How to Select and Activate Tests116 117 Analog Loopback Test Local Modem Diagnostics119 Analog Loopback Self-Test Albst External Analog Loopback Test Albx 122 External Analog Loopback Self Test Albst 124 Digital Loopback Test DLB Remote Digital Loopback Test RDL Remote Modem Diagnostics127 Remote Digital Loopback Self Test Pin Desig Function Source Nation IndicatorTable B-1. Quick Setup Configurations Appendix B Quick Setup ConfigurationsDumb LEASED2 Table B-1 . Quick Setup Configurations132 133 134 Introduction to Summary Setup Appendix C Summary SetupFigure C-1. How to access the Summary-Setup Screens Primary Options Setups ScreenDial Line Options Primary Options0 2 1 1 0 0 0 0 0 1 0 2 V42 1 V42Pump1 Pump2 Data Pump OptionsMisc1 Misc2 Miscellaneous OptionsAT Profiles AT Profiles ScreenFigure C-3. Changing the S Register Value REG ScreenAppendix D Jumpers Appendix D Jumpers Table D-1. Jumper Switch Functions NOM Statement 148 Copyright 1999. Black Box Corporation. All rights reserved
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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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