Multi-Tech Systems MT2456SMI22 S41 General Bit Mapped Options Status, S48 V.42 Negotiation Action

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Disable negotiation; bypass the detection and negotiation phases; and proceed with LAPM. Enable negotiation. (Default.)
Disable negotiation; bypass the detection and negotiation phases; and proceed at once with the fallback action specified in S36. Can be used to force MNP.

Chapter 4 - V.22bis Commands

S41 - General Bit Mapped Options Status

S41 indicates the status of command options.

Default: 13 (C3h) (00001101b)

Bits 0-1 Compression selection (%Cn).

0= Disabled (%C0).

1= MNP 5 (%C1).

2= V.42 bis (%C2).

3= MNP 5 and V.42 bis (%C3). (Default) Bits 2 Auto retrain (%En).

0= Retrain disabled (%E0).

1= Retrain enabled (%E1). (Default) Bit 3-7 Reserved.

S48 - V.42 Negotiation Action

The V.42 negotiation process determines the capabilities of the remote modem. However, when the capabilities of the remote modem are known and negotiation is unnecessary, this process can be bypassed if so desired. Range: 0, 7, or 128 If an invalid number is entered, it is accepted into the S-Register, but S48 will act as if 128 has been entered.

Default: 7 S48=0 S48=7 S48=128

S82 - Break Handling Options

Break Signals provide a way for the user to get the attention of the remote modem. The break type depends on the speed application. LAPM specifies three methods of break signal handling; in sequence, expedited, and destructive, If an in number is entered, it is accepted into the S register, but S82 will act as if the default value has been entered. Range: 3,7, or 128

Default: 128

S82 = 3 Expedited: Modem sends a break immediately; data integrity is maintained ahead of and after the break.

S82 = 7 Destructive: Modem sends a break immediately; data being processed by each modem at the time of the break is destroyed.

S82 =128 In sequence: Modem sends a break in sequence with any transmitted data; data integrity is maintained both ahead of and after the break (default)

S86 - Call Failure Reason Code

When the modem issues a NO CARRIER result code, a value is written to S86 Register to help determine the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message. Code definitions are: Range: 0-26

Default: 21

S86=0 Normal hangup, no error occurred.

S86=1 Reserved.

S86=2 Reserved.

S86=3 Call Waiting caused disconnect.

S86=4 Physical carrier loss.

S86=5 No error correction at the other end.

S86=6 No response to feature negotiation.

S86=7 This modem is async only; the other modem is sync only.

S86=8 No framing technique in common.

S86=9 No protocol in common.

S86=10 Bad response to feature negotiation.

S86=11 No sync information from the remote modem.

S86=12 Normal hangup initiated by the remote modem.

S86=13 Retransmission limit reached.

S86=14 Protocol violation occurred.

S86=15 Lost DTR.

S86=16 Received GSTN cleardown.

S86=17 Inactivity timeout.

S86=18 Speed not supported.

S86=19 Long space disconnect.

S86=20 Key abort disconnect.

S86=21 Clears previous disconnect reason.

S86=22 No connection established.

S86=23 Disconnect after three retrains.

S86=24 Call Waiting tone detected.

S86=25 Extension Pickup detected.

S86=26 Remote Hangup detected.

Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide

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Contents SocketModem Country By Email By Phone PN S000281A, Version aContents Product Description Product Description SpecificationsSpeed Conversion Technical SpecificationsMaximum Component Height Physical DimensionsPin Descriptions Pin Configurations3V DC Power Outputs Output High Output Low Handling Precautions3V and 5V Serial SocketModem Input High Input LowModulation Control Commands Generic Modem Control CommandsDTE/DCE Commands Call Control CommandsLine Side Device Commands Error Control and Data Compression CommandsSynchronous Access Mode Commands Fast Connect Command+VCID Caller ID CID 22bis Generic Modem Control CommandsSoft Reset and Restore Profile Operating ModeIdentification +GCI Country of InstallationLoad to Internal RAM Restore Factory Configuration ProfileProcedure Local Analog Loopback TestResult Code Form 22bis DTE/DCE-Modem Interface commandsCommand Echo Quiet Result Codes ControlExtended Result Codes Connect Ring No Carrier Error No Dial Tone Busy No AnswerDTR Option Short Form Long Form Value in ATXn CommandRlsd Option Result Codes OK 0 or\G Modem-to-Modem Flow Control XON/XOFF RTS/CTS Option+IFC DTE-Modem Local Flow Control Entering and Exiting In Band Active State +IBC In Band CommandsEM Shielding Data Supported DCE-to-DTE Commands Command Hex Codes Description Supported DTE-to-DCE CommandsBand Processing of AT Commands Dial 22bis Call Control CommandsDial Modifiers Speaker Volume Set Tone Dial DefaultResult Code Set Pulse Dial Default Return to On-Line Data ModeSelect Pulse Dial Make/Break Ratio Display Current Configuration and Stored ProfilesMSpeaker Control Select Guard ToneDisplay Blacklisted Numbers \V Single Line Connect Message EnableReport Line Signal Level Report Line Signal QualitySyntax *D Example Display Delayed NumbersNO. Phone Number -DELAY Behavior in Data ModeReporting Selected Values +PCW Call Waiting Enable+VDR Distinctive Ring Syntax 22bis Modulation Control CommandsTable of +MS Command Supported Rates +MS Modulation SelectionITU-T or Bell Enable/Disable Line Quality Monitor and Auto-Retrain\B Transmit Break to Remote 22bis Error Control and Data Compression Commands+ESR Selective Repeat +ETBM Call Termination Buffer ManagementBreak Control Result Codes OK 0 to 5 Error Otherwise+ESA? 22bis Synchronous Access Mode Commands+ESA Configure Synchronous Access Submode Reporting Selected Options+ITF? Transmit Flow Control Thresholds$F Fast Connect Control 22bis FastConnect CommandSyntax $Fn Defined Values Response 22bis Line Side Device CommandsThreshold Adjustments for Telephony Extension TRV Tip and Ring Voltage MeasurementRead/Write S-Parameter 22bis S-ParametersRegister Function Range/Units Default Summary of S-Parameter DefaultsAscii S3 Carriage Return Character S0 Number of Rings to Auto-AnswerS1 Ring Counter S2 Escape CharacterS9 Carrier Detect Response Time S8 Pause Time For Dial DelayS10 Lost Carrier To Hang Up Delay S12 Escape Prompt Delay EPDS21 V.24/General Bit Mapped Options Status S16 Test Mode Bit Mapped Options StatusS19 Reserved S20 ReservedS22 Speaker/Results Bit Mapped Options Status S24 Sleep Inactivity TimerS25 Delay To DTR Off S26 RTS to CTS DelayS29 Flash Dial Modifier Time S30 Disconnect Inactivity TimerS27 Bit Mapped Options Status S28 Bit Mapped Options StatusS39 Flow Control Bit Mapped Options Status S38 Delay Before Forced Hang UpS36 Lapm Failure Control S37 Desired Line Connection SpeedS86 Call Failure Reason Code S41 General Bit Mapped Options StatusS48 V.42 Negotiation Action S82 Break Handling OptionsS95 Extended Result Codes Control S91 Pstn Transmit Attenuation LevelConnect 22bis Result CodesTable of Result Code Definitions Code Message Meaning75TX/1200RX Is enabled Figure A-1. Serial Test/Demo Board Block Diagram Block DiagramMore planned Product Safety and EMC ApprovalsCountry Certifications Country Country CodeHardware Considerations Regulatory Design ConsiderationsSafety Qty Name Description SocketModem PlacementMulti-Tech Systems, Inc. Compliance ComplianceTelecom Requirements for the United States Label Physical Characteristics Label Content and FormatLabeling Continuity and Changes Telecommunications Regulations for CanadaOther Label Requirements Industry Canada New Zealand Telecom Warning NoticeInternational Modem Restrictions EMC, Safety, and R&TTE Directive ComplianceSouth African Statement Index Index
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