Multi-Tech Systems MT2456SMI22 manual S36 Lapm Failure Control, S37 Desired Line Connection Speed

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Chapter 4 - V.22bis Commands

S36 - LAPM Failure Control

Default: 7 (00000111b)

Bits 0-2 This value indicates what should happen upon a LAPM failure. These fallback options are initiated immediately upon connection if S48=128. If an invalid number is entered, the number is accepted into the register, but S36 will act as if the default value has been entered.

0 = Modem disconnects.

1 = Modem stays on-line and a Direct mode connection is established.

2 = Reserved.

3 = Modem stays on-line and a Normal mode connection is established.

4 = An MNP connection is attempted and if it fails, the modem disconnects.

5 = An MNP connection is attempted and if it fails, a Direct mode connection is established.

6 = Reserved.

7 = An MNP connection is attempted and if it fails, a Normal mode connection is established. (Default) Bits 3-7 Reserved

S37 - Desired Line Connection Speed

S37 specifies the desired line connection speed. Default: 0

Bits 0-3 Desired line connection speed. This is linked with the Fn command. If an invalid number is entered, the number is accepted into the register, but S37 will act as if the default value has been entered.

0 = Attempt automode connection (F0). (Default.)

1-3 = Attempt to connect at 300 bps (F1).

4 = Reserved.

5 = Attempt to connect at V.22 1200 bps (F4).

6 = Attempt to connect at V.22bis 2400 bps (F5).

7 = Attempt to connect at V.23 (F3). Bits 4-7 Reserved

S38 - Delay Before Forced Hang Up

S38 specifies the delay between the modem's receipt of the H command to disconnect (or ON-to-OFF transition of DTR if the modem is programmed to follow the signal), and the disconnect operation. Applicable to error-correction connection only. This parameter can be used to ensure that data in the modem buffer is sent before the modem disconnects.

1.If S38 is set to a value between 0 and 254, the modem will wait that number of seconds for the remote modem to acknowledge all data in the modem buffer before disconnecting. If time expires before all data is sent, the NO CARRIER result code will be issued to indicate that data has been lost. If all data is transmitted prior to time-out, the response to the H0 command will be OK.

2.If S38 is set to 255, the modem does not time-out and continues to attempt to deliver data in the buffer until the connection is lost or the data is delivered.

Range: 0-255 seconds

Default: 20

S39 - Flow Control Bit Mapped Options Status

Default: 3 (00000011b)

Bits 0-2 Status of command options. 0 = No flow control.

3= RTS/CTS (&K3). (Default)

4= XON/XOFF (&K4).

5= Transparent XON (&K5).

6= Both methods (&K6).

Bits 3-7 Reserved.

S40 - General Bit Mapped Options Status

S40 indicates the status of command options. Default: 104 (68h) (01101000b)

Bits 0-2 Reserved.

Bits 3-5 Break Handling (\Kn). 0 = \K0.

1 = \K1.

2 = \K2.

3 = \K3.

4 = \K4.

5 = \K5. (Default)

Bits 6-7 Reserved.

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

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Contents SocketModem PN S000281A, Version a Country By Email By PhoneContents Product Description Specifications Product DescriptionTechnical Specifications Speed ConversionPhysical Dimensions Maximum Component HeightPin Configurations Pin Descriptions3V DC Power Input High Input Low Handling Precautions3V and 5V Serial SocketModem Outputs Output High Output LowCall Control Commands Generic Modem Control CommandsDTE/DCE Commands Modulation Control CommandsFast Connect Command Error Control and Data Compression CommandsSynchronous Access Mode Commands Line Side Device CommandsOperating Mode 22bis Generic Modem Control CommandsSoft Reset and Restore Profile +VCID Caller ID CID+GCI Country of Installation IdentificationLocal Analog Loopback Test Restore Factory Configuration ProfileProcedure Load to Internal RAMQuiet Result Codes Control 22bis DTE/DCE-Modem Interface commandsCommand Echo Result Code FormConnect Ring No Carrier Error No Dial Tone Busy No Answer Extended Result CodesResult Codes OK 0 or Short Form Long Form Value in ATXn CommandRlsd Option DTR OptionRTS/CTS Option \G Modem-to-Modem Flow Control XON/XOFF+IFC DTE-Modem Local Flow Control +IBC In Band Commands Entering and Exiting In Band Active StateEM Shielding Data Command Hex Codes Description Supported DTE-to-DCE Commands Supported DCE-to-DTE CommandsBand Processing of AT Commands 22bis Call Control Commands DialDial Modifiers Return to On-Line Data Mode Set Tone Dial DefaultResult Code Set Pulse Dial Default Speaker VolumeSelect Guard Tone Display Current Configuration and Stored ProfilesMSpeaker Control Select Pulse Dial Make/Break RatioReport Line Signal Quality \V Single Line Connect Message EnableReport Line Signal Level Display Blacklisted NumbersBehavior in Data Mode Display Delayed NumbersNO. Phone Number -DELAY Syntax *D Example+PCW Call Waiting Enable Reporting Selected Values+VDR Distinctive Ring +MS Modulation Selection 22bis Modulation Control CommandsTable of +MS Command Supported Rates SyntaxEnable/Disable Line Quality Monitor and Auto-Retrain ITU-T or Bell+ETBM Call Termination Buffer Management 22bis Error Control and Data Compression Commands+ESR Selective Repeat \B Transmit Break to RemoteResult Codes OK 0 to 5 Error Otherwise Break ControlReporting Selected Options 22bis Synchronous Access Mode Commands+ESA Configure Synchronous Access Submode +ESA?Transmit Flow Control Thresholds +ITF?22bis FastConnect Command $F Fast Connect ControlSyntax $Fn Defined Values TRV Tip and Ring Voltage Measurement 22bis Line Side Device CommandsThreshold Adjustments for Telephony Extension Response22bis S-Parameters Read/Write S-ParameterSummary of S-Parameter Defaults Register Function Range/Units DefaultAscii S2 Escape Character S0 Number of Rings to Auto-AnswerS1 Ring Counter S3 Carriage Return CharacterS12 Escape Prompt Delay EPD S8 Pause Time For Dial DelayS10 Lost Carrier To Hang Up Delay S9 Carrier Detect Response TimeS20 Reserved S16 Test Mode Bit Mapped Options StatusS19 Reserved S21 V.24/General Bit Mapped Options StatusS26 RTS to CTS Delay S24 Sleep Inactivity TimerS25 Delay To DTR Off S22 Speaker/Results Bit Mapped Options StatusS28 Bit Mapped Options Status S30 Disconnect Inactivity TimerS27 Bit Mapped Options Status S29 Flash Dial Modifier TimeS37 Desired Line Connection Speed S38 Delay Before Forced Hang UpS36 Lapm Failure Control S39 Flow Control Bit Mapped Options StatusS82 Break Handling Options S41 General Bit Mapped Options StatusS48 V.42 Negotiation Action S86 Call Failure Reason CodeS91 Pstn Transmit Attenuation Level S95 Extended Result Codes ControlCode Message Meaning 22bis Result CodesTable of Result Code Definitions Connect75TX/1200RX Is enabled Block Diagram Figure A-1. Serial Test/Demo Board Block DiagramCountry Country Code Product Safety and EMC ApprovalsCountry Certifications More plannedRegulatory Design Considerations Hardware ConsiderationsSafety SocketModem Placement Qty Name DescriptionCompliance Multi-Tech Systems, Inc. ComplianceTelecom Requirements for the United States Label Content and Format Label Physical CharacteristicsTelecommunications Regulations for Canada Labeling Continuity and ChangesOther Label Requirements New Zealand Telecom Warning Notice Industry CanadaEMC, Safety, and R&TTE Directive Compliance International Modem RestrictionsSouth African Statement Index Index
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