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Multitech SocketModem MT2456SMI-22 Developer's Manual

Embedded modem serial interface
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MT2456SMI–22
Serial Interface
Developer's Guide

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Summary of Contents for Multitech SocketModem MT2456SMI-22

  • Page 1 SocketModem Ô Embedded Modem MT2456SMI–22 Serial Interface Developer’s Guide...
  • Page 2 Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes. Revisions...

  • Page 3: Table Of Contents

    Appendix A – Test/Demo Card Information...47 Block Diagram...47 Appendix B - Product Approvals, Compliance, and Layout Considerations ...48 Product Safety and EMC Approvals...48 Regulatory Design Considerations...49 SocketModem Placement ...51 Compliance ...52 Index ...57 Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Contents...

  • Page 4: Chapter 1 - Product Description And Specifications

    The MT2456SMI SocketModem is a standard 64-pin modem used for integrating data communications. It is a single-port 5V or 3.3V modem that integrates a modem controller, DSP, and DAA in a 1" x 2.5" form factor and communicates to a host controller via an asynchronous serial interface.

  • Page 5: Technical Specifications

    Line-in-use detection during on-hook operation Extension pickup detection Call waiting detection Caller ID (US configuration only) DTMF detection autodial, redial pulse or tone dial auto answer call status display Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Chapter 1 – Product Description and Specifications...

  • Page 6: Chapter 2 - Mechanical Specifications

    Chapter 2 - Mechanical Specifications Chapter 2 – Mechanical Specifications Physical Dimensions Figure 2–1. Maximum Component Height Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide...

  • Page 7: Pin Configurations

    DTE. Modem response take priority over incoming data. When no data is transmitted, the signal is held in mark condition. Transmit Data. The DTE uses this line to send data to the modem for –TXD transmission over the telephone line or to transmit commands to the modem.
  • Page 8 Ring Indicate. –RI output ON (low) indicates the presence of an ON segment of a ring signal on the telephone line. The modem will not go off-hook when – RI is active; the modem waits for –RI to go inactive before going off-hook.

  • Page 9: Chapter 3 - Electrical Characteristics

    Although input protection circuitry has been incorporated into the devices to minimize the effect of this static buildup, proper precautions should be taken to avoid exposure to electrostatic discharge during handling and mounting. Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Chapter 3 - Electrical Characteristics = 3.6 V VDDMAX = 5.25 V...

  • Page 10: Chapter 4 - V.22Bis Commands, S-Registers, And Result Codes

    Display Blacklisted Numbers Display Delayed Numbers -STE Set Telephony Extension +PCW Call Waiting Enable +VDR Distinctive Ring Modulation Control Commands Modulation Selection Enable/Disable Line Quality Monitor ITU-T or Bell Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Chapter 4 - V.22bis Commands...
  • Page 11 You may notice that some commands are available but do not support any function. These commands exist for compatibility purposes only. If you enter these commands, you may receive an OK result; however, no changes are made to the configuration or control of the modem. Examples of these commands are: Y, &S, &V1, +VDT, and \A, Multi-Tech Systems, Inc.

  • Page 12: V.22Bis Generic Modem Control Commands

    <pmode> Decimal number corresponding to the selected option. 0 Reports Caller ID with formatted presentation to the DTE. The modem presents the data items in a <Tag><Value> pair format. The expected pairs are date, time, name, and caller code (telephone number).
  • Page 13 Malaysia 6C South Africa 9F Default If the modem is specified for use in only one country, that country code is the default. Otherwise, the default is defined by the OEM. Factory default is B5 (United States). Reporting Current or Selected Values Command: +GCI? Response: +GCI: <current country_code>...
  • Page 14 Local Analog Loopback Test The modem will perform the local analog loopback test if &T1 is selected. The test can be run only when in an asynchronous operation in non-error-correction mode (normal), e.g., AT&Q6. To terminate the test in progress, the escape sequence must be entered first.

  • Page 15: V.22Bis Dte/Dce-Modem Interface Commands

    The parameters defined in this section control the operation of the interface between the DTE/DCE and modem. Command Echo The modem enables or disables the echo of characters to the DTE. The valid parameter value is written to S14 bit Syntax E<value>...
  • Page 16 Extended Result Codes This command selects the subset of the result code messages used by the modem to inform the DTE of the results of commands. Blind dialing is enabled or disabled by country parameters. If the user wishes to enforce dial tone detection, a "W"...
  • Page 17 3 DTR drop is interpreted according to the current &Qn setting as follows: &Q0, &Q1, &Q5, &Q6: DTR drop causes the modem to perform a soft reset as if the Z command were received. &Q2, &Q3: DTR drop causes the modem to hang up. Auto-answer is inhibited.
  • Page 18 This extended-format compound parameter controls the operation of local flow control between the DTE and the modem during the data state when V.42 error control is used, or when fallback to non-error control mode is specified to include buffering and flow control. It accepts two numeric subparameters.
  • Page 19 Entering and Exiting In Band Active State In Band Command mode will be active only when a modem connection has been made and DCD is on and the modem is not in command mode. Upon a data connection before the connect message is sent, an In Band message will be sent to the DTE to notify that all further data will be EM shielded and should be filtered.
  • Page 20 <length> is 27h corresponding to 27h-1Fh=8. This is the length of the sequence following the <length> octet. The modem responds to this command by transmitting the caller ID information to the DTE via the in-band sequence: EM <60h> <length> <62h> <raw caller ID information>...

  • Page 21: V.22Bis Call Control Commands

    The modem will wait for dial tone before dialing the digits following "W". If dial tone is not detected within the time specified by S7 (U.S.) or S6 (other countries), the modem will abort the rest of the sequence, return on-hook, and generate an error message.
  • Page 22 Set Tone Dial Default This command forces DTMF dialing until the next P dial modifier or P command is received. The modem will set an S-Parameter bit to indicate that all subsequent dialing should be conducted in tone mode. The DP command will override this command.
  • Page 23 OK <value> = 0 to 3 ERROR Otherwise &G Select Guard Tone This command causes the modem to generate the guard tone selected by this command (DPSK modulation modes only). The parameter value, if valid, is written to S23 bits 6 and 7. Syntax &G<value>...
  • Page 24 Display Blacklisted Numbers This command requests the modem to return a list of blacklisted numbers to the DTE. The format of the response is shown by the example below. Permanently forbidden numbers as defined by country requirements will not appear on this list.
  • Page 25 ERROR Otherwise Behavior in Data Mode When on-hook, if the line is in use and an ATDT is issued, the modem will not go off hook and will return with the message “LINE IN USE”. When off-hook and either an extension is picked up or a line reversal is detected, the modem will drop the connection.
  • Page 26 If the GSTN Cleardown is not received successfully by the remote modem, the remote modem may attempt a retrain until the retrain fails and the remote modem drops the line. In any case, the modem will send a NO CARRIER message to the DTE immediately after sending the GSTN Cleardown. A result code of 25 will be left in the S86 register.

  • Page 27: V.22Bis Modulation Control Commands

    Numeric values which specify the lowest (<min_rx_rate>) and highest (<max_rx_rate>) rate at which the modem may establish a receive connection. May be used to condition distinct limits for the receive direction as distinct from the transmit direction. Values for this subparameter are decimal encoded, in units of bit/s.
  • Page 28 Controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1). The parameter value, if valid, is written to S41 bits 2 and 6. If enabled, the modem attempts to retrain for a maximum of 30 seconds.

  • Page 29: V.22Bis Error Control And Data Compression Commands

    Transmit Break to Remote In non-error correction mode, the modem will transmit a break signal to the remote modem with a length in multiples of 100 ms according to parameter specified. If a number in excess of 9 is entered, 9 is used. The command works in conjunction with the \K command.
  • Page 30 Break Control Controls the response of the modem to a break received from the DTE or the remote modem or the \B command. The parameter value, if valid, is written to S40 bits 3, 4, and 5. Syntax \K<value> Defined Values <value>...

  • Page 31: V.22Bis Synchronous Access Mode Commands

    <nrzi_en> Specifies if Non Return to Zero Inverted (NRZI) encoding is to be used by the modem for transmit and receive data. The options are: 0 NZRI encoding and decoding disabled (default and fixed).
  • Page 32 (transmit data) from the DTE, to control the thresholds used for flow control of such data, and to control how often the modem reports to the DTE the number of octets in this buffer. The DTE can adjust its own thresholds for flow control of data on circuit 104 (received data) from the modem.

  • Page 33: V.22Bis Fastconnect Command

    V.22bis FastConnect Command Fast Connect Control This command allows configuring of the client modem to connect to a central site modem that supports non-standard V.22 and V.22bis Fast Connect protocols. Syntax $F<n> Defined Values <n> Decimal number which specifies the initial requested mode of operation when the modem is operating as the originator.

  • Page 34: V.22Bis Line Side Device Commands

    All thresholds are difference thresholds. Example: The line would be considered “in use” if the Tip & Ring Voltage dropped by 10.00 volts. Another Example: If the modem is off hook and the voltage drops by more than 2.50 volts, then the modem would consider the condition as an extension pick up.

  • Page 35: V.22Bis S-Parameters

    ATS=20 sets the contents of the last register accessed to 20. If the number "n" is outside the range of the S-Parameters available, the modem will return the ERROR message. If the value “v” is outside the range permitted for a given SParameter, the modem will return the ERROR message.
  • Page 36 General Bit-Mapped Options Status Call Failure Indication PSTN Transmit Attenuation Level Extended Result Codes Control * Default values may be modified using patch code. Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Chapter 4 - V.22bis Commands Range/Units Default* 0-255 rings...
  • Page 37 Range: 0-255 rings Default: 0 S1 - Ring Counter S1 is incremented each time the modem detects a ring signal on the telephone line. S1 is cleared if no rings occur over an eight second interval. Range: 0-255 rings Default: 0 S2 - Escape Character S2 holds the decimal value of the ASCII character used as the escape character.
  • Page 38 S10 - Lost Carrier To Hang Up Delay S10 sets the length of time (in tenths of a second) that the modem waits before hanging up after a loss of carrier. This allows for a temporary carrier loss without causing the local modem to disconnect. When register S10 is set to 255, the modem functions as if a carrier is always present.
  • Page 39 1 = &C1 selected. (Default) Bit 6 DSR behavior (&Sn). 0 = &S0 selected. (Default) 1 = &S1 selected. Bit 7 Long space disconnect (Yn). 0 = Y0. (Default) 1 = Y1. Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Chapter 4 - V.22bis Commands...
  • Page 40 S25 - Delay To DTR Off S25 sets the length of time that the modem will ignore DTR for taking the action specified by &Dn. Its units are seconds for synchronous modes and one hundredths of a second for other modes.
  • Page 41 S29 - Flash Dial Modifier Time S29 sets the length of time, in units of 10 ms, that the modem will go on-hook when it encounters the flash (!) dial modifier in the dial string. S29 is a country dependent parameter. The S29 value cannot be changed using S29=XX.
  • Page 42 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.
  • Page 43 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.
  • Page 44 Bit 1 Append/ARQ to CONNECT XXXX result code in error-correction mode (XXXX = rate). Bit 2-7 Reserved. Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Chapter 4 - V.22bis Commands mode, resulting in a transmit level from 0 to -15 PSTN...

  • Page 45: V.22Bis Result Codes

    V.22bis Result Codes The modem responds to commands from the DTE and to activity on the line by signaling to the DTE in the form of result codes. . Two forms of each result code are available: long-form, an English-like "verbose" response, and short-form, a data- like numeric response (included in parentheses following the long-form).
  • Page 46 The modem attempted to go off-hook when an extension was already occupying the line. CONNECT 33600 The modem has connected to the line, the DTE speed is 33600 bps and the DTE speed reporting is enabled. CONNECT 31200 The modem has connected to the line DTE speed is 31200 bps and the modem is to report the DTE speed upon connecting.

  • Page 47: Appendix A - Test/Demo Card Information

    Appendix A – Test/Demo Card Information Appendix A – Test/Demo Card Information Block Diagram Figure A–1. Serial Test/Demo Board Block Diagram Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide...

  • Page 48: Appendix B - Product Approvals, Compliance, And Layout Considerations

    While this device can be configured for specific country operation, doing so DOES NOT constitute country approval. This modem is not approved in or configured for operation in all countries. The following list is displays the country approvals as of April 1, 2003.

  • Page 49: Regulatory Design Considerations

    This section discusses hardware considerations, safety, and Telecom labeling requirements. Hardware Considerations Disclaimer: Multi-Tech Systems makes no warranty claims for vendor product recommendations listed below. Other vendor products may or may not operate satisfactorily. Multi-Tech System’s recommended vendor products only indicate that the product has been tested in controlled conditions and were found to perform satisfactorily.
  • Page 50 Notice: Even if the recommended design considerations are followed, there are no guarantees that a particular system will comply with all the necessary regulatory requirements. It is imperative that specific designs be completely evaluated by a qualified/recognized agency. Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide edition protection against over-voltage from power line...

  • Page 51: Socketmodem Placement

    Recommended Recommended Reference Reference Note: The analog to digital barrier is really a safety isolation barrier between TNV and SELV. Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Figure B–3. SocketModem Placement Description Generic Motherboard RICHCO DLMSPM-4-01 Support Post (L=.250”) RICHCO MSPM-4-01 Support Post (L=.250”)

  • Page 52: Compliance

    If trouble is experienced with this equipment, please contact Multi-Tech Systems, Inc. at the address shown below for details of how to have the repairs made. If the equipment is causing harm to the telephone network, the telephone company may request that you disconnect the equipment until the problem is resolved.
  • Page 53 Appendix B – Product Approvals, Regulatory Design Considerations, Compliance No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void registration and warranty. If your home has specially wired alarm equipment connected to the telephone line, ensure the installation of this equipment does not disable your alarm equipment.
  • Page 54 The letter height must be no less than 1.5 mm and the letters must be legible without magnification. (b) For integrated devices, e.g. a modem or one that is intended to become a sub-assembly of host equipment e.g. a data terminal, computer etc. that are designed to interface directly with the network, the certification/registration number shall be affixed to the integrated device itself.

  • Page 55: New Zealand Telecom Warning Notice

    Immediately disconnect this equipment should it become physically damaged, and arrange for its disposal or repair. This modem shall not be used in any manner which could constitute a nuisance to other Telecom customers. This device is equipped with pulse dialing, while the Telecom standard is DTMF tone dialing. There is no guarantee that Telecom lines will always continue to support pulse dialing.

  • Page 56: International Modem Restrictions

    Some dialing and answering defaults and restrictions may vary for international modems. Changing settings may cause a modem to become non-compliant with national telecom requirements in specific countries. Also note that some software packages may have features or lack restrictions that may cause the modem to become non- compliant.

  • Page 57: Index

    Approvals, 48 Safety considerations, 50 Serial Demo Board block diagram, 47 South African Statement, Regulations, 56 Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide Index Specifications,Mechanical, 6 Specifications,Technical, 5 –STE= - Set Telephony T - Set Tone Dial Default, 22 Table of Result...
  • Page 58 S23 - General Bit Mapped Options Status, 40 S24 - Sleep Inactivity Timer, 40 Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide S25 - Delay To DTR S26 - RTS to CTS S27 - Bit Mapped Options S28 - Bit Mapped Options...

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