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Paradyne 3980-A2-GZ40-20 manual

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Table of contents for the manual

  • Page 1

    1 3980-A2-GZ40-20 November 1996 COMSPHERE 3800 Plus Modems Synchronous Data Compression Feature Document Number 3980-A2-GZ40-20 November 1996 Overview The Paradyne proprietary Synchronous Data Compression (SDC) feature allows an increase of throughput in data transmission, and has an error correcting procedure so that transmitted data is less sensi[...]

  • Page 2

    2 November 1996 3980-A2-GZ40-20 SYNCHRONOUS DTE INTERCHANGE CIRCUITS FUNCTION D ATA COMPRESSION FUNCTION ERROR CORRECTION FUNCTION SIGNAL CONVERTER LINE CONTROL FUNCTION DCE 495-14785 Figure 2. Synchronous Data Compression Installing the SDC Feature The SDC feature can be installed using A T commands or the DCP . Installing the SDC Feature Using th[...]

  • Page 3

    3 3980-A2-GZ40-20 November 1996 10. Perform a power reset: • For a standalone modem, turn the Power switch to the Off position, then to the ON position, or • For a carrier-mounted modem, release the lock, slide the modem part of the way out of the carrier , then replace it and lock it in place. 1 1. Set the SDC configuration options suitable fo[...]

  • Page 4

    4 November 1996 3980-A2-GZ40-20 SDC User Interface When SDC is enabled, the following configuration options are available to set up the SDC feature. Some of the configuration options are not displayed unless SDC is enabled. V .42/MNP/Buffer (see T able 1) • Sync Comp Mode • SDC Negotiation • SDC Idle Fill • SDC Bit Encoding • Sync DTE CRC[...]

  • Page 5

    5 3980-A2-GZ40-20 November 1996 T able 1 (1 of 3) V .42/MNP/Buffer Configuration Options for SDC Sync Comp Mode: DirectMode Nxt DirectMode HDLC/SDLC This configuration option only appears if Async/Sync Mode is configured for Sync. Synchronous Compression Mode. Enables and disables synchronous data compression. DirectMode – Disables the Synchronou[...]

  • Page 6

    6 November 1996 3980-A2-GZ40-20 T able 1 (2 of 3) V .42/MNP/Buffer Configuration Options for SDC SyncDTE CRC: Ignore Nxt Ignore CRC16 This configuration option only appears when the Async/Sync Mode configuration option is set to Sync and Sync Comp Mode configuration option is not set to DirectMode. Synchronous DTE CRC. Determines whether the CRC of[...]

  • Page 7

    7 3980-A2-GZ40-20 November 1996 T able 1 (3 of 3) V .42/MNP/Buffer Configuration Options for SDC TXBuffDiscDelay: 10sec Nxt 10sec Disable 60sec This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode is not configured for DirectMode, or when Async/Sync Mode is configured for Sync and Sync Comp Mod[...]

  • Page 8

    8 November 1996 3980-A2-GZ40-20 T able 2 DTE Interface Configuration Options for SDC Sync DTE Rate: 128000 Nxt 128000 1 15200 1 12000 96000 76800 72000 64000 57600 56000 48000 38400 28800 19200 14400 9600 4800 2400 1200 This configuration option does not appear when: • Async/Sync Mode configuration option is set to Async. • Sync Comp Mode confi[...]

  • Page 9

    9 3980-A2-GZ40-20 November 1996 T able 3 A T Commands for SDC AT Command Description DCP LCD Command Sequence #DM n SDC Delay Minimization. Minimizes the delay introduced by SDC by allowing the modem to transmit a DTE frame to its DTE in a discontinuous way . #DM0 No delay minimization. The modem does not begin transmitting a frame to its DTE until[...]

  • Page 10

    10 November 1996 3980-A2-GZ40-20 T able 4 (1 of 2) S-Registers for SDC S-Register Description DCP LCD Command Sequence S28 SDC Negotiation. Controls negotiation between two modems attempting to connect using SDC. Register has the following values: 0 = LAPM_Buffer 1 = LAPM_Discon The factory setting is LAPM_Buffer . ConfigureEdit V42/MNP/Buffer S2[...]

  • Page 11

    11 3980-A2-GZ40-20 November 1996 T able 4 (2 of 2) S-Registers for SDC S-Register DCP LCD Command Sequence Description S31 SDC Bit Encoding. Determines the type of bit encoding used when transmitting synchronous DTE data. Register has the following values: 0 = NRZ 1 = NRZI The factory setting is NRZ. ConfigureEdit V42/MNP/Buffer S32 SyncDTE CRC. [...]

  • Page 12

    12 November 1996 3980-A2-GZ40-20 Synchronous Data Format The SDC feature supports the High-level Data Link Control (HDLC) and Synchronous Data Link Control (SDLC) type protocols for synchronous DTE data. An HDLC frame is composed of an information field containing the data to transmit, plus an overhead (address, control, and FCS fields) used by the[...]

  • Page 13

    13 3980-A2-GZ40-20 November 1996 Data Synchronization Data exchanged between the synchronous DTE and the modem is synchronized by two clock signals. Data coming from the DTE is synchronized by the transmit clock and data received by the DTE is synchronized by the receive clock. The transmit clock is provided by the modem on circuit 1 14 or by the s[...]

  • Page 14

    14 November 1996 3980-A2-GZ40-20 Flow Control Method The data transmitted from the DTE is sent to the DCE at a rate determined by the transmit clock frequency . When SDC is active, this data is then compressed in the DCE and sent to the remote DCE at the line rate less than the rate between the DTE and DCE (usually twice, three, or four times less)[...]

  • Page 15

    15 3980-A2-GZ40-20 November 1996 T able 5 SDC Negotiation Configuration Scenarios Originating Modem Answering Modem Negotiation Results SDC enabled with LAPM_Buffer negotiation. SDC enabled. SDC connection. SDC enabled with LAPM_Discon negotiation. SDC enabled. SDC connection. SDC enabled with LAPM_Buffer negotiation. SDC disabled. Buffer mode conn[...]

  • Page 16

    16 November 1996 3980-A2-GZ40-20 Both groups have DTE Rate, Compression Ratio, and Line Efficiency measurements. Each measurement is an average of the last ten seconds’ data, and is updated every second. See T able 6. T able 6 SDC Performance Measurements Group DTE Rate Compression Ratio Line Efficiency TX The number of bits per second received f[...]

  • Page 17

    17 3980-A2-GZ40-20 November 1996 Modem Configuration There are also configuration options in the V42/MNP/Buffer branch of the 3800 Plus modem which affect SDC efficiency . (LAPM) Max Frame Size. Except in environments where line impairments are known to be unusually high, set this to the maximum (256). Sync DTE CRC. If the CRC type of the DTE frame[...]

  • Page 18

    18 November 1996 3980-A2-GZ40-20 2. SOFTW ARE USE a. The Software (1) shall be disabled or deleted when no longer used in accordance with this License Agreement, or when the right to use the software is terminated; and (2) shall not be removed from a country in which use is licensed. 3. TERM This license is effective until terminated. Y ou may term[...]