Paradyneメーカー3980-A2-GZ40-20の使用説明書/サービス説明書
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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 Compres.
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 .
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.
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.
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.
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.
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 M.
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.
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 .
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 .
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.
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.
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.
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 .
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.
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.
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).
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.
デバイスParadyne 3980-A2-GZ40-20の購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
Paradyne 3980-A2-GZ40-20をまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはParadyne 3980-A2-GZ40-20の技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Paradyne 3980-A2-GZ40-20の取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Paradyne 3980-A2-GZ40-20で得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Paradyne 3980-A2-GZ40-20を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はParadyne 3980-A2-GZ40-20の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Paradyne 3980-A2-GZ40-20に関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちParadyne 3980-A2-GZ40-20デバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
