Paradyne 3980-A2-GZ40-20 - Manuals

Page 2 - Figure 2. Synchronous Data Compression; Installing the SDC Feature; Installing the SDC Feature Using the DCP

2 November 1996 3980-A2-GZ40-20 SYNCHRONOUS DTE INTERCHANGE CIRCUITS FUNCTION DATA 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 AT commands ...

Page 3 - Installing the SDC Feature Using AT Commands; To install SDC using AT commands, use this procedure.; The modem responds OK.; Menu Status and Result Codes

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, thenreplace it and lock it in place. 11. Se...

Page 4 - SDC User Interface

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 theconfiguration options are not displayed unless SDC is enabled. V.42/MNP/Buffer (see Table 1) • Sync Comp Mode • SDC Negotiation • SDC Idle F...

Page 5 - Table 1; DirectMode – Disables the Synchronous Data Compression mode.; not set to DirectMode.; not set to DirectMode.

5 3980-A2-GZ40-20 November 1996 Table 1 (1 of 3) V.42/MNP/Buffer Configuration Options for SDC Sync Comp Mode: DirectModeNxt DirectMode HDLC/SDLC This configuration option only appears if Async/Sync Mode is configured for Sync. Synchronous Compression Mode. Enables and disables synchronous data comp...

Page 7 - configured for DirectMode.; Comp Mode is; not configured for DirectMode.

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

Page 8 - This configuration option does not appear when:

8 November 1996 3980-A2-GZ40-20 Table 2 DTE Interface Configuration Options for SDC Sync DTE Rate: 128000Nxt 128000 115200 112000 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 opti...

Page 12 - Synchronous Data Format; Figure 3. Synchronous Data Format; SDC Algorithm

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 fieldcontaining the data to transmit, plus an overhea...

Page 13 - Data Synchronization; NOTE; Figure 4. Clocks at the DTE–DCE Interface

13 3980-A2-GZ40-20 November 1996 Data Synchronization Data exchanged between the synchronous DTE and the modem is synchronized by two clock signals. Datacoming from the DTE is synchronized by the transmit clock and data received by the DTE is synchronized by thereceive clock. The transmit clock is p...

Page 14 - Dictionary size parameter

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. WhenSDC is active, this data is then compressed in the DCE and sent to the remote DCE at the line rate less than therate between the DTE and...

Page 15 - Monitoring SDC Performance

15 3980-A2-GZ40-20 November 1996 Table 5 SDC Negotiation Configuration Scenarios Originating Modem Answering Modem Negotiation Results SDC enabled with LAPM_Buffernegotiation. SDC enabled. SDC connection. SDC enabled with LAPM_Disconnegotiation. SDC enabled. SDC connection. SDC enabled with LAPM_Buf...

Page 16 - Tuning SDC Efficiency; DTE Configuration

16 November 1996 3980-A2-GZ40-20 Both groups have DTE Rate, Compression Ratio, and Line Efficiency measurements. Each measurement is anaverage of the last ten seconds’ data, and is updated every second. See Table 6. Table 6 SDC Performance Measurements Group DTE Rate Compression Ratio Line Efficienc...

Page 17 - Modem Configuration; Software License Agreement; TITLE AND LICENSE GRANT

17 3980-A2-GZ40-20 November 1996 Modem Configuration There are also configuration options in the V42/MNP/Buffer branch of the 3800Plus modem which affect SDCefficiency. (LAPM) Max Frame Size. Except in environments where line impairments are known to be unusually high, setthis to the maximum (256). ...