Paradyne 3980-A2-GZ40-20 - Manual
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Table of Contents:
- Page 2 – Figure 2. Synchronous Data Compression; Installing the SDC Feature; Installing the SDC Feature Using the DCP
- 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
- Page 4 – SDC User Interface
- Page 5 – Table 1; DirectMode – Disables the Synchronous Data Compression mode.; not set to DirectMode.; not set to DirectMode.
- Page 7 – configured for DirectMode.; Comp Mode is; not configured for DirectMode.
- Page 8 – This configuration option does not appear when:
- Page 12 – Synchronous Data Format; Figure 3. Synchronous Data Format; SDC Algorithm
- Page 13 – Data Synchronization; NOTE; Figure 4. Clocks at the DTE–DCE Interface
- Page 14 – Dictionary size parameter
- Page 15 – Monitoring SDC Performance
- Page 16 – Tuning SDC Efficiency; DTE Configuration
- Page 17 – Modem Configuration; Software License Agreement; TITLE AND LICENSE GRANT
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 sensitive to channel
disturbances.
The ITU-T recommendations V.42bis and V.42 have data compression and error correcting (EC) procedures for
DCEs connected to asynchronous DTEs. These procedures form the basis of Paradyne’s SDC feature.
With the SDC feature, two DTEs can exchange data via a synchronous protocol (Figure 1) while the DCE
provides the new synchronous data compression and error correction functions (Figure 2). The synchronous data
from the local DTE, after compression, is inserted into DCE frames which are sent to the remote DCE. Inverse
operations then occur at the remote DCE.
SDC can be used with V.34 and V.32 family modulations on dial or leased lines, and in a dial backup or standby
mode.
SDC is available as an installable option beginning with firmware Release 3.0.
SYNCHRONOUS
DTE
DCE
19.2 Kb/s
DCE
9.6 Kb/s
SYNCHRONOUS
DTE
19.2 Kb/s
SYNCHRONOUS PROTOCOL
495-14784
Figure 1. Sample DTE Exchange of Data via Synchronous Protocol and SDC
TM
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Summary
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 ...
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...
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...
