Paradyne 3980-A2-GZ40-20 Technisches Datenblatt

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

2November 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 or the DCP.

Installing the SDC Feature Using the DCP

To install SDC using the DCP, use this procedure.

1. Press the key until Control appears. Press F1.

2. Press the key until Install appears. Press F1.

3. If the SDC option is not visible, press the key until SDC appears.

NOTE: If SDC has been installed on this modem, SDC will not appear.

4. Press the function key (F1, F2, or F3) directly beneath SDC.

5. Enter the Product Authorization Code for SDC:

•Use the and keys to move the cursor to each digit position.

•Press F2 to increment each digit to the required value. The Product Authorization Code for SDC is:

0 1 1 9 9 3

6. Once the digits are set to the required values, press F1 (to select Ent).

7. Press the key to go to the top of the menu tree, then press the key until Status appears. Press F1.

8. Press the key until Options appears. Press F2 or F3.

9. Scroll through the installed options. SDC is listed among them.

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.

11. Set the SDC configuration options suitable for your environment. See Tables 1 and 2.

Installing the SDC Feature Using AT Commands

To install SDC using AT commands, use this procedure.

1. Attach a DTE to the modem.

2. Load the Async Dial factory template:

•From the DCP, select Async Dial from the Factory group of the Configure branch, or

•If AT commands are enabled, enter the AT&F0 command.

3. Install the SDC feature. Enter the command: AT&&I12=011993

The modem responds OK.

4. Perform a power reset. Enter the command: ATZ9

5. Check the installed features. Enter the command: AT&&I0

The modem responds with a list of features installed in your modem, including SDC.

6. Set the SDC configuration options suitable for your environment. See Tables 3 and 4.

Menu Status and Result Codes

When SDC is active and the modem is online, the top line of the DCP display shows Online:mrV42t,

Leased:mrV42t, Backup:mrV42t, or Stndby:mrV42t, where mr is the modem rate. For example,

Online:33.6V42t is displayed on the DCP of a modem using SDC and connected to a dial line at 33,600 bits per

second (bps).

When extended result codes are set to contain the data compression protocol, and SDC is active, connect

messages include the characters V42t. For example, when a modem with SDC active connects to a dial line at

33,600 bps, the result code CONNECT 33600/V42t/RX=33600/TX=33600 is sent to the DTE.

4November 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 Table 1)

•Sync Comp Mode

•SDC Negotiation

•SDC Idle Fill

•SDC Bit Encoding

•Sync DTE CRC

•SDC Delay Min

•Sync Flow Control

•TX Buff Disc Delay

•RX Buff Disc Delay

•Max Frame Size

•Cellular Enhance

DTE Interface (see Table 2)

•Sync DTE Rate

•Tx Clock Source

3980-A2-GZ40-20 November 1996

Table 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 Synchronous Data Compression mode.

HDLC/SDLC – Enables the Synchronous Data Compression mode

The AT command for Sync Comp Mode is #SC

. See Table 3, page 9.

SDC Negotiation: LAPM_Buffer

Nxt LAPM_Buffer LAPM_Discon

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 Data Compression Negotiation. Determines the type of negotiation used when the modem attempts to

connect using SDC. See Table 5, page 15.

Link Access Procedure for Modems or Buffer – The modem attempts to establish an SDC connection. If the remote

modem has SDC capability, then the connection is established with SDC active. If the remote synchronous modem does

not have SDC capability, then the local connection is made in Buffer mode.

Link Access Procedure for Modems or Disconnect – The modem attempts to establish an SDC connection. If the

remote modem has SDC capability, then the connection is established with SDC active. If the remote modem does not

have SDC capability, then no connection occurs and the modem generates a disconnect.

The AT command for SDC Negotiation is S28=

. See Table 4, page 10.

SDC Idle Fill: Flag_Fill

Nxt Flag_Fill Mark_Fill

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 Data Compression Idle Fill. Determines whether the modem uses an HDLC flag or mark to fill the time

between DTE frame transfers.

Flag_Fill – Causes the modem to fill the time between DTE frame transfers with HDLC flags.

Mark_Fill – Causes the modem to fill the time between DTE frame transfers with marks.

The AT command for SDC Idle Fill is S29=

. See Table 4, page 10.

SDC BitEncoding: NRZ

Nxt NRZ NRZI

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 Data Compression Bit Encoding. Determines the type of bit encoding scheme (NRZ or NRZI) the modem

uses when transmitting synchronous DTE data.

NRZ – Causes the modem to use the standard Non Return to Zero bit encoding scheme.

NRZI – Causes the modem to use the Non Return to Zero Inverted bit encoding scheme.

The AT command for SDC Bit Encoding is S31=

. See Table 4, page 11.

6November 1996 3980-A2-GZ40-20

Table 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 the DTE frame is transmitted from modem to modem.

Ignore – No assumption is made about the CRC type. The CRC is transmitted along with the other data in the frame.

CRC16 – The CRC is known to be the 16-bit CRC for HDLC frames defined by ITU-T (generator polynomial x16 +

x12 + x5+ 1). It is removed from the DTE frame by the sending modem and added to the DTE frame by the receiving

modem.

The AT command for SyncDTE CRC is S32=

. See Table 4, page 11.

SDC Delay Min: Off

Nxt Off Rx_Clock

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 Data Compression Delay Minimization. Allows the modem to transmit a DTE frame to its DTE in a

discontinuous way to minimize the delay introduced by SDC processing.

Off – The modem does not begin transmitting a frame to its DTE until the entire frame has been received.

Rx_Clock – The modem begins to transmit data from a DTE frame to its DTE even if the end of the DTE frame has not

yet been received by the modem. The receive clock (circuit 115) is clamped when the beginning of a DTE frame has been

transmitted to the DTE and no other data from this DTE frame has been received by the modem. As soon as data from

the current DTE frame can be transmitted to the DTE, the receive clock is released. The Rx_Clock option appears only if

the Tx Clock Source configuration option is set to Internal.

The AT command for SDC Delay Min is #DM

. See Table 3, page 9.

Sync Flow Cntrl: None

Nxt None Tx_Clock CTS_SyncDTE

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 Flow Control. Controls the type of synchronous data flow control while using data compression.

None – Modem does not control the flow from the synchronous DTE.

Tx_Clock – The transmit clock (circuit 114) clamps when the modem is unable to accept supplementary data from the

DTE. Tx_Clock appears only if the Tx Clock Source configuration option is set to Internal.

CTS_SyncDTE – CTS signal circuit (106) is set to OFF when the modem is unable to accept supplementary data from

the DTE.

The AT command for Sync Flow Cntrl is #Q

. See Table 3, page 9.

3980-A2-GZ40-20 November 1996

Table 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

not

configured for DirectMode, or when Async/Sync Mode is configured for Sync and Sync Comp Mode is

not

configured for DirectMode.

Transmit Buffer Disconnect Delay. Determines how long the modem continues to transmit data stored in its Transmit

buffer when the modem is commanded to disconnect by a locally attached DTE.

Disable – Modem disconnects immediately without attempting to send data stored in its buffer.

10, 60 sec – Maximum amount of time the modem tries to empty its buffer before disconnecting. In both cases (10 sec

and 60 sec), the modem disconnects much sooner if it can empty its buffer.

The AT command for TXBuffDiscDelay is S49=

RXBuffDiscDelay: 10sec

Nxt 10sec Disable 60sec

This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode

not

configured for DirectMode, or when Async/Sync Mode is configured for Sync and Sync Comp Mode is

not

configured for DirectMode.

Receive Buffer Disconnect Delay. Determines how long the modem continues to send to the DTE data stored in its

Receive buffer when the modem is commanded to disconnect by a locally attached DTE, or detects a line disconnect.

Disable – Modem disconnects immediately without attempting to send data stored in its buffer.

10, 60 sec – Maximum amount of time the modem tries to empty its buffer before disconnecting. In both cases (10 sec

and 60 sec), the modem disconnects much sooner if it can empty its buffer.

The AT command for RXBuffDiscDelay is S39=

Max Frame Size: 256

Nxt 256 192 128 64 32 16

This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode

not

configured for BufferMode or DirectMode, or when Async/Sync Mode is configured for Sync and Sync

Comp Mode is

not

configured for DirectMode.

Maximum Frame Size. Sets the maximum frame size for V.42 and MNP. For MNP operation, 64 is the minimum value.

Any value less than that will automatically default to 64. For cellular applications, at least one of the sides should be set to

a low value. A setting of 32 is recommended. Only one modem needs this setting; both modems will automatically default

to the greatest common value.

The AT Command for Max Frame Size is \A

CellularEnhance: Disable

Nxt Disable Enable

This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode

is configured for V42/MNPorBfr, V42MNPorDsc, LAPM_or_Disc, or LAPM_or Bfr, or when Async/Sync Mode is

configured for Sync and Sync Comp Mode is

not

configured for DirectMode.

Cellular Enhancement. When enabled, the modem uses non-standard techniques to enhance V.42 operation for cellular

applications. It is still compatible, however, with modems which do not have the cellular enhancement implemented or

enabled.

The AT command for CellularEnhance is S91=

8November 1996 3980-A2-GZ40-20

Table 2

DTE Interface Configuration Options for SDC

Sync DTE Rate: 128000

Nxt 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 option is set to Async.

•Sync Comp Mode configuration option is set to DirectMode.

•Tx Clock Source configuration option is set to External.

•The SDC feature is disabled.

Synchronous DTE Data Rate. Identifies the synchronous DTE’s operating rate to the modem. Data rates from

128,000 bps to 1200 bps are supported.

NOTE: A cable less than fifty feet in length is required for rates over 19,200 bps. Data synchronization at rates over

57,600 bps is sensitive to cable length and capacitance, and the DTE’s drivers and receivers. External transmit

clocking may be required.

The AT command for Sync DTE Rate is S30=

. See Table 4, page 10.

Tx Clock Source: Internal

Nxt Internal External RXC_Loop

This configuration option only appears when Async/Sync Mode is configured for Sync.

Transmit Clock Source. Determines the source of timing for synchronous data transmitted from the DTE.

Internal – The transmit data’s clock source is derived from the modem’s internal clock. This clock is available as an

output on Pin 15 (TXC) of the EIA-232-D interface.

External – The transmit data’s clock source is provided by the DTE on Pin 24 (XTXC) on the EIA-232-D interface.

Receive Clock Loop – The modem’s transmit clock is derived from its received analog signal. The derived clock is

available as an output on Pin 15 (TXC) of the EIA-232-D interface.

NOTE: RXC_Loop does not appear if SDC is enabled.

NOTE: TMp tributaries are forced to RXC_Loop.

The AT command for Tx Clock Source is &X

3980-A2-GZ40-20 November 1996

Table 3

AT Commands for SDC

Command Description DCP LCD

Command

Sequence

#DM

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 the entire frame has been received.

#DM1 Delay minimization. The modem begins to transmit data from a

DTE frame to its DTE even if the end of the DTE frame has not yet

been received by the modem.

The factory setting is No Delay Minimization.

Configure\Edit\

V42/MNP/Buffer

Sync Flow Ctrl. Synchronous Flow Control of DTE.

Controls the type of synchronous data flow control while using data

compression.

#Q0 No flow control.

#Q1 Flow control using transmit clock (circuit 114).

#Q2 Flow control using CTS (circuit 106).

The factory setting is No Flow Control.

Configure\Edit\

V42/MNP/Buffer

#SC

Sync Comp Mode. Synchronous Compression Mode.

Enables and disables synchronous data compression.

#SC0 Disable Synchronous Data Compression mode.

#SC1 Enable Synchronous Data Compression mode.

The factory setting is Disable.

Configure\Edit\

V42/MNP/Buffer

10 November 1996 3980-A2-GZ40-20

Table 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.

0 = LAPM_Buffer

1 = LAPM_Discon

The factory setting is LAPM_Buffer.

Configure\Edit\

V42/MNP/Buffer

S29 SDC Idle Fill.

Determines whether the modem uses an HDLC flag or mark to fill the time

between DTE frame transfers.

0 = Flag_Fill

1 = Mark_Fill

The factory setting is Flag_Fill.

Configure\Edit\

V42/MNP/Buffer

S30 Sync DTE Rate. Synchronous DTE Rate.

Identifies the synchronous DTE’s operating rate to the modem.

0 = 128,000 bps

1 = 115,200 bps

2 = 112,000 bps

3 = 96,000 bps

4 = 76,800 bps

5 = 72,000 bps

6 = 64,000 bps

7 = 57,600 bps

8 = 56,000 bps

9 = 48,000 bps

10 = 38,400 bps

11 = 28,800 bps

12 = 19,200 bps

13 = 14,400 bps

14 = 9600 bps

15 = 4800 bps

16 = 2400 bps

17 = 1200 bps

The factory setting is 128,000 bps.

Configure\Edit\

DTE Interface

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