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Configuring PPP Services

2-22

308639-14.00 Rev 00

In addition to LQR packets, PPP periodically transmits echo-request packets

(when echo-request is enabled). If the peer transmits a user-specified number of

echo requests before receiving an echo reply from its peer router, the router

disables the link and restarts.

PPP Data Compression

The Nortel Networks data compression feature lets you reduce line costs and

improve response times over wide area networks (WANs) running PPP.

Data compression eliminates redundancies in data streams. When you use

compression on your network, bandwidth efficiency improves, and you can

transmit more data over a given amount of network bandwidth.

Nortel Networks data compression services for PPP include:

• Software-based compression (WCP and Hi/fn

™

LZS

) for all platforms and

all serial interfaces

• Hardware-based data compression for PPP networks that use the octal

synchronous link module for the Backbone Node (BN

), using only FRE

-2

processors, and the FRE-2-060E processor module with the advanced

compression coprocessor daughterboard.

• Hardware-based data compression for PPP networks that use the compression

net module for the Access Stack Node (ASN).

You can use data compression on all PPP circuits, including multiline, multilink,

bandwidth-on-demand, dial-on-demand, dial backup lines, and on ISDN BRI and

PRI modules. You can use compression separately on each member of a multilink

bundle. When you use compression on a bandwidth-on-demand, dial-on-demand,

or dial backup circuit, the data compression feature automatically configures or

deletes compression as lines are added to or removed from the circuit.

For complete descriptions of hardware and software data compression,

descriptions of compression parameters, and instructions for configuring

compression over a PPP interface, see Configuring Data Compression Services.

Note:

Echo-requests are disabled by default and are in no way related to link

quality reporting.

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