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Configuring Data Compression Services

1-2

308616-14.00 Rev 00

Summary of Nortel Networks Data Compression Features

You can configure both software- and hardware-based compression on a circuit or

line basis. Features specific to software and hardware compression follow.

Software-Based Data Compression

Nortel Networks offers two software compression protocols:

• WAN Compression Protocol (WCP) -- for Point-to-Point Protocol (PPP),

frame relay, and X.25 links

• Hi/fn LZS -- for PPP links only

These two protocols use different Lev-Zimpel algorithms to implement

compression and provide different levels of interoperability between Nortel

Networks routers and routers made by other vendors.

If both ends of the connection are Nortel Networks routers, use WCP as the

compression protocol. If the connection is a PPP link and only one end of the

connection is a Nortel Networks router, use Hi/fn LZS.

Software-based data compression works over WAN links. Specifically, WCP

works with PPP, frame relay, and X.25 links; Hi/fn LZS works only with PPP

links. Both WCP and Hi/fn LZS work with PPP multilink. WCP also works with

PPP multiline.

Software compression includes the following features:

• Support for all Nortel Networks platforms: BayStack

™

Access Node (AN

Access Stack Node (ASN

™

), Advanced Remote Node

™

(ARN

™

Backbone Node (BN

), and System 5000

™

• Compression for a Nortel Networks Fast Routing Engine (FRE

) module at

4 x 128 KB/s compressed throughput, full duplex; or 512 KB/s aggregate

compressed throughput

Note:

The Hi/fn

™

LZS

compression option is not included with your initial

purchase of BayRS. Nortel Networks Hi/fn LZS compression software

incorporates LZS (licensed from Hi/fn) and therefore must be purchased

separately. To run Hi/fn LZS compression on a PPP link between a Nortel

Networks router and a non-Nortel Networks router, you must obtain a license

for the Hi/fn LZS compression software, which is delivered on a separate CD.

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