Avaya Configuring Data Compression Services Bedienungsanleitung PDF herunterladen (Seite 35)

Data Compression Overview

117352-B Rev. 00

2-7

The difference between the Bay Networks 32-contexts and 128-contexts

daughterboards and net modules is their amount of memory. The 128-contexts

daughterboard and net module have more memory -- 2 MB compression/1 MB

decompression. The 32-contexts daughterboard and net module have only 512 KB

compression/256 KB decompression.

For more information on CPC and PPC, see Chapter 3, “Customizing Data

Compression.”

How Data Compression Works

To transmit compressed data, the router must complete one or both of the

following:

• CCP negotiations -- for PPP connections using WCP or Stac LZS

• WCP negotiations -- for PPP, frame relay, and X.25 connections using WCP

The following sections describe how these negotiations work. As you read these

sections, refer to Figure 2-1

, which illustrates CCP and WCP initialization on a

PPP link. Figure 2-1

applies for Stac LZS also, but only steps 1, 3, and 4.

If compression is across a frame relay or X.25 link, the router only negotiates

WCP then data transmission can take place. CCP does not apply.

Note:

You should plan your network to use hardware compression on the VCs

most important to you within the limits of your equipment. If you configure

more VCs for hardware compression than your daughterboard or net module

can support, you cannot control which VCs will use hardware compression.

By default, all VCs that exceed the hardware context limit use software

compression.

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Avaya Configuring Data Compression Services Bedienungsanleitung Seite 35