Avaya Configuring Data Compression Services Bedienungsanleitung PDF herunterladen (Seite 51)

Customizing Data Compression

117352-B Rev. 00

3-7

Allocating Compression Memory for WCP

Using WCP across a network involves allocating memory to maximize

compression without taxing the resources of your system. You can select

• A compression mode, to maximize compression ratio.

• A history size, to maximize throughput.

• A buffer size, to prevent data loss.

Maximizing Compression Ratio

You can compress data in one of two modes:

• Continuous packet compression (CPC) maintains compression history across

packets. CPC yields a higher compression ratio than does packet-by-packet.

In most circumstances, you should select CPC, the default value, to maximize

compression.

• Packet-by-packet compression (PPC) creates a new history for each packet.

PPC yields a lower compression ratio than does CPC. Select PPC only for

links that drop a very large number of packets. Be aware that under these

circumstances, implementing data compression may offer little or no

advantage.

If either side of the link specifies PPC, both sides of the link use PPC.

Modifying the Compression Mode

To determine the mode that the router uses to compress data, modify the

Compression Mode parameter.

To modify this parameter for the line, access the WCP Line Interfaces List

window. To modify this parameter for a circuit, access the WCP Circuit Interfaces

List window.

For information on accessing configuration windows, refer to “Accessing

Configuration Windows” on page 3-2. For parameter descriptions, refer to

Appendix A, “Data Compression Parameters.”

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Avaya Configuring Data Compression Services Bedienungsanleitung Seite 51