Avaya Configuring Data Compression Services Uživatelský manuál stáhnout pdf (Strana 57)

Customizing Data Compression

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You can use software compression even though you are using a hardware

compression daughterboard or net module. Bay Networks recommends that you

use hardware compression for connections operating at speeds greater than

512 Kb/s. You should also specify software compression for VCs in excess of the

number of contexts your hardware compression daughterboard or net module can

support.

Configure a VC to use software compression by setting the Engine Type

parameter to Software.

Selecting Compression Engines

To specify the compression type for this router, modify the Engine Type

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. To modify this parameter for a circuit configured for

Hi/fn LZS compression, access the Hi/fn LZS Interface List window.

For instructions on accessing configuration windows, see “Accessing

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

Appendix A, “Data Compression Parameters.”

Selecting a Fallback Compression Mode

You can set a fallback compression mode when configuring a WCP line interface

or a Hi/fn LZS interface. The fallback compression mode indicates the

compression mode that you want to use when no hardware compression contexts

are available.

When configuring a WCP line interface, the options are as follows:

• Software CPC -- a good choice for lower-speed links, 64 Kb/s or less. It

generally affords a better compression ratio than Hardware PPC.

• Hardware PPC -- a good choice for higher-speed links, greater than 64 Kb/s. It

provides better throughput than Software CPC.

• None -- a good choice for very high-speed links.

When configuring a Hi/fn LZS circuit interface, the options are as follows:

• Software CPC -- a good choice for lower-speed links, 64 Kb/s or less.

• None -- a good choice for extremely high-speed links, greater than 2.5 Mb/s.

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Avaya Configuring Data Compression Services Uživatelský manuál Strana 57