Avaya Configuring Data Compression Services Bedienungsanleitung PDF herunterladen (Seite 30)

Configuring Data Compression Services

2-4 114061 Rev. A

Hardware Compression for the BN

The compression daughterboards for the BN are

• AG2104037 - Octal Sync with a 32-contexts hardware compression

daughterboard

• AG2104038 - Octal Sync with a 128-contexts hardware compression

daughterboard

Hardware Compression for the ASN

The hardware compression net modules for the ASN can compress data

transmitted over WAN networks attached to dual and quad synchronous,

MCE1/ISDN PRI, MCT1/ISDN, dual sync with ISDN BRI, and QBRI net

modules. One compression net module in a single ASN can provide hardware

compression for all the net modules on that router. It does not provide

compression for any other ASNs in the stack.

The compression net module is available in both a 32-contexts and a 128-contexts

version.

The compression net modules for the ASN are

• AF2104007 - a 32-contexts hardware compression net module

• AF2104012 - a 128-contexts hardware compression net module

Hardware Compression Contexts

A context refers to compression and decompression for a single virtual

circuit (VC). Compression hardware maps a context to speciﬁc regions of

compression and decompression memory. If you have a 32-contexts compression

daughterboard or net module, you can simultaneously run compression over 31

continuous packet compression (CPC) contexts, each using an 8 KB history size,

with one shared 8 KB packet-by-packet (PPC) context. If you have a 128-contexts

compression daughterboard or net module, you can simultaneously run

compression over 127 CPC contexts, each using an 8 KB history size, with one

shared 8 KB PPC context. For more information on CPC and PPC, see the

“Compression Mode” section later in this chapter.

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Avaya Configuring Data Compression Services Bedienungsanleitung Seite 30