
Configuring Data Compression Services
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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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