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Avaya Configuring Data Compression Services Manuel d'utilisateur Page 67

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Site Manager Parameters
117352-D Rev. 00
A-5
Parameter: History Size
Path: Configuration Manager > Protocols > WCP > Lines
Default: 32K
Options: 32K
|
8K
Function: Specifies the amount of memory allocated to compression history for the line.
Remember that history size has separate compression and decompression
histories and lookup tables on each side of a link.
If the link uses software compression with a history of 8 KB, each end of the
link allocates a total of 32 KB as follows:
• 8 KB for compression
• 16 KB for a lookup table
• 8 KB for decompression
If the link uses a compression history of 32 KB, each end of the link allocates a
total of 128 KB as follows:
• 32 KB for compression
• 64 KB for a lookup table
• 32 KB for decompression
Hardware compression has similar requirements.
Selecting 32K for PPP WCP should not be a problem for the BN, because PPP
allows only one circuit per line. Select 8K or 32K for frame relay and X.25
lines, depending on the resources of your network.
Selecting 32K for PPP WCP on the ASN can cause problems, particularly if you
are using a 32-context compression net module.
In general, 8 KB histories are appropriate for WAN links that run at speeds of
64 Kb/s or less, because less throughput is required. Use an 8 KB history size
with frame relay and X.25, which have large numbers of VCs and may have low
available bandwidth, and with PPP on a 32-context net module.
You may want to allocate a 32 KB history size for links with speeds higher than
64 Kb/s to improve throughput. The compression engine can find a data pattern
match up to three times faster using a 32 KB history.
If you select different history sizes for each side of a link, the smaller of the two
becomes the effective history size.
Instructions: Select either 32K or 8K.
MIB Object ID: 1.3.6.1.4.1.18.3.4.22.1.1.6
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