Avaya Configuring Data Compression Services Manuel d'utilisateur télécharger pdf (Page 28)

Configuring Data Compression Services

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Buffer Size

Buffer size is the amount of memory allocated to keep the transmission history.

You must conﬁgure this parameter to protect against data loss if you run Frame

Relay or PPP. You can select a buffer size of None, Normal, Large, or Very Large.

The default value is Normal. Conﬁgure buffer space based on the following

conditions:

• Length of time it takes for data to travel over the link

A Normal buffer size usually sufﬁces for a coast-to-coast connection within

the United States. You may need a Large or Very Large buffer if your link is

over a satellite connection.

• Number of dropped packets

Increase the buffer size on a link with a large number of dropped packets.

Decrease the buffer size, even to None, to conserve memory on a link with a

very small number of dropped packets.

• Number of resets

Increase the buffer size for a link with a large number of resets and a low

number of dropped packets. Be aware, however, that a high number of resets

may occur for reasons unrelated to buffer size.

Engine Type

The Engine Type parameter determines whether you use hardware or software

compression. The default is software compression, unless you have selected an

octal sync link module that has a hardware compression daughterboard, either

AG2104037 or AG2104038, in which case the default is hardware. This parameter

enables you to use software compression even though you are using one of these

two octal sync link modules. You would select software compression for VCs in

excess of the number of contexts your hardware compression daughterboard can

support.

Note: X.25 is a reliable protocol, which means that it has features that check

for errors and prevent data loss. Bay Networks data compression software

therefore ignores the Buffer Size parameter for X.25, so if you are conﬁguring

compression for X.25, you do not need to set this parameter.

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Avaya Configuring Data Compression Services Manuel d'utilisateur Page 28