Avaya Configuring Data Compression Services Bedienungsanleitung PDF herunterladen (Seite 45)

Data Compression Overview

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Data Transmission

For PPP links using WCP, Network Control Protocol (NCP) negotiations and

WCP negotiations occur simultaneously. When PPP, NCP, and WCP negotiations

are complete, data transmission using compression begins.

For PPP links using Hi/fn LZS, data transmission using compression begins when

CCP and NCP negotiations are complete.

For frame relay and X.25 links, data transmission using compression begins when

WCP negotiations are complete.

Compression Features for Specific Protocols

Nortel Networks data compression services vary in some details according to the

WAN protocols that you configure. Read the following sections to learn about

how Nortel Networks implements data compression for PPP, frame relay, and

X.25 services.

PPP Services

You can use software or hardware data compression on all PPP circuits, including

multiline and multilink, bandwidth-on-demand, dial-on-demand, and dial backup

lines. When you use compression on a bandwidth-on-demand, dial-on-demand, or

dial backup circuit, WCP automatically configures or deletes compression as lines

are added to or removed from the circuit.

PPP Multiline

Multiline enables you to configure a single circuit consisting of one or more WAN

data paths. A data path is a logical point-to-point channel; it can be a permanent

or dial-up physical line, or it can be a virtual circuit connection. Multiline

provides both increased fault tolerance and greater bandwidth between two sites.

Note:

Enabling WCP adds five bytes to the frame’s header. In most cases, this

has no effect on your data and there is no need for you to adjust the default

configuration. If you want to increase the maximum transmission unit (MTU)

to avoid fragmenting or dropping large packets, refer to the manual for the

WAN protocol you are using.

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Avaya Configuring Data Compression Services Bedienungsanleitung Seite 45