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Data Compression Overview

114061 Rev. A 2-7

CCP Negotiations

CCP allows the two ends of a PPP connection to negotiate whether to use data

compression, and if so, which algorithm to use. Our implementation of

compression uses only the LZ-77 algorithm.

In the example shown in Figure

2-1, negotiations begin when PPP establishes a

link. CCP uses the same conﬁguration and network control protocol negotiations

that the Link Control Protocol (LCP) uses. For a detailed explanation of LCP

negotiations, see “Establishing the PPP Link” in Conﬁguring PPP Services.

WCP Negotiations

Frame Relay and X.25 use WCP to negotiate whether to use data compression,

and which algorithm to use. As with PPP, if one side of a link requests an

algorithm that the other side does not support, trafﬁc continues, but in

uncompressed form.

Each side of a link running data compression has a compressor, a decompressor, a

compression history, and a retransmission buffer. When you conﬁgure

compression, you can edit WCP parameters for compression mode, history size,

and buffer size to optimize compression performance on your network.

Data Transmission

Frame Relay and X.25 data transmission using compression begins when WCP

negotiations are complete. For PPP, Network Control Protocol (NCP) negotiations

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

negotiations are complete, data transmission using compression begins.

Note: If one side of a link requests an algorithm that the other side does not

support, trafﬁc over the link continues, but in uncompressed form.

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Avaya Configuring Data Compression Services Manual de usuario Pagina 33