
Configuring Data Compression Services
2-8
117352-D Rev. 00
How Data Compression Works
To transmit compressed data, the router must complete one or both of the
following:
• CCP negotiations (for PPP connections using WCP or Hi/fn LZS)
• WCP negotiations (for PPP, frame relay, and X.25 connections using WCP)
The following sections describe how these negotiations work. As you read these
sections, see Figure 2-1
, which illustrates CCP and WCP initialization on a PPP
link.
If compression is across a frame relay or X.25 link, the router negotiates only
WCP; CCP does not apply.
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