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PPP Compression Control Protocol (CCP) and Compression Algorithms
(Page 1 of 4)
PPP is, of course, primarily used
to provide data link layer connectivity to physical serial links. One
of the biggest problems with serial links compared to many other types
of layer one connections is that they are relatively slow. Consider
that while 10 Mbps regular Ethernet is considered sluggish by modern
LAN standards, it is actually much faster than most serial lines used
for WAN connectivity, which can be 10, 100 or even 1000 times slower.
One way to improve performance over
serial links is to use compression on the data sent over the line. Depending
on the data transferred, this can double the performance compared to
uncompressed transmissions, and can in some cases do even better than
that. For this reason, many hardware devices include the ability to
compress the data stream at the physical layer. The best example of
this is probably the set of compression protocols used on analog modems.
Some physical links don't provide
any compression capabilities, but could still benefit from it. To this
end, an optional compression feature was created for PPP. It is implemented
using two distinct protocol components:
- PPP Compression Control Protocol (CCP):
This protocol is responsible for negotiating and managing the use of
compression on a PPP link.
- PPP Compression Algorithms: A set of compression
algorithms that perform the actual compression and decompression of
data. Several of these are defined in Internet standards (RFCs).
In addition, it is possible for two devices to negotiate the use of
a proprietary compression method if they want to use one not defined
by a public standard.
Key Concept: PPP includes an optional compression feature, which can improve performance over slow physical links. A variety of different compression algorithms are supported. To enable compression, both devices on a PPP link use the PPP Compression Control Protocol (CCP) to negotiate a compression algorithm to use. The compression algorithm is then used to compress and decompress PPP data frames.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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