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Data Compression Overview
117352-C Rev. 00
2-7
• A 128-contexts compression daughterboard or net module can run
compression simultaneously over 127 CPC contexts, each using an 8 KB
history size, with one shared 8 KB PPC context.
• A 256-contexts advanced compression coprocessor daughterboard installed
on a FRE-2-060E processor module can run compression simultaneously over
255 CPC contexts, each using an 8 KB history size, with one shared
8 KB PPC context.
The 32-contexts, 128-contexts, and 256-contexts daughterboards and net modules
differ in their amount of memory.
• The 32-contexts daughterboard and net module have 512 KB compression/
256 KB decompression.
• The 128-contexts daughterboards and net module have 2 MB compression/
1 MB decompression.
• The 256-contexts advanced compression coprocessor daughterboard has
4 MB compression/2 MB decompression.
For information about customizing CPC and PPC, see Chapter 3, “Customizing
Data Compression.”
Hardware Compression Contexts for Hi/fn LZS
Hi/fn LZS supports a 2 KB history size and CPC contexts only. Hi/fn LZS does
not support PPC contexts.
Note:
You should plan your network to use hardware compression on the VCs
most important to you within the limits of your equipment. If you configure
more VCs for hardware compression than your daughterboard or net module
can support, you cannot control which VCs will use hardware compression.
By default, all VCs that exceed the hardware context limit use software
compression.
- Configuring Data 1
- Compression Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117352-C Rev. 00 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- Bay Networks Customer Service 16
- How to Get Help 17
- Starting Compression 19
- Chapter 1 19
- Enabling Compression for X.25 25
- (continued) 26
- (continued) 28
- For More Information 29
- Chapter 2 31
- Data Compression Overview 31
- Data Compression Architecture 33
- Hi/fn LZS Algorithm 34
- Data Compression Performance 35
- Hardware Compression 35
- How Data Compression Works 38
- CCP Negotiations 40
- WCP Negotiations 40
- Data Transmission 41
- PPP Services 41
- Frame Relay Services 44
- X.25 Services 45
- Chapter 3 47
- Customizing Data Compression 47
- WCP Line Interface Parameters 48
- Maximizing Throughput 52
- Disabling Compression 59
- Appendix A 61
- Data Compression Parameters 61
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