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Customizing Data Compression
117352-B Rev. 00
3-9
History Size with Hardware Compression
Hardware compression daughterboards and net modules are available in 32 and
128 contexts. The numbers 32 and 128 assume a history size of 8 KB per context,
although you can configure history size at either 8 KB or 32 KB. For example, if
you configure history size at 32 KB, you have used four 8 KB contexts, and you
have that many fewer contexts available to run hardware compression on your
network.
Both boards reserve one 8 KB context for PPC, as opposed to CPC. There is no
limit to the number of VCs that can use this one PPC context. The maximum
number of VCs for the compression engine is 256.
The compression hardware uses memory in units called pages, where a page
equals 32 KB of memory. Each context that uses a 32 KB history uses one page of
memory. Restrictions for CPC contexts using either 8 or 32 KB histories are that
the memory used for any one history must be continuous, and it may not cross
pages. For 8 KB contexts, these restrictions create few constraints, but for 32 KB
contexts, they are significant.
Thirty-one CPC contexts each using an 8 KB history are possible on the 32
context board, and 127 contexts each using an 8 KB history are possible on the
128 context board.
Table 3-2
shows the maximum number of 8 KB contexts each board can support.
Note:
Although software compression does not put strict limits on the number
of contexts you can configure, be aware that memory requirements for history
size are the same for both software and hardware compression.
Table 3-2. Hardware Compression -- 8 KB Contexts
Max 8 KB
CPC Contexts
Available 32 KB
CPC Contexts
Reserved 8 KB
PPC Context
32 Context Board
31 0 1
128 Context Board
127 0 1
- Configuring Data 1
- Compression Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117352-B 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 24
- Finding Further Information 27
- Chapter 2 29
- Data Compression Overview 29
- Data Compression Architecture 31
- Stac LZS Algorithm 32
- Data Compression Performance 33
- Hardware Compression 33
- Hardware Compression Contexts 34
- How Data Compression Works 35
- CCP Negotiations 36
- WCP Negotiations 37
- Data Transmission 37
- PPP Services 38
- Frame Relay Services 40
- X.25 Services 42
- Chapter 3 45
- Customizing Data Compression 45
- WCP Line Interface Parameters 46
- Stac LZS Enable Parameter 50
- Maximizing Compression Ratio 51
- Maximizing Throughput 52
- Disabling Compression 59
- Appendix A 61
- Data Compression Parameters 61
- Stac LZS Parameter 68
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