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Configuring Data Compression Services

3-10

117352-B Rev. 00

On a 32 context board, the maximum number of 32 KB contexts is 7, and on a 128

context board, the maximum number of 32 KB contexts is 31, because of the 8 KB

of memory the one PPC context requires.

Table 3-3

shows the maximum number of 32 KB contexts each board can support.

You can mix 8 KB and 32 KB contexts on either board. Be aware that if you are

bringing VCs up and down, memory may fragment. Even though you have 32 or

more KB of compression memory available, if it is on different pages you will not

be able to configure a 32 KB context. To solve this problem, save your

configuration and reset the slot. When you reset the slot, available compression

memory is rearranged to be contiguous.

If you have memory available, you are always able to add an 8 KB context,

because 8 KB is the smallest divisible amount of compression memory.

Modifying the History Size

To maximize throughput, modify the History Size parameter.

To modify this parameter for the line, access the WCP Line Interfaces List

window. To modify this parameter for a circuit, access the WCP Circuit Interfaces

List window.

For information on accessing configuration windows, refer to “Accessing

Configuration Windows” on page 3-2. For parameter descriptions, refer to

Appendix A, “Data Compression Parameters.”

Table 3-3. Hardware Compression -- 32 KB Contexts

Max 32 KB

CPC Contexts

Available 8 KB

CPC Contexts

Reserved 8 KB

PPC Context

32 Context Board

73 1

128 Context Board

31 3 1

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 71 72

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