Avaya Configuring Data Compression Services Instrukcja Użytkownika Pobierz pdf (Strona 52)

Configuring Data Compression Services

3-6

117352-C Rev. 00

Modifying the Compression Mode

To specify the mode that the router uses to compress data, modify the

Compression Mode 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 instructions on accessing configuration windows, see “Accessing

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

Appendix A, “Data Compression Parameters.”

Maximizing Throughput

Each side of the link has both a compression and decompression history and a

lookup table. The compression and decompression histories maintain a record of

data that has already traveled across the network. The lookup tables maintain

pointers to redundant strings and the offset and length tokens that replace each of

those strings.

You can specify either 8 KB or 32 KB of local memory to maintain a compression

history. When you make this choice, be aware that you are allocating more

memory than the History Size parameter value indicates.

Table 3-1

lists the amount of memory required for 8 KB and 32 KB history sizes.

If you select different values for history size for the two sides of the link, 8 KB

becomes the history size for both sides of the link.

Hardware compression has similar requirements (see “History Size with

Hardware Compression” on page 3-7).

Table 3-1. Memory Allocation for Software Compression History

Memory Requirements 8 KB History Size 32 KB History Size

Compression history 8 KB 32 KB

Lookup table 16 KB 64 KB

Decompression history 8 KB 32 KB

Total memory required 32 KB 128 KB

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 73 74

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Avaya Configuring Data Compression Services Instrukcja Użytkownika Strona 52