Avaya Configuring Data Compression Services Manuel d'utilisateur télécharger pdf (Page 51)

Customizing Data Compression

117352-D Rev. 00

3-5

Compression daughterboards 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 KB or 32 KB histories are

that the memory used for any one history must be continuous, and that it may not

cross pages. For 8 KB contexts, these restrictions create few constraints, but for 32

KB contexts, they are significant.

Table 3-2

shows the maximum number of 8 KB contexts each daughterboard or

net module can support.

Table 3-3

shows the maximum number of 32 KB contexts each daughterboard or

net module can support.

Table 3-2. Hardware Compression: 8 KB Contexts

Daughterboard or Net Module

Maximum 8 KB

CPC Contexts

Available 32 KB

CPC Contexts

Reserved 8 KB

PPC Contexts

32-context 31 0 1

128-context 127 0 1

256-context (advanced

compression coprocessor

daughterboard)

255 0 1

Table 3-3. Hardware Compression: 32 KB Contexts

Daughterboard or Net Module

Maximum 32 KB

CPC Contexts

Available 8 KB

CPC Contexts

Reserved 8 KB

PPC Contexts

32-context 7 3 1

128-context 31 3 1

256-context (advanced

compression coprocessor

daughterboard)

63 3 1

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 102 103

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Avaya Configuring Data Compression Services Manuel d'utilisateur Page 51

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