
Data Compression Overview
1-9
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 1-1 indicates the maximum number of 8 KB contexts
each board can support.
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 1-2 summarizes this information.
You can use a mix of 8 KB and 32 KB contexts on either board. Be aware that if
you are bringing VCs up and down, memory fragmentation can occur. 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, you must 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 will always be able to add an 8 KB context,
because 8 KB is the smallest divisible amount of compression memory.
Table 1-1. 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
Table 1-2. 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
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