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Configuring Data Compression Services
3-12
117352-B Rev. 00
Configuring Hardware Compression
There are two issues specific to hardware compression:
Selecting a hardware compression engine
Selecting a fallback compression mode
These two issues are explained in the next two sections.
Selecting Software or Hardware Compression Engines
When you configure a VC for compression, the default compression type varies
depending on whether it is a link or net module, and depending on the type of
router platform.
Table 3-4
shows the dependencies for the default compression type:
You can use software compression even though you are using a hardware
compression daughterboard or net module. Bay Networks recommends that you
use hardware compression for connections greater than 512 Kb/s. You would also
want to specify software compression for VCs in excess of the number of contexts
your hardware compression daughterboard or net module can support.
Configure a VC to use software compression by setting the Engine Type
parameter to Software.
Table 3-4. Default Compression Type Dependencies
Module Type Default Compression Type
Link module that does not support
hardware compression
Software
Link module that supports hardware
compression*
* Refer to “Hardware Compression” on page 2-5.
Hardware
Net module - except for an ASN Software
Net module - ASN with a hardware
compression net module
Hardware
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