This indicates the number of PPC (Per Packet Compression)
Mode VC's allocated for HW Compression. This value ALWAYS
equates to 1, as 1 PPC Context is ALWAYS reserved as a
resource for any VC doing HW Compression to use.
All VC's configured to run in PPC Mode share this context.
This context is also used when a VC enters Transient PPC
Compression Mode, which occurs when frames are dropped
or errors occur on the physical link.