You're right about B8ZS, but I'm still not sure what you're trying to say
about being "robbed of bits." Even with AMI line coding for mu law voice,
the ones density requirement is satisfied simply by omitting the all-zeros
code. The mu law coding doesn't change when the line uses B8ZS. In either
case, 255 of the 256 possible octets may be used, provided that the FCC
power limits aren't exceeded.
The term "robbed bit signaling" has a specific meaning that is independent
of whether the line uses AMI/B8ZS or D4(SF)/ESF. Using "robbed bit" in
the context of T1 to mean anything other than RBS is quite confusing (to
me, anyway.)
If you use ISDN PRI access, then you must use B8ZS for clear-channel data,
and that access link will not have the RBS impairment. But even then,
V.90 calls to your PortMaster might traverse multiple hops with RBS.
-- Ed Schulz edschulz@lucent.com - To unsubscribe, email 'majordomo@livingston.com' with 'unsubscribe portmaster-users' in the body of the message. Searchable list archive: <URL:http://www.livingston.com/Tech/archive/>