HP R4.2 - Manual (Page 666)

UCS 1000 R4.2 Administration 585-313-507 Issue 3 April 2000 627
Glossary
Numerics
23B+D
23 bearer (communication) and 1 data (signaling) channel on a T1 PRI circuit card.
30B+D
30 bearer (communication) and 1 data (signaling) channel (plus framing channel 0)
on an E1 PRI circuit card.
47B+D
47 bearer (communication) and 1 data (signaling) channel on two T1 PRI circuit
cards.
4ESS ®
A large Lucent central office switch used to route calls through the telephone
network.