Nortel Communication Server 100 Manual page 22

22 Carrier Remote IPE product description
The communication and signaling between the system and the Carrier
Remote IPE is performed over the first three timeslots of each T1 or E1
carrier link including the spare link. The other timeslots of each carrier link
are used to transmit voice and data information originating and terminating
at Remote IPE subscriber stations.
All three carriers transmit the same messages and signaling across the
carrier link; however, the system selects only one carrier for signaling and
message handling. Which carrier it uses depends on the past carrier link
events, or when one carrier has a lower error rate than the other carriers
in the link, the system selects the carrier with the lowest error rate for
signaling and message extraction.
A T1 or an E1 carrier link between the Local Carrier Interface card and a
Remote Carrier Interface card can be configured with one to three carrier
links, where all three links carry traffic or where one of the two links can be
assigned as a spare link that is standing by to take over traffic when an
active link fails.
Figure 4 "System functional architecture" (page 23) illustrates the system
functional architecture on a broad block diagram level to show the three
basic types of functions.
Nortel Communication Server 1000
Carrier Remote IPE Fundamentals
NN43021-555 04.01 4 June 2010
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