Nortel Networks Circuit Card 311 - Manual (Page 51)

Operation 51
clock frequency supplied by the controller card). The timeslot repetition rate
for a single channel is 8 kHz. The controller card also supplies a locally
generated 1 kHz frame sync signal for channel synchronization.
Signaling data is transmitted to and from the line cards using the call
signaling bit within the 10-bit channel. When the line card detects a
condition that the switch needs to know about, it creates a 24-bit signaling
word. This word is shifted out on the signaling bit for the associated channel
one bit at a time during 24 successive DS-30X frames. Conversely, when
the switch sends signaling data to the line card, it is sent as a 24-bit word
divided among 24 successive DS-30X frames.
Figure 12
DS-30X loop data format
DS-30Y network loops extend between controller cards and superloop
network cards in the common equipment, and function in a manner similar
to DS-30X loops. See
Figure 13 "Network connections to IPE modules"
(page 52) .
Essentially, a DS-30Y loop carries the PCM timeslot traffic of a DS-30X
loop. Four DS-30Y network loops form a superloop with a capacity of 128
channels (120 usable timeslots).
See Communication Server 1000M and Meridian 1 Large System Planning
and Engineering (NN43021-220) for more information on superloops.
Card LAN link Maintenance communication is the exchange of control
and status data between IPE line or trunk cards and the CE CPU by way of
the NT8D01 Controller Card. Maintenance data is transported via the card
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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