Nortel Circuit Card Installation Manual page 67

Figure 12
DS-30X loop data format
DS-30X loop
data words
Frame
sync
5.12 MHz
2.56 MHz
Frame sync
DS-30X loop
W31DV
data bits
SB = SIGNALING BIT
29 30 31
W0B7 W0B6 W0B5 W0B4 W0B3 W0B2 W0B1 W0B0 W0SB W0DV W1B7
DV = DATA VALID
signaling data to the line card, it is sent as a 24-bit word divided among 24
successive DS-30X frames.
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 on
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 (553-3021-120) 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 LAN link. This
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