Nortel Networks 553-3001-211 manual Overview Page 65 DS-30X loop data format

Overview Page 65 of 894

Figure 12

DS-30X loop data format

DS-30X loop	29	30	31	0	1	2	3	4
data words

Frame sync

5.12 MHz
2.56 MHz
Frame sync
DS-30X loop	W31DV W0B7 W0B6	W0B5 W0B4 W0B3 W0B2 W0B1 W0B0 W0SB W0DV W1B7
data bits
	SB = SIGNALING BIT	DV = DATA VALID
		553-6151

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 page 66.

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

Circuit Card Description and Installation