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142 NT1R20 Off-Premise Station Analog Line card
ready to receive digits, it returns a dial tone. Outward address signaling is
then applied from the telephone in the form of loop (interrupting) dial pulses
or DTMF tones.
For outgoing calls from a telephone, a line unit is seized when the telephone
goes off-hook, placing a low-resistance loop across the tip and ring
leads towards the OPS analog line card (see Table 69 "Call connection
sequence-near-end station receiving call" (page 141)). When the card
detects the low-resistance loop, it prepares to receive digits. When the
Meridian 1 is ready to receive digits, it returns dial tone. Outward address
signaling is then applied from the telephone in the form of loop (interrupting)
dial pulses or DTMF tones.
Connector pin assignments
The OPS analog line card brings the eight analog telephone lines to the IPE
backplane through a 160-pin connector shroud. The backplane is cabled
to the input/output (I/O) panel on the rear of the module, which is then
connected to the Main Distribution Frame (MDF) by 25-pair cables.
Telephone lines from station equipment cross connect to the OPS analog
line card at the MDF using a wiring plan similar to that used for trunk
cards. A typical connection example is shown in Figure 23 "OPS analog
line card - typical cross connection example" (page 143), and a list of the
connections to the analog line card is shown in Table 70 "OPS analog line
card - backplane pinouts" (page 142). See Communication Server 1000M
and Meridian 1 Large System Installation and Configuration (NN43021-310)
for more detailed I/O panel connector information and wire assignments
for each tip/ring pair.
Table 70
OPS analog line card - backplane pinouts
Backplane
Connector
Pin Signal
Backplane
Connector
Pin Signal
12A Unit 0, Ring 12B Unit 0, Tip
13A Unit 1, Ring 13B Unit 1, Tip
14A Unit 2, Ring 14B Unit 2, Tip
15A Unit 3, Ring 15B Unit 3, Tip
16A Unit 4, Ring 16B Unit 4, Tip
17A Unit 5, Ring 17B Unit 5, Tip
18A Unit 6, Ring 18B Unit 6, Tip
19A Unit 7, Ring 19B Unit 7, Tip
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.