Nortel NT1R20 Description page 125

Table 24
Line-side T1 card—backplane pinouts
Backplane
Connector Pin
12A
12B
13A
13B
14A
14B
15A
15B
16A
16B
17A
17B
18A
18B
19A
19B
NT5D11 Line-side T1 Interface Card
I/O Panel
Connector Pin Signal
1 T1 Tip, Receive Data
26 T1 Ring, Receive Data
2 T1 Tip, Transmit Data
27 T1 Ring, Transmit Data
3 Alarm out, Normally open
28 Alarm out, Common
4 Alarm out, Normally closed
29 No Connection
5 No Connection
30 Away from MMI terminal,
Receive Data
6 Away from MMI terminal,
Transmit Data
31 Towards MMI terminal,
Transmit Data
7 Towards MMI terminal,
Receive Data
32 Daisy-chain Control 2
8 Daisy-chain Control 1
33 Ground
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Line cards Description