Figure 44 Hssi Wan Interface Card; Table 34 T3 Cable Pinouts - Nortel 1750 Install Manual

100 Appendix A Technical specifications
Table 33 X.21 cable pinouts (continued)
Standard-wired
end 28-pin male
1
7
The following notes apply to the single X.21 cable:
1. Wires of pair 4 connect to wires of pair 5, but not to any pins in the DA-15.
2. The term "no conn" means the wire is not connected to a pin in the 15-pin connector.
3. Wires 13B and 14B connect to pin 8 in the 15-pin connector.
4. At each end, the cable shield and connector shell must connect to pin 1 of the connector.
5. Do not interconnect Shield to Signal Ground because these are separate signals.
HSSI WAN interface card
The HSSI WAN interface card has a 50-pin SCSI II female connector that
provides the signals needed to interface to a T3 modem or modem eliminator.
Figure 44

Figure 44 HSSI WAN interface card

Included in the accessory box is a cable that maps the T3 signals out to a 50-pin
SCSI II male connector.
Table 34

Table 34 T3 cable pinouts

50-pin SCSI male
1
2
3
4
5
NN46110-316 02.01
Signal name
SHIELD
SIGNAL GROUND
shows the HSSI WAN interface card.
provides the T3 cable pinouts.
Signal name
GND
RCB
CAB
RDB
LCB
Pair number
and conductor
pair 14A
pair 14B
50-pin SCSI male
1
2
3
4
5
Standard-wired
end 15-pin male
1
8
CS460003A
Notes
Note 4,5
Note 3,5