Nortel Networks 1750 User Manual
96 Appendix A Technical specifications
NN46110-316 03.01
HSSI WAN interface card
The HSSI WAN interface card has a 50-pin SCSI II female connector that
provides the signals to interface to a T3 modem or modem eliminator. The
following figure shows the HSSI WAN interface card.
provides the signals to interface to a T3 modem or modem eliminator. The
following figure shows the HSSI WAN interface card.
Figure 34 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.
SCSI II male connector.
The following table provides the T3 cable pinouts.
1
SHIELD
Pair 14A
1
At each end, the cable
shield and connector shell
must connect to pin 1 of the
connector.
Do not interconnect Shield
to Signal Ground because
these are separate signals.
shield and connector shell
must connect to pin 1 of the
connector.
Do not interconnect Shield
to Signal Ground because
these are separate signals.
7
SIGNAL GROUND
Pair 14B
8
Wires 13B and 14B
connect to pin 8 in the
15-pin connector.
Do not interconnect Shield
to Signal Ground because
these are separate signals.
connect to pin 8 in the
15-pin connector.
Do not interconnect Shield
to Signal Ground because
these are separate signals.
Table 34 T3 cable pinouts
50-pin SCSI male
Signal name
50-pin SCSI male
1
GND
1
2
RCB
2
Table 33 X.21 cable pinouts (continued)
Standard-
wired end
28-pin male Signal name
wired end
28-pin male Signal name
Pair number
and conductor
and conductor
Standard-
wired end
15-pin male
wired end
15-pin male
Notes
CS460003A