Nortel Communication Server 1000S Installation And Configuration Manual page 27

ISDN Primary Rate Interface equipment overview
Note: A QPC757 vintage C is required if the ISL Revert to Conventional
Signaling feature is configured. The QPC757 vintage D is recommended
for combination ISL/PRI networks using NACD or Network Message
Services and ISL networks using modems.
Figure 3
QPC757 DCH faceplate layout
Q
P
C
7
5
7
J1
J2
ISDN Primary Rate Interface
Status LED
The DCHI LED indicates the status of both
ports on the DCHI card.
If both ports are configured, the LED is lit only
when both ports are disabled.
Asynchronous port
This port is used for non-PRI applications.
Print the configuration record to determine how
the port is configured.
Port J1 is always an even number
(0, 2, 4, ...14).
Check the async port status with
LD48
STAT ESDI N
D-channel interface
This port is connected to port J5 on a PRI card.
The D-channel is always channel 24 on a PRI.
Port J2 is always an odd number
(1, 3, 5 ... 15).
Check the D-channel port status with
LD96
STAT DCHI N
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Installation and Configuration