Troubleshooting Isdn Lines - NEC Aspire S Manual

Troubleshooting ISDN Lines

Start
Verify the BRIU PCB
is functioning.
Is the Live Status
LED on the BRIU
PCB flashing green?
Yes
Is the ISDN Layer1
link established
(LD2, LD3 flashing)
on the BRIU PCB?
Yes
Request the CO
perform a
loopback test of
the DSU. Any
problems found?
No
If an external DSU is
used, connect the
ISDN terminal to the
T-Point. Is it possible
to make a call?
Yes
Insert another BRIU PCB
into the same slot in the
CPU. Does it work?
Yes
The BRIU PCB may
need repair.
Aspire S Hardware Manual
Section 3: Installing Extensions and Trunks
Remove the PCB and
insert another BRIU
No
PCB into the same slot.
Does it work?
The BRIU PCB may
need repair.
Verify wiring between
main equipment and
No
CO line.
Is the cable
Yes
wiring correct?
DSU may need repair.
Yes
T-Point portion of the external
No
DSU may need repair.
Check system programming
for the extension. Refer to the
Aspire Software Manual if
No
necessary. Is it possible to
make a call?
The main equipment
(cabinet/CPU) may
need repair.
Section 3: Installing Extensions and Trunks ◆ 3-23
No
Yes
(cabinet/CPU) may
Redo the wires
No
* If it still does not work,
replace the cable(s) and/
or connectors.
Yes
No
Main equipment
need repair.
correctly.
Stop
3