PictureTel Concorde 4500 Servicing Manual page 112

TROUBLESHOOTING
Table 4-5: Network or Communications Failure Checklist (Continued)
If you get
this
message...
(continued)
No Channel
Connection
No Channel Switched-56,
Connection
dialed
Network Not
Ready
4-14
Type of
network It means...
interface
There may be a
problem in the
electronics
module.
Network Not Ready
may indicate a
problem with
the network or
with the cables.
Do this...
4. Replace the network data cables
between the electronics module
and the DCE, and redo the local
loopback of the near-end DCE:
If the test fails, replace the
DCE and go to step5.
If the test is successful, then
it indicates that the original
cabling was at fault. Try to
make a call using the new
cables.
5. Perform another local channel
loopback test at the DCE.
If the test fails, replace the
Communications Processor
board.
If the test is successful, try
placing normal calls with the
new DCE.
1. Make sure that all network
connections to the electronics
module are securely attached.
2. Check the LEDs on the back of the
Communications board and make
sure that the DTR and DCD LEDs
for both ports are lighted and that
all other LEDs are out, as for a
normal idle condition.