Messages and Troubleshooting
6-4
7510-A2-GB20-00
March 1997
Table 6-2.
Troubleshooting (2 of 2)
Symptom
Solutions
Possible Cause
Not receiving data;
DSU is not
responding.
DDS line rate/speed has
changed.
Excessive BPVs causing
DSU to become stuck in
Autobaud mode.
Excessive Loop Loss
causing DSU to become
stuck in Autobaud mode.
1. Verify that your subscriber loop is
running at 56 or 64 CC kbps.
2. If getting Excessive BPVs, verify
that you do not have a bad cable.
If the cable is good, contact the
network provider.
3. If getting excessive Loop Loss
(dB) indications, install a higher
quality cable. Refer to
Table D-2
in Appendix D,
Model 7510
in Appendix D,
Model 7510
DSU LADS Connection
Distances
.
4. If the DDS Line Rate (Kbps) field
shows Autobaud, the DSU may
be stuck in Autobaud mode.
Configure Line Rate (Kbps) for
56 or 64 kbps.
5. Run Loopback tests. Refer to
Running Network Tests
in of
Chapter 5.
Power-Up Self-Test
fails. Only Alarm
LED is on after
power-up.
The DSU has detected an
internal hardware failure.
Reset the DSU and try again.
Contact your service
representative.
Resetting the DSU
The DSU can be reset locally or remotely.
To reset the DSU, follow this menu selection sequence:
Main Menu
→
Control
→
Reset Device
The DSU reinitializes itself, performing a Device Self-Test. Refer to
Self-Test
Results Messages
, Table 4-3.
Displaying DSU Identity Information
To display the DSU’s system name, location, contact, serial number, model
number, and software and hardware revision numbers, follow this menu selection
sequence:
Main Menu
→
Status
→
Identity
