Paradyne 7520, Руководство пользователя, Страница: 50 / 76

Messages and Troubleshooting
6-4
7520-A2-GB20-20 May 1998
Table 6-2. Troubleshooting (2 of 2)
Symptom Solutions Possible Cause
Not receiving data;
DSU is not
responding. DDS line rate/speed has
changed.
Improper configuration
Bad cable
Verify that the DSU is set for the
same rate as your subscriber
loop. (The DSU’s rate is
displayed on the Network
Interface Status screen.)
If getting excessive Loop Loss
(dB) indications, install a higher
quality cable. Refer to Table D-2
in Appendix D,
Model 7520 DSU
LADS Connection Distances
pp
LADS Connection Distances .
Verify that the DTE Port specified
(see Table A-3 in Appendix A,
Data Port Options ) is the same
one that is physically connected
to a DTE.
Run Loopback tests. Refer to
Running Network Tests in
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 Table 4-3,
Self-Test Results Messages .
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