Digital Link DL3800 DS1, Руководство пользователя

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6-4 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
6
It is also possible to verify the path from the DTE through the T1 line to the
remote-end DL3800, provided the DTE equipment can generate and detect
looped back bit streams.
These suggestions can help determine which portion of the network might
be at fault. When discovering a failure, check the simple solutions Þrst. Is
the power turned on? Is the equipment set up and conÞgured properly?
Will swapping cable pairs solve the problem?
The DL3800 is equipped with alarms that alert the user to the existence of
possible problems with the unit, and received signals from the DTE or
network. LEDs on the Module provide a quick indication of the status of
that module: green light indicates everything is functioning normally;
yellow light means the module is powered, conÞgured and ready to be put
into service.
Table 6-1 Troubleshooting
(1 of 5)
Problem Solution
DL3800 doesn’t power up. If the DL3800 is AC powered, make sure it is plugged into a live AC outlet.
If it is DC powered, make sure the respective DC leads are not crossed.
Check all fuses for opens, replace as needed. If the DL3800 blows fuses
continuously, call Digital Link Technical Support.
You cannot communicate
with the remote DL3800. Make sure both units are in Inverse Mux mode, not Single T1 DSU.
Verify that the local and remote units have unique ID’s.
If a DTE device is not connected at either end, set DTE LOSS to None.
For HSSI operation, a DTE device must be connected at each end. If you
must communicate with the remote unit before the DTE devices are
connected, switch to V.35 operation, and set DTE LOSS to None.
Make sure your T1 port LED’s are solid green, indicating that the circuits are
up and running.
The TEST LED on the
DL3800 is constantly on. Make sure no tests are being initiated, and check the TEST display from a
terminal.
If a test is running, end it by selecting the test and set it to Off in the DTE
and NETWORK TESTS MENU
Make sure the DTE device or the T1 carrier is not sending loop up and loop
down codes.