25
CHAPTER 5: Diagnostics and Troubleshooting
Figure 5-3. Remote loopback illustrated.
To activate remote loopback, slide the local line driver’s TEST switch to the REM
position.
The remote line driver’s LOC indicator turns On and remains lit as long as the
remote loopback is active.
5.3 Troubleshooting
If a problem occurs, refer to Table 5-1 for troubleshooting procedures. Perform
the actions listed under Corrective Measures in the order given in the table until
the problem is corrected. If the problem is still not resolved, call Technical
Support as described in Section 5.4.
Table 5-1. Troubleshooting chart.
Trouble Symptoms
Probable Cause
Corrective Measures
POWER indicator is Off.
No AC power.
Verify that the power outlet is
providing the required power.
Make sure that both ends of the
power cable are connected
properly.
Blown fuse.
Replace with a fuse of the correct
rating.
T3/E3
BERT
LOCAL FOM
T3/E3
REM POSITION
COAX
FIBER
REMOTE
FOM
T3/E3
Remote T3
Fiber Optic
Line Driver
Local T3
Fiber Optic
Line Driver
T3 BERT
