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T1/E1 FIBEROPTIC LINE DRIVER
5. Troubleshooting
In case a problem occurs, refer to
Table 5-1
. Perform the actions listed under
“Corrective Measures” in the order given until the problem is corrected.
Table 5-1. Troubleshooting Chart.
Symptom
Probable Causes
Corrective Measures
POWER
No AC power.
Make sure that both ends of the AC
indicator is OFF.
power cable are connected properly.
Blown fuse.
Replace with fuse of proper rating.
Defective Line Driver.
Replace the Line Driver.
SIGNAL LOSS
Incorrect optical signal
(a) Make sure that the electrical
indicator lights.
level received at the
interface is connected.
receiver input.
(b) Make sure that the INTERFACE
No signal is present at
switch is set to the appropriate setting.
the electrical interface.
(c) Make sure that the fiberoptic cable
is properly connected to the RX
connector.
(d) Make sure that the remote unit
power is on and the TX fiberoptic
connector is connected properly.
(e) Measure the optical levels on both
ends (if possible) in order to check the
optical link. Make sure that the RANGE
switches for both units are set properly.
(f) Replace the faulty Line Driver.
