26
T3 FIBER OPTIC LINE DRIVER
Table 5-1 (continued). Troubleshooting chart.
Trouble Symptoms
Probable Cause
Corrective Measures
ELECTRICAL LOW
One of the T3
Make sure that both ends of the T3
indicator is On.
coaxial cables is
coaxial cables are connected
defective or
correctly and that the cables
disconnected.
function properly.
Attached equipment
Verify that the output levels of the
outputs do not
equipment attached to the T3
comply with G.703
interface comply with G.703.
electrical levels.
JP2 is set incorrectly. Check the JP2 settings (see
Table 3-1).
ELECTRICAL AIS
Attached equipment
Check the equipment attached to
indicator is On.
transmits “All 1s.”
the T3 electrical interface; make
sure that the line driver is
transmitting real data.
OPTICAL ERR
No optical connection. Make sure that both transmit and
indicator is On.
receive fiber cables are properly
connected to the local and remote
units.
The optical budget
Measure the optical loss over the
is low.
fiber link and check that it meets
the product specifications.
OPTICAL AIS is On.
The equipment
Check the equipment attached to
attached to the
the remote line driver.
remote unit
transmits “All 1s”
string.
