FOM-E1/T1 Installation and Operation Manual Chapter 4 Testing and Diagnostics
Troubleshooting Instructions 4-3
4.3 Troubleshooting Instructions Table 4-2 provides troubleshooting details. Perform the actions listed under
Corrective Measures in the order given in the table, until the problem is corrected.
Table 4-2. Troubleshooting Chart
Symptom Probable Cause(s) Corrective Measures
No AC power
Verify that the power outlet is providing the required power.
Ensure that both ends of the AC power cord are connected
properly.
PWR LED is
OFF
Blown fuse Replace with fuse of proper rating.
One of the four wires is
disconnected from the DB-15
connector of FOM-E1/T1
Ensure all the wires are connected properly to the DB-15
connector.
One of coaxial cables is
disconnected or defective
Ensure that both ends of the coaxial cables are connected
properly and that the cables operate properly.
The attached equipment
outputs are not according to
G.703 electrical levels
Check that the output levels of equipment attached to
FOM-E1/T1 comply with G.703 electrical levels.
ELECTRICAL
LOW LED is
ON
The SW1, SW2 switches are
set incorrectly
Verify that the SW1, SW2 switch positions correspond to the
E1/T1 interface type.
ELECTRICAL
AIS LED is ON
The attached equipment is
transmitting “All 1s" string
Ensure that the equipment attached to the FOM-E1/T1
transmits real data (not “all 1s").
No optical connection. Ensure that both transmit and receive fiber connections on
the local and remote units are connected properly.
OPTICAL ERR
LED is ON
Optical budget is too low Measure the optical loss over the fiber link and verify that it
meets the product specifications.
The equipment attached to
the remote unit is transmitting
“All 1s" string
Check the remote attached equipment transmission.
OPTICAL AIS
LED is ON
The remote unit detected
Electrical Low alert
Check the remote unit and the remote attached equipment
for possible fault.