RAD Data comm T1 Manuel D’Utilisation

FOM-E1/T1 Installation and Operation Manual 

Chapter 4  Testing and Diagnostics 

 

Troubleshooting Instructions 

4-3 

provides troubleshooting details. Perform the actions listed under 

Corrective Measures in the order given in the table, until the problem is corrected.

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.