FOM-E1/T1Installation and Operation ManualChapter 4 Testing and Diagnostics

4.3 Troubleshooting Instructions

Table 4-2provides 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

 

 

 

PWR LED is

No AC power

Verify that the power outlet is providing the required power.

OFF

 

Ensure that both ends of the AC power cord are connected

 

 

properly.

 

 

 

 

Blown fuse

Replace with fuse of proper rating.

 

 

 

ELECTRICAL

One of the four wires is

Ensure all the wires are connected properly to the DB-15

LOW LED is

disconnected from the DB-15

connector.

ON

connector of FOM-E1/T1

 

 

 

 

 

One of coaxial cables is

Ensure that both ends of the coaxial cables are connected

 

disconnected or defective

properly and that the cables operate properly.

 

 

 

 

The attached equipment

Check that the output levels of equipment attached to

 

outputs are not according to

FOM-E1/T1 comply with G.703 electrical levels.

 

G.703 electrical levels

 

 

 

 

 

The SW1, SW2 switches are

Verify that the SW1, SW2 switch positions correspond to the

 

set incorrectly

E1/T1 interface type.

 

 

 

ELECTRICAL

The attached equipment is

Ensure that the equipment attached to the FOM-E1/T1

AIS LED is ON

transmitting “All 1s" string

transmits real data (not “all 1s").

 

 

 

OPTICAL ERR

No optical connection.

Ensure that both transmit and receive fiber connections on

LED is ON

 

the local and remote units are connected properly.

 

 

 

 

Optical budget is too low

Measure the optical loss over the fiber link and verify that it

 

 

meets the product specifications.

 

 

 

OPTICAL AIS

The equipment attached to

Check the remote attached equipment transmission.

LED is ON

the remote unit is transmitting

 

 

“All 1s" string

 

 

 

 

 

The remote unit detected

Check the remote unit and the remote attached equipment

 

Electrical Low alert

for possible fault.

 

 

 

Troubleshooting Instructions

4-3

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RAD Data comm E1, T1 Troubleshooting Instructions, Troubleshooting Chart, Symptom Probable Causes Corrective Measures, Off

T1, E1 specifications

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