Specifications

2240 Fiber Optic Modem

6. Diagnostic Procedures

6.1 2240 / 2201 Diagnostic Procedures

The following diagnostic procedures should be followed to test the 2240 system,

troubleshoot a defective link or detect a defective fiber optic cable, connector,

modem or power supply.

NOTE: Refer to the 2201 Rack Chassis / 2200R Redundant Modem

Card User Manual for diagnostic procedures for the 2201 Rack

Chassis and power supplies.

6.1.1 Required Equipment

1) Multimeter - for AC voltage, resistance and continuity tests

2) Fiber Optic Power Meter - should be calibrated atthe correct optical wave

length with the appropriate optical connectors

3) A short (one meter or less) fiber optic jumper cable consistent with the

modem optics under test, terminated with the appropriate connectors

4) A Bit Error Rate Tester (BERT) with the appropriate electrical interface and

cable

Step Symptom Possible Cause(s) Action

1 No power indicator No AC power Check AC

on front panel(s) power

source

2 No power indicator Defective modem Replace

on front panel(s) Modem

NOTE: Once any power system problems have been corrected,

continue the system checkout after the Loopback Diagnostic

Procedure.