FOM-E1/T1 Ver. 2.0
Detecting Errors
4-1
Chapter 4
Troubleshooting and
Diagnostics
This chapter describes the following FOM-E1/T1 diagnostic functions:
•
Front panel LED indicators
•
Alarm relays
•
Diagnostic loopbacks.
The chapter also provides tips on troubleshooting and frequently asked
questions.
4.1 Detecting
Errors
Front Panel LEDs
The front panel LED indicators indicate the status of the FOM-E1/T1. For a
description of LED indicators and their functions, see
Chapter 3
.
Alarm Relays
FOM-E1/T1 has dry contact alarm relays. The following fault conditions trigger the
major and minor alarm relays:
•
A major alarm is initiated when E1/T1 electrical input drops below G.703
electrical levels, or the bit error rate at the fiber optic interface is higher than
10
-6
.
•
A minor alarms occurs when an Alarm Indication Signal (AIS) is received at the
E1/T1 electrical or fiber optic interfaces.
For information on the DB-9 connector pins used for the alarm relays, see
Appendix A
, table A-2.
When connecting an external alarm-monitoring device, do not exceed the
maximum rating of the alarm relay contacts (1A, 60 VDC, 30 VAC).
Note