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FOM-E3, FOM-T3 Ver. 1.0 Alarm Relay 4-1

Chapter 4

Diagnostics and

Troubleshooting

4.1 Alarm Relay

FOM-E3 and FOM-T3 include a dry contact alarm relay port with a 9-pin connector

for sensing major and minor alarms.

• Major alarms are initiated when E3/T3 electrical input becomes lower than

G.703 electrical levels, or bit error rate at the fiber optic interface is 10

-6

worse.

• Minor alarms occur when an alarm indication signal (AIS) is received at the

E3/T3 electrical or fiber optic interfaces.

The dry contact port is normally open or normally closed depending on different

pins of the alarm relay port connector (see

Figure 4-1

Alarm Connector

Minor-NO

Major-NO

Major Alarm Relay

Minor Alarm Relay

Minor-NC

Major-NC

Minor-COM

Major-COM

Figure 4-1. Alarm Relay Connector Pinout

The relay positions are shown in the non-energized state (alarm active).

Note

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