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

Chapter 4

Diagnostics and

Troubleshooting

4.1 Alarm Relay

FOM-E3/ETH and FOM-T3/ETH include a dry contact alarm relay port supported via

9-pin connector for major and minor alarms.

• Major alarms are initiated bit error rate at the fiber optic interface is 10

-6

worse.

• Minor alarms occur when an Alarm Indication Signal is received at the fiber

optic interface.

The dry contact port operates as Normally Open or Normally Closed, using

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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RAD Data comm FOM-T3 Spécifications Page 35