Alarm Out Connector - Allied Telesis AT-IE300-12GP Installation Manual

Alarm Out Connector

The 2-pin Alarm Out connector on the top panel of the switch is for an
external alert device. The switch can use the device to alert you to alarm
conditions, such as power supply failures or ports without links. Here are
two examples of alert devices for the Alarm Out connector:
LEDs

Buzzers

The switch does not supply power on the Alarm Out circuit. Instead, the
circuit is an on or off dry contact relay. When an alarm occurs, the switch
changes the circuit from closed (on) to open (off). The circuit remains open
until the alarm is resolved, at which point the switch automatically closes it
again. The processes to resolving alarms can vary.
The external alert device has to provide the necessary power for the circuit
and be able to monitor the circuit for when it is closed or open. Here are
the power specifications for the circuit:
30VDC maximum

0.5A maximum

Caution
The external alert device must not exceed the above specifications.
The Alarm Out connector can be damaged by devices that exceed
the specifications.
You use the ALARM FACILITY RELAY command to specify the alarm
condition that opens the Alarm Out circuit. Examples of alarm conditions
are power supply failures, ports without links, and loop detections. For
instructions on the command, refer to the Software Reference for IE300
Series Switches.
An example of the feature is illustrated in Figure 7 on page 40. The Alarm
Out connector is attached to a blue LED alert device. The alert device is
configured such that its LED is off when the circuit is closed and on when
the circuit is open.
Now assume you want the switch to open the circuit and activate the LED
on the alert device whenever any port on the switch does not have a link to
a network device. Here is the ALARM FACILITY RELAY command:
awplus(config)#alarm facility link-down port1.0.1-
port1.0.12 relay
If the switch detects that a port does not have a link, it changes the circuit
IE300 Series Installation Guide
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