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Chapter 1: Overview
34
Power from an external power source is required for an external alert
device which is activated when the P-Fail alarm relay contacts are closed.
Here are the contact rating specifications for the P-Fail alarm relay:
24VDC maximum
1.0A maximum
Caution
The power supplied to the P-Fail alarm relay contacts must not
exceed the above specifications. The contacts can be damaged if
these specifications are exceeded.
You can specify the type of Alarm policy that will activate the P-Fail alarm
relay contacts when the fault is detected within the IS230-10GP switch
management software. Examples of alarm conditions are power supply
failures, fiber alarms, and port alarms.
An example of the feature is illustrated in Figure 4. The P-Fail alarm relay
contacts are attached to a LED alert device. The alert device is configured
such that its LED is off when the circuit is open and on when the circuit is
closed.
Now assume you want the switch to close 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. If the switch detects that a port does not have a link, it
changes the circuit from open to closed. The alert device, detecting the
change to the circuit, turns the LED on. When the switch detects that all its
ports have links again, it opens the circuit, which turns off the LED.
Note
External alarm devices are not available from Allied Telesis.
Figure 4. Example of the P-Fail Alarm Relay Circuit
LED
Circuit open - LED off
Circuit closed - LED on
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