Allied Telesis AT-IFS802SP Switch User Manual


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36 AT-IFS802SP/POE(W)-80 User Manual
6.9 Fault Relay Alarm
The Fault Relay Alarm function provides the Power Failure and Port Link Down/Broken detection.
With both power input 1 and power input 2 installed and the check boxes of power 1/power 2 ticked,
the FAULT LED indicator will then be possible to light up when any one of the power failures occurs.
As for the Port Link Down/Broken detection, the FAULT LED indicator will light up when the port
failureoccurs;certainlythecheckboxbesidetheportmustbetickedrst.Pleaserefertothesegment
of‘Wiring the Fault Alarm Contact’ for the failure detection.
Power Failure• : Tick the check box to enable the function of lighting up the FAULT LED on the
panel when power fails.
Port Link Down/Broken• : Tick the check box to enable the function of lighting up FAULT LED
on the panel when Ports’ states are link down or broken.
Fault Relay Alarm interface
6.10SNTPConguration
SNTP(SimpleNetworkTimeProtocol)isasimpliedversionofNTPwhichisanInternetprotocolused
to synchronize the clocks of computers to some time reference. Because time usually just advances, the
time on different node stations will be different. With the communicating programs running on those
devices, it would cause time to jump forward and back, a non-desirable effect. Therefore, the switch
provides comprehensive mechanisms to access national time and frequency dissemination services,
organize the time-synchronization subnet and the local clock in each participating subnet peer.
Daylight saving time (DST) is the convention of advancing clocks so that afternoons have more daylight
and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are
adjusted backward in autumn.
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