Allied Telesis SwitchBlade 4000 Series Switch Hardware Reference - Manual (Page 32)

32 SwitchBlade 4000 Series Switch
C613-03060-00 REV H
Alarm Relays and Monitoring
This section provides an introduction to the SwitchBlade’s alarm and
monitoring capabilities. All SwitchBlade chassis have two alarm relays on their
rear panel, and extensive software-based logging, SNMP trap, and trigger
monitoring capability.
Alarm Relays
The SwitchBlade’s two alarm relays (“Major” and “Minor”) can be configured
to operate when a number of different environmental and operational events
occur. Users can choose which relay (major or minor) operates for a specific
event. The relays do not operate by default, they will only operate if
specifically configured to do so.
The relays are designed to operate in DC circuits. When placed in these circuits
the relays can operate external alarm devices such as small alarms, lights, or
larger relays. If connecting the relays to a 12VDC circuit, they can switch 1
amp. If connecting the relays to a 48VDC circuit, they can switch 0.5 amp. The
relays have normally open (N/O) and normally closed (N/C) contact options.
Connecting the relays to an AC circuit is likely to damage the relays and switch.
Table 1 on page 32 lists the events that can operate alarms. Refer to
“Environmental Monitoring” on page 4-15 of Chapter 4, Configuring and
Monitoring the System for information on configuring alarm relays, including
complete command descriptions.
Table 1: Alarm and monitoring events.
Event Description
Fan tray presence Initiates an alarm event if a fan tray is removed for more
than 20 seconds. Initiates a monitoring event when a fan
tray is removed.
Fan tray fan status Initiates alarm and or monitoring events when a fan tray fan
fault is detected.
Fixed CPU high temperature Initiates alarm and or monitoring events if CPU temperature
rises above 90º C (194º F). Temperature is measured at the
master switch controller CPU and slave switch controller
CPU.
Settable CPU Temperature Initiates alarm and or monitoring events if CPU temperature
rises above a value defined by the user. Temperature is
measured at the master switch controller CPU and slave
switch controller CPU.
ALARM RELAYS
MINOR ALARM
N/O N/C
COMMON
MAJOR ALARM
N/O N/C
COMMON
, 1A
, 0.5A 12 VDC
48 VDC