21/1531-ASP11301 Uen B3 2016-02-17
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A
LARMS
5
ALARMS
General alarms can be monitored in several ways depending on how the system is
configured.
In systems with MX-ONE Lite, the MGU boards can supervise several alarms, both
external and internal in the unit. The alarm input of MX-ONE Lite connects input A and
B to the backplane. The MGU boards can then be configured to supervise these alarm
inputs.
In systems with MX-ONE Classic (7U-chassis) and MGU boards, the simplest way is
to use the alarm input on the DC/DC-board and configure the MGU boards to monitor
Alarm A and/or Alarm B input.
When many external alarm shall be monitored or when system is not equipped with
MGU boards, an ALU2 board can be used. The ALU2 board can receive up to eight
different alarm signals and send out up to seven control signals. See Figure 34: ALU2
- MDF connections on page 43.
If more in- or out- signals are required, the number of ALU2 boards can be increased.
Alarm indications are normally transferred to the PBX operator consoles when using
ALU2.
A internal power failure alarm for 5V DC is monitored by the MGU board.