Artesyn AXP640, Installation And Use Manual

Page: 182 / 190

Shelf Management Alarm Module
AXP640 Installation and Use (6806800M24F )
182
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When the Active SAM receives a switchover command from the Standby SAM and agrees
to switchover, it closes the TCP connection, clears the LOCAL_HEALTHY bit and exits the
program which indicates the switchover to the Standby SAM.
If the Standby SAM decides that a switchover should take place it closes the TCP
connection and exits this function. Activate callbacks are called for all facilities and the
SAM starts to work in active mode, with no backup. At this moment the SAM sets the
LOCAL_SWITCHOVER bit, requesting the hardware to recognize it as the Active SAM. In
response, the hardware must set the ACTIVE bit. When the formerly active SAM restarts it
successfully establishes the connection with the current SAM and starts to operate in the
backup mode.
7.6 Telco Alarm Functionality
The AXP640 provides Telco alarm functionality with the following components:
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DB15 Telco alarm contacts located on the rear of the chassis
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Telco alarm LEDs located on the SAM faceplate
7.6.1 Telco Alarm LEDs
These LEDs are used to indicate the presence of the critical, major, and minor alarms. When a
LED is lit, the respective alarm is active. A blinking LED signals an alarm cut-off state.
7.6.2 Telco Alarm Interface
The alarm connection, which is a standard DB-15 connector located on the upper right side of
the rear of the AXP640 shelf. The DB-15 connector has the following pin assignments:
Table 7-8 Hot Swap Interface Pin Out
Pin Description
1 Minor Alarm Reset +
2 Minor Alarm Reset -
3 Major Alarm Reset +
4 Major Alarm Reset -