Allied Telesis AT-S102 - Manual (Page 62)

Chapter 3: OAM-based Features
62
Dying Gasp and First RPS Failure Signals
The dying gasp and the first RPS failure are signals that the AT-CM Line
Cards automatically transmit on their fiber optic ports to notify you of
power supply problems with the AT-CV1203 Chassis. They indicate either
that a chassis has lost all power and has stopped functioning, or, if a
chassis has both a primary and a redundant power supply module, that
just one of the modules has lost power.
The remote AT-CM Line Cards send the signals to their local line card
counterparts in the AT-CV5000 at the central office, where the signals are
stored in the event log on the AT-CV5M02 Management Card and are
transmitted as SNMP traps to alert you to the events.
The signals are:
ˆ Dying gasp - The AT-CM Line Cards send this signal if the AT-CV1203
Chassis loses all power.
ˆ First RPS failure - The line cards send this signal if the AT-CV1203
Chassis has two power adapters and just one of the adapters loses
power.
The signals, along with their rules and restrictions, are described in the
following subsections.
Dying Gasp
The AT-CM Line Cards send this signal if they detect that the AT-CV1203
Chassis has just lost all power. Just before shutting down, the line cards
transmit the signal from their fiber optic ports to their line card counterparts
in the AT-CV5000 Chassis.
The process is illustrated in Figure 8. When the remote AT-CV1203
Chassis loses power, the AT-CM Line Card in the chassis transmits the
dying gasp signal from Port A over its fiber optic link to its line card
counterpart in the AT-CV5000 Chassis at the central office. The local card
sends the signal over the chassis’ backplane to the management card
which enters the event in its event log and sends an SNMP trap to alert
you to the problem.