When an alarm is raised, the following happens:
- The action for the group associated with this alarm and severity is
checked. If a call should be placed, a timer is set for 5 minutes (to allow
the system to resolve the alarm automatically).
- After 5 minutes, if a call is still required, it will be placed.
- If the result of the call is an acknowledgment from INADS, all groups with
alarms will be treated as acknowledged, and no further action is needed.
Any subsequent alarm(s) raised in any of the already acknowledged
categories (of the same or lower level) do not cause another call to be
- If the call fails for any reason, it will be rescheduled and attempted at a
later time. Possible reasons for failure include:
— INADS not prepared for call or having problems
— Maintenance port already in use
— Dial string incorrect
— Modem problems
Three failures in a row cause the failure modes (from the screen) to be
examined and relays to be closed if so administered. Calls will still be
attempted as per the retry strategy.
Business Telephone Systems
If administered, alarm origination will place a call informing INADS that all
previously acknowledged alarms have been resolved. No All Clear call will be
placed if there are active alarms outstanding in groups that are administered to
place calls. For example:
- An alarm is raised for group 1, and a call is placed and acknowledged.
The Alarm is subsequently resolved. An All Clear call is scheduled. If a
new alarm is raised in group 1 before the All Clear call is placed, the All
Clear call will be canceled, and no new alarm call will be scheduled.
(Unless the new alarm is at a higher severity).
- An alarm is raised for group 1, and a call is placed and acknowledged. An
alarm is raised for group 2, and the alarm call is not acknowledged. The
Alarm in group 1 is resolved. At this point, all acknowledged alarms have
been resolved, but no All Clear call will be placed, because of the active
group 2 alarm. If a resolution for the group 2 alarm is received (before or
after it is acknowledged) an All Clear call will be placed.
Alarm Origination may be temporarily suppressed by entering the command
disable alarm-origination. During suppression, no calls (other than test calls)
will be attempted, nor will the relays be operated. Alarm origination would
typically be suppressed after logging in through the maintenance port so that no
outgoing calls are attempted while the port is busy. Alarm or All Clear calls will be
delayed until alarm origination is again enabled.
Since the possibility exists that whoever had suppressed alarm origination may
fail to re-enable it, it will be automatically re-enabled whenever the login that
originally suppressed it logs off.
Alarm Origination Not Active
Even if alarm origination is not active (the feature is turned off as opposed to
temporarily suppressed), the relays will still operate. When alarms are raised, the
action to take for the particular group (and severity) will be examined. If the
action is to close the relays, they will be closed. If the action to take is to call, the
failure mode will be examined. If the failure mode indicates the relays should be
closed, this will occur immediately. Therefore, turning off the feature will not stop
operations of the relays, unless administered otherwise.
Partner Phone System |Phone Equipment