Nortel DMS-500 - Visual alarm indications and manual controls

Version 2 Enhanced Alarm System 4-5
DMS-100 Family Alarm System Description Reference Manual BASE12
The main audible alarm panel contains the following signaling devices:
• critical bell, a loud bell that indicates the following alarm conditions:
— dead system alarm,
— critical DMS system equipment failure
— critical DMS power plant failure
— critical system or power plant failure in another system (if alarm
grouping is active)
• major chime, a loud tone bar struck at 60 IPM (interruptions per minute)
signaling, that indicate the following alarm conditions:
— major DMS system failure
— major DMS power plant failure
— frame supervisory panel (FSP) alarm on any equipment aisle
— major equipment failure in another system (if alarm grouping is
active)
• alarm battery subset, a loud telephone ringer (two bells with resonators),
that indicates the following alarm conditions:
— alarm battery supply failure at a PDC
— battery failure at the OAU or standby MTM
— failure of an internal supply circuit at the OAU or standby MTM
(130 V supply or 20-Hz ac ringing supply)
— a loss of communication between CC and the OAU or standby MTM
• minor alarm subset - a loud telephone ringer (two bells without
resonators) that indicates the following alarm conditions:
— minor DMS system equipment failure
— minor DMS power plant failure
— minor equipment failure in another system (if alarm grouping is
active)
— incoming call on a 101 communication test line at the TTC (if night
alarm transfer is active)
The TTC audible alarm panel provides a TTC chime that signals an
incoming call on a 101 communication test line.
Visual alarm indications and manual controls
The OAS hardware includes a number of devices that provide visual alarm
indications and manual controls. These devices are in addition to the UI
(User Interface) for system- and hardware-detected alarms. The VDU