Mtm Alarm System Circuits; Alarm Cross-Connect Unit Panel; Audible Alarms - Nortel DMS-100 Series Reference Manual

4-4 Version 2 Enhanced Alarm System
In the EAS OAU, the NT3X82AC and AD cards replace the NT3X82AA
and AB cards. These new cards are backward compatible and provide the
additional features listed above. The NT3X82AA and NT3X82AB cards do
not provide these features.
Chapter 3 lists the features common to the AA, AB, AC, and AD versions of
the NT3X82 card.

MTM alarm system circuits

In the EAS, the OAU and standby MTM must obtain power from feeds other
than A or B. The OAU and standby MTM must be powered by two
additional feeds (C and D) that are separate from the standard A and B
feeds.

Alarm cross-connect unit panel

You must use the NT3X89AB, NT3X89BA, or NT3X89CA alarm
cross-connect unit (AXU) panel for the EAS. These AXU panels are
physically the same as the NT3X89AA, except for the wiring changes to
support the additional EAS functions.
The NT3X89CA is a modernized version of the NT3X89AB. The
NT3X89CA uses the following daughter boards for the data loop control
(DLC) function:
The DLC function is not available on the NT3X89BA (–60V) panel.

Audible alarms

The activation of the audible alarms can be on-site or the remote alarm
transfer circuit can transfer the audible alarms to a remote monitoring
location. For more information on audible alarms and alarm circuits, see
Chapter 6. The on-site audible signaling devices mount on two audible
alarm panels. One panel, the NT0X66, is the main audible alarm panel for
DMS-100 Family switches. The other panel, the NT0X61, is the optional
TTC audible alarm panel for the trunk test center (TTC) in toll offices.
Normally, an office contains a maximum of two main audible alarm panels.
Office size and configuration determine the number of main audible alarm
panels used. For example, you use an additional audible alarm panel for a
DMS power plant located on another floor. Extended audible alarm
capability is also available. For more information, see Alarm extension
circuits section later this chapter. The audible alarm panels are wall- or
column-mounted.
297–1001–122 Standard 06.01 August 1999
NT3X8906 for –48V applications
NT3X8907 for –60V applications