Office Alarm System Version 1; Version 1 Oas Hardware And Alarm Indication Devices; Office Alarm Unit - Nortel DMS-100 Series Reference Manual

Office Alarm System Version 1

This chapter contains information on Office Alarm System (OAS) Version 1.
Chapter 6 describes the OAS alarms, and alarm and control circuits.

Version 1 OAS hardware and alarm indication devices

The following sections provide information on the main hardware
components of the Version 1 OAS and the alarm indication devices mounted
on these components.

Office alarm unit

In the Version 1 OAS, the office alarm unit (OAU) and the standby
maintenance trunk module (MTM) contain most of the alarm detection and
control hardware. The OAU is dedicated to the alarm system. The standby
MTM contains the alarm system backup circuits that generate an alarm if the
OAU fails. The standby MTM also contains equipment, such as service and
test circuits, that is not part of the alarm system. The OAU and standby
MTM use the message system to communicate with the alarm system
software in central control (CC).
The OAU is an MTM shelf equipped with a transmission, a processor, a
control, and a power converter card. The OAU also contains the following
cards:
The interface card slots in the Version 1 OAU contain the following cards:
three signal distribution cards (NT2X57) that provide an interface
between the alarm system software and relay-controlled equipment in
the OAU. These cards activate audible and visual alarms or other related
circuits.
three to five miscellaneous scan detector cards (NT0X10). The size of
the office determines the number of these cards required. The alarm
system software uses the scan detector cards to monitor the status of the
alarm system hardware. The alarm system software also uses the scan
detector cards to detect alarm conditions or the operation of
manual-control switches.
DMS-100 Family Alarm System Description Reference Manual BASE12
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