Release TR3.2.1
Turin Networks
Page 3-1
SECTION 3ALARM, TIMING, AND MANAGEMENT INTERFACE SPECIFICATIONS
Chapter 1
Alarm Interface Specifications
Introduction
This chapter includes the following topics:
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Environmental Alarm Wire-Wrap Posts and EAM
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Environmental Alarm Input Contacts
Alarm Interface
Description
The General Control Module (GCM) card generates Traverse system alarm signals and
provides the common (COM), normally-open (NO) and normally-closed
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contacts
through individual relays. The Traverse system supports standard system critical,
major, minor; visual and audible alarms. Access to system alarm contacts is provided
via wire-wrap posts located on the Traverse 1600, Traverse 2000, and Traverse 600
main backplanes.
Normally-open Contacts
System alarms operate by default using the COM and NO contacts. When an alarm
state occurs, the circuit between the COM and NO contacts is closed generating a
visual or audible alarm. Alarm contacts are bridged between the active and standby
GCMs. A single GCM is capable of generating and maintaining system alarms if the
standby GCM is out of service.
Fail-safe Alarm
All system alarms are masked and a fail-safe alarm is generated if both GCMs go
out-of-service. The fail-safe alarm is the only normally-closed alarm. The fail-safe
alarm is generated when GCMs are installed and operational, and then go into an
out-of-service state. The fail-safe alarm is also generated when both GCMs are
physically removed from the Traverse shelf.
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Normally-closed contacts are not currently supported.
