User's Manual

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620003-0 Rev. A
PRELIMINARY Connecting Contact Alarms to a Unison System
6.7 Connecting Contact Alarms to a Unison System
The Unison Main Hub can generate (source) two contact alarms as well as sense an
external contact alarm.
• Alarm Source
The Main Hub has two alarm contacts, major and minor errors. These contacts are
normally-closed (NC) and will open when an internal alarm is detected.
• Major error is active when any faults or disconnects are detected.
• Minor error is active during a lockout or warning, or when the end-to-end sys-
tem test is not valid.
•Alarm Sense
The Main Hub can monitor an external alarm contact using this feature. The port
can be configured for normally-open (NO) or normally-closed (NC) contacts. The
interface expects a set of floating contacts. An external voltage source is not
required for this interface. AdminManager or OpsConsole is used to monitor the
port status.
The following table lists the alarm types, equipment that Unison is connected to,
cable(s) used, and the errors (major and/or minor) that are detected.
Note that only major errors are supported on MetroReach and LGCell, and that the
5-port Daisy-Chain Alarm Cable supports only major errors as well. Therefore, using
the 5-port Daisy-Chain Alarm Cable with equipment that supports both major and
minor errors will result in only major errors being detected. This is also the case when
using the Alarm Source Daisy-Chain Cable, which supports both major and minor
alarms, with MetroReach or LGCell because these systems only support major errors.
Alarm
Type
Unison
connected to Cable(s) Used Errors Detected
Source MetroReach 5-port Daisy-Chain Alarm Cable
and male-to-male adapter cable that
is provided with MetroReach
Major
Alarm Source Daisy-Chain Cable Major
Source BTS 5-port Daisy-Chain Alarm Cable Major
Alarm Source Daisy-Chain Cable Major and Minor
Source ARM2000 Alarm Source Daisy-Chain Cable Major and Minor
Sense LGCell 5-port Daisy-Chain Alarm Cable
and the Alarm Sense Adapter Cable
Major
Alarm Source Daisy-Chain Cable
and the Alarm Sense Adapter Cable
Major