B-10
Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Appendix
External Alarm Cabling
Alarm Connector Pin Assignments
Table B-8
describes the Alarm connector pin assignments for the different MGX multiservice switches.
Connector Pin Functions for Audio and Visual Alarms
Table B-9
shows the pin numbers and functions on the ALARM connector on the PXM-UI-S3 and
PXM-UI-S3/B user interface back card.
•
When Audio Alarm is enabled, the Audio Alarm On and Audio Alarm Common pins are closed
(short circuit).
•
When Audio Alarm is disabled, the Audio Alarm On and Audio Alarm Common pins are opened
(open circuit).
•
When Visual Alarm is enabled, the Visual Alarm On and Visual Alarm Common pins are closed,
and the Visual Alarm Off pin is opened.
•
When Visual Alarm is disabled, the Visual Alarm Off and Visual Alarm Common pins are closed,
and the Visual Alarm On pin is opened.
Table B-8
Pin Assignments for the DB-15 ALARM Connector
MGX 8850 (PXM1/PXM45), MGX 8850/B,
MGX 8950 Only
MGX 8830, MGX 8830/B Only
Pin # Alarm
Description
Pin # Alarm
Description
1
Audible—critical Normally on
1
Audible—Major
Normally open
2
Visual—critical
Normally on
2
Common
3
Visual—critical
Normally off
3
Audible—Minor
Normally open
4
Audible—major
Common
4
Visual—Major
Normally open
5
Visual—major
Common
5
Common
6
Audible—minor
Normally on
6
Visual—Minor
Normally open
7
Visual—minor
Normally on
7
unused
n.c.
8
Visual—minor
Normally off
8
unused
n.c.
9
Visual—critical
Normally off
9
Normally closed
10
Visual—critical
Common
10
Normally closed
11
Audible—major
Normally on
11
Common
12
Visual—minor
Normally on
12
Normally closed
13
Visual—major
Normally off
13
Normally closed
14
Audible—minor
Common
14
Common
15
Visual—minor
Common
15
unused
n.c.
Table B-9
PXM-UI-S3 Pin Assignment on the ALARM Connector
Pin Name
Pin No.
Audio Enable
Audio Disable
Visual Enable
Visual Disable
Critical Audio Alarm On
1
S
1
O
2
—
—
Critical Audio Alarm Common
9
Common
Common
—
—