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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 — —