B-9
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
Step3 Use a wire-wrapping tool to wrap the shield drain wire to the ground pin (pi n 3 or 6) of the adapter. The
shield drain wire is the bare wire shown in FigureB-5.
FigureB-5 Wires Wire-Wrapped to Pins
Step4 Use a wire-wrapping tool to wrap the two remaining wires to the pin of the adapter.
Step5 Slide the pin cover over the pins and onto the body of the ad apter after all of the wires are connected.
Step6 Insert the RJ-45 connector of the adapter into the EXT CLK1 or EXT CLK2 port on the PX M-UI-S3 or
PXM-UI-S3/B.
Step7 If the faceplate of the PXM-UI-S3 or PXM-UI-S3/B has a mating tapped hole, hand tighten the
strain-relief screw to provide additional strain relief.
Step8 Connect the opposite end of the shielded cable to the external BITS clock source.
External Alarm Cabling
The network alarm cable connects to the ALARM connector on th e PXM-UI-S3 or PXM-UI-S3/B user
interface card.

Alarm Cable Information

This section describes cables, connectors, and pin assignments for network alarm cabling.

Alarm Cable Information for MGX Switches

Table B -7 describes the Alarm cable used for the MGX 8850 (PXM1E/PXM45), MGX 8850/B,
MGX 8950, MGX 8830 and MGX 8830/B switches.
5
6
7
8
53281
1
2
3
4
TableB-7 External Alarm Cable and Connector Information for MGX Switches
Cable Parameter Description
Interface Dry-contact relay closure
Wire 24 AWG, shielded, 6-pair
Connector DB-15, subminiature, male