502 Chapter 39 Hardware procedures
NN10600-175 6.1S2
Replacing the external alarm cable
Replace an external alarm cable if it fails to restore external alarm capability.
Prerequisites
• Ensure that you have made the alarm cable to suit your installation and
in accordance with the connector pinout information in NN10600-170
Nortel Networks Multiservice Switch 7400 Hardware Description.
• If you are using long cables, ensure that your alarm system is not
impeded by cable resistance.
Procedure steps
1 Disconnect the external alarm cable at Alarm 1 at the rear of the shelf
assembly. See the appropriate figure for the location of the cable:
• “Location of the alarm connector and cutoff control on a Multiservice
Switch” (page 503)
• “External alarm connector on a Multiservice Switch 7460” (page 504)
• “Dual alarm shelf interconnection between two Multiservice
Switch 7480s” (page 440)
2 Connect the replacement cable to the rear of the device. It connects only
one way. Ensure that the connector on the cable is the correct type,
gender, and orientation of the connector on the shelf.
3 Connect the other end of the cable to your remote alarm system.
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