Cisco Systems MAS-7K, MAS-7507, CHAS-7507, CHAS-7K Cable Strain Relief, Safety with Electricity

Prerequisites

Safety with Electricity

Follow these basic guidelines when working with any electrical equipment:

•Before beginning any procedures, locate the emergency power-off switch for the room in which you are working.

•Never assume that power has been disconnected from a circuit; always check.

•Always disconnect all cables (including network interface and telephone wiring) and remove all power supplies before moving or lifting the chassis.

Warning Always disconnect all cables before moving or working on the chassis. Even when the chassis is disconnected from all power sources, telephone wiring can still deliver potentially lethal electrical surges.

•Never install telephone wiring during a lightning storm.

Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. (For translations of this safety warning, refer to the section “Lightning Activity Warning” on page 41.)

•Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.

•Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.

•Use caution when installing or modifying telephone lines.

Cable Strain Relief

If possible, position the new replacement chassis close enough to the existing system so that you can avoid having to disconnect power and interface cables. Be sure to disengage any strain relief devices before attempting to pull the cables from the port. Following are descriptions of the different methods of strain relief that are used on the power supplies and the various types of network interface ports:

•On the AC-input power supplies, a cable retention clip snaps up around the connector on the power cord to prevent it from being inadvertently pulled out of the power supply port. Before attempting to disconnect the power cord, be sure to push the retention clip down away from the cable connector.

•On the DC-input power supplies, two nylon cable ties provide strain relief for the DC-input cables.

•Serial interface cables (all types) use thumbscrews on the cable connectors that secure the cable to the FSIP port.

•Ethernet interface cables use either slide-type locks or thumbscrews. The Ethernet Interface Processor (EIP) ports are shipped from the factory with slide-type locks on each port; however, a conversion kit is also shipped for replacing the slide-type locks with jackscrews to accommodate Ethernet interface cables with thumbscrews.

Cisco 7000 and Cisco 7507 Chassis Replacement Instructions 9