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Cisco MWR 1900 Mobile Wireless Edge Router Hardware Installation Guide
78-13982-02
Chapter 2 Preparing to Install the Router
Safety Recommendations
Safety with Electricity
Warning
Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel
board that services the DC circuit, switch the circuit breaker to the OFF position, and
tape the switch handle of the circuit breaker in the OFF position.
Warning
This unit is intended for installation in restricted access areas. A restricted access area
is where access can only be gained by service personnel through the use of a special
tool, lock and key, or other means of security, and is controlled by the authority
responsible for the location.
Warning
The Ethernet 10/100BaseT, Token Ring, serial, console, and auxiliary ports contain safety
extra-low voltage (SELV) circuits. BRI circuits are treated like telephone-network
voltage (TNV) circuits. Avoid connecting SELV circuits to TNV circuits.
Warning
Before working on equipment that is connected to power lines, remove jewelry
(including rings, necklaces, and watches). Metal objects will heat up when connected
to power and ground and can cause serious burns or weld the metal object to the
terminals.
Warning
Before working on a chassis or working near power supplies, unplug the power cord on
AC units; disconnect the power at the circuit breaker on DC units.
Follow these guidelines when working on equipment powered by electricity:
• Locate the room’s emergency power-OFF switch. Then, if an electrical accident occurs, you can
quickly shut the power OFF.
• Before working on the system, turn the DC main circuit breaker off and disconnect the power
cord/terminal block cable.
• Disconnect all power before doing the following:
–
Working on or near power supplies
–
Installing or removing a router chassis or network processor module
–
Performing most hardware upgrades
• Do not work alone if potentially hazardous conditions exist.
• Look carefully for possible hazards in your work area, such as moist floors, ungrounded power
extension cables, and missing safety grounds.
• Never assume that power is disconnected from a circuit. Always check.
• If an electrical accident occurs, proceed as follows:
–
Use caution, and do not become a victim yourself.
–
Turn OFF power to the system.