Safety With Electricity - Cisco ASR 903 Installation Manual

Preparing for Installation
Warning
Do not stare into the beam or view it directly with optical instruments. Statement 1011
Warning Invisible laser radiation present. Statement 1016
Warning Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF or ON.
To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end
away from the unit first. Statement 1026
Warning Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous voltages
and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt other
equipment; and they direct the flow of cooling air through the chassis. Do not operate the system unless all
cards, faceplates, front covers, and rear covers are in place. Statement 1029
Warning Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when
servicing. Statement 1034
Warning
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or
view directly with optical instruments. Statement 1051

Safety with Electricity

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. Statement 12
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. Statement 43
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
Safety with Electricity
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