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Safety Requirements
Before opening the chassis, disconnect the telephone-network cables to avoid contact with
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telephone-network voltages.
Do not work on the system or connect or disconnect cables during periods of lightning activity.
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Read the installation instructions before you connect the system to its power source.
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For personal safety, the ground wire must connect to safety (earth) ground at both the equipment and
supply side of the DC wiring (unless the local electrical code requirements are different).
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Incorrect connection of this or connected equipment to a general purpose outlet could result in a
hazardous situation.
Do not touch the power supply when the power cord is connected. For systems with a power switch,
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line voltages are present within the power supply even when the power switch is off and the power
cord is connected. For systems without a power switch, line voltages are present within the power
supply when the power cord is connected.
Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.
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The power supply circuitry for the equipment can constitute an energy hazard. Before you install or
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replace the equipment, remove all jewelry (including rings, necklaces, and watches). Metal objects
can come into contact with exposed power supply wiring or circuitry inside the DSLAM equipment.
This could cause the metal objects to heat up and cause serious burns or weld the metal object to the
equipment.
The customer 48 volt power system must provide reinforced insulation between the primary AC power
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and the 48 VDC output.
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Hold the PEM by the sheet-metal carrier (top and front) only. Internal components may be hot.
Before working on a chassis or working near power supplies, unplug the power cord on AC units;
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disconnect the power at the circuit breaker on DC units.
Care must be given to connecting units to the supply circuit so that wiring is not overloaded.
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Cisco 6260 Hardware Installation Guide
2-4
Chapter 2
Preparing for Installation
OL-2365-02
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