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Cisco VG248 Analog Phone Gateway Hardware Installation Guide
78-13154-01
Chapter 2 Preparing to Install the VG248
Installing, Servicing, or Disposing the System
• Do not touch the backplane or midplane with your hand or metal tools.
• Remove all jewelry (including rings and chains) or other items that could get
caught in the system or heat up and cause serious burns.
Disconnecting Power
• Locate the emergency power-off switch for the room before working with the
system.
• Disconnect power from the circuit by unplugging the power cord when
working near the system backplane or midplane.
• To completely de-energize the system, disconnect the power connection to all
power supplies.
• Do not touch the power supply when the power cord is connected.
Preventing EMI
When you run wires for any significant distance in an electromagnetic field,
electromagnetic interference (EMI) can occur between the field and the signals on
the wires.
Note that:
• Bad plant wiring can result in radio frequency interference (RFI).
• Strong EMI, especially when it is caused by lightning or radio transmitters,
can destroy the signal drivers and receivers in the system, and can even create
an electrical hazard by conducting power surges through lines and into the
system.
To predict and remedy strong EMI, consult RFI experts.
Disposing of the System
Dispose of the system and its components (including batteries) as specified by all
national laws and regulations.
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