Cisco XR 12404 - Manual (Page 61)

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Cisco XR 12404 Router Installation Guide
OL-13830-02
Chapter 2 Preparing for Installation
Installation Site Requirements
• Install an uninterruptable power source where possible.
Grounding Connections
Before you connect power or turn on your Cisco XR 12404 Router, you must
provide an adequate system ground for the router. The equipment grounding
should be in accordance with local and national electrical codes.
For installations other than in a network equipment building system (NEBS)
environment, you may chose to rely on the safety earth ground connection
supplied via the International Electrotechnical Commission (IEC) 320 inlets for
AC-powered units and the main terminal block ground connection for
DC-powered units.
Site Wiring
This section offers site wiring guidelines for setting up the plant wiring and
cabling at your site. When planning the location of the new system, consider the
following:
• Electromagnetic interference (EMI)
• Distance limitations for signaling and unshielded conductors
Electromagnetic Interference
Electromagnetic interference can occur between the signal on the wires and
external or ambient EMI fields when the wires are run for any significant distance.
This fact has two implications for the construction of plant wiring.
• Bad wiring practice can result in radio interference emanating from the plant
wiring.
Warning Strong EMI, especially when it is caused by lightning or radio transmitters, can
destroy the signal drivers and receivers in the Cisco XR 12404 Router, and can
create an electrical hazard by conducting power surges through lines and may
cause damage to the equipment.
todd.book Page 15 Monday, March 16, 2009 2:47 PM