Cisco XR 12406 - Manual (Page 84)

Chapter 2 Preparing for Installation
Installation Site Requirements
2-20
Cisco XR 12406 Router Installation Guide
OL-13831-01
Site Wiring
This section presents 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
EMI can occur between the signals on the wires and external or ambient EMI
fields when the wires are run for any significant distance. 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 12406 Router, can
create an electrical hazard by conducting power surges through lines, and can
damage the equipment.
To predict and remedy strong EMI, you may need to consult experts in radio-
frequency interference (RFI).
If you use twisted-pair cable in your plant wiring with a good distribution of
grounding conductors, the plant wiring is unlikely to emit radio interference. If
you exceed the recommended distances, use a high-quality twisted-pair cable with
one ground conductor for each data signal when applicable.