Cisco 7200 VXR Series Manuel - Sayfa 8

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Site Requirement Guidelines

Power Connection Guidelines

Follow these precautions and recommendations when planning power connections to a Cisco 7200 VXR

router:

•

Note

The Cisco 7200 VXR router installation must comply with all applicable codes and is approved for use

with copper conductors only. The ground bond fastening hardware should be of compatible material and

preclude loosening, deterioration, and electrochemical corrosion of hardware and joined material.

Attachment of the chassis ground to a central office or other interior ground system should be made with

a 6-AWG, copper ground conductor at a minimum.

The Cisco 7200 VXR chassis employs two threaded M5 chassis grounding receptacles, located on the

rear of the chassis, which are intended to be bonded directly to the central offices or other interior ground

system. The chassis ground requires M5 screws and locking hardware, which are not included. (For

instructions on how to properly ground the chassis, see the

section on page 3-17

Plant Wiring Guidelines

Following are guidelines for setting up the plant wiring and cabling at your site. When planning the

location of the new system, consider the distance limitations for signaling, EMI, and connector

compatibility, as described in the following sections.

Interference Considerations

When wires are run for any significant distance in an electromagnetic field, interference can occur

between the field and the signals on the wires. This fact has two implications for the construction of plant

wiring:

•

To predict and remedy strong EMI, you may also need to consult experts in radio frequency interference

Note

(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.

Cisco 7200 VXR Installation and Configuration Guide

2-8

Check the power at your site before installation and periodically after installation to ensure that you

are receiving clean power. Install a power conditioner if necessary.

Install proper grounding to avoid damage from lightning and power surges.

Chapter 3, "Installing a Cisco 7200 VXR

Bad wiring practice can result in radio interference emanating from the plant wiring.

Strong EMI, especially when it is caused by lightning or radio transmitters, can destroy the signal

drivers and receivers in the Cisco 7200 VXR routers, and can even create an electrical hazard by

conducting power surges through lines and into equipment.

Chapter 2

Preparing for Installation

"Attaching a Chassis Ground Connection"

Router.")

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