Cisco 7206VXR Configuration Guide - Page 90

Site Requirement Guidelines Chapter 2 Preparing for Installation Power Connection Guidelines Follow these precautions and recommendations when planning power connections to a Cisco 7200 VXR router: • 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. 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 "Attaching a Chassis Ground Connection" section on page 3-17 in Chapter 3, "Installing a Cisco 7200 VXR Router.") 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: • 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. Note To predict and remedy strong EMI, you may also 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. Cisco 7200 VXR Installation and Configuration Guide 2-8 OL-5013-09