Cisco Systems 7401ASR manual Electrical Equipment Guidelines

Chapter 2 Rack-Mounting, Tabletop Installation, and Cabling

Preparing to Install the Cisco 7401ASR Router

•Grounding lug and wires:

–A grounding lug with two number-10 screw holes with a 0.63-inch (16.002-mm) spacing between them

–A wire receptacle large enough to accept a 6-AWG multistrand, copper wire

–Two Phillips machine screws with locking washers—M5 (metric), 0.031-inch (.08-mm) pitch, 0.315-inch (8-mm) length

–A crimping tool to fit the grounding lug wire receptacle

–One grounding wire—6-AWG, 0.162-inch (4.115-mm) diameter, with approximately 0.108-inch (2.743-mm) insulation, for a total wire diameter of approximately 0.27 inches (6.858 mm). The wire length depends on your router location and site environment.

In addition, you might need the following external equipment:

•Data service unit (DSU) to connect each serial port to an external network

•T1 channel service unit/data service unit (CSU/DSU) that converts the High-Level Data Link Control (HDLC) synchronous serial data stream into a T1 data stream with the correct framing and ones density to connect a serial port to a T1 network. (Some telephone systems require a minimum number of 1 bits per time unit in a data stream, called ones density.) Several T1 CSU/DSU devices are available as additional equipment, and most provide a V.35, EIA/TIA-449, or EIA-530 electrical interface.

•Ethernet transceiver

•Token Ring multistation access unit (MSAU)

•ESD-preventative wrist strap

•Power cord

•Appropriate cables to connect the router to the console and auxiliary ports

Electrical Equipment Guidelines

The port adapter is designed to be removed and replaced while the system is operating without presenting an electrical hazard or damage to the system.

Follow these basic guidelines when working with any electrical equipment:

•Before beginning any procedures requiring access to the chassis interior, locate the emergency power-off switch for the room in which you are working.

•Disconnect all power and external cables before moving a chassis.

•Do not work alone when potentially hazardous conditions exist.

•Never assume that power has been disconnected from a circuit; always check.

•Do not perform any action that creates a potential hazard or makes the equipment unsafe.

•Carefully examine your work area for possible hazards such as moist floors, ungrounded power extension cables, and missing safety grounds.

Cisco 7401ASR Installation and Configuration Guide

OL-5419-01 B0 2-3