Cisco 2524 - Router - EN Foglio di istruzioni

CHAPTER

Preparing to Install the Cisco 2524 and Cisco 2525 Routers 2-1

Preparing to Install the

Cisco 2524 and Cisco 2525

Routers

This chapter describes the tasks you must perform before you begin to install the

Cisco 2524 and Cisco 2525 routers, and includes the following sections:

•Safety Recommendations

•General Site Requirements

•Installation Checklist

•Creating a Site Log

•Preparing to Connect to a Network

•Inspecting the System

Safety Recommendations

Follow these guidelines to ensure general safety:

•Keep the chassis area clear and dust-free during and after installation.

•Put the removed chassis cover in a safe place.

•Keep tools away from walk areas where you and others could fall over them.

•Do not wear loose clothing that could get caught in the chassis. Fasten your tie or scarf

and roll up your sleeves.

•Wear safety glasses if you are working under any conditions that might be hazardous to

your eyes.

•Do not perform any action that creates a potential hazard to people or makes the

equipment unsafe.

2-2 Cisco 2524 and Cisco 2525 Router User Guide

Safety Recommendations

Warning Ultimate disposal of this product should be handled according to all national

laws and regulations. (To see translated versions of this warning, refer to the appendix

“Translated Safety Warnings.”)

Maintaining Safety with Electricity

Follow these guidelines when working on equipment powered by electricity.

Warning Before working on equipment that is connected to power lines, remove jewelry

(including rings, necklaces, and watches). Metal objects will heat up when connected to

power and ground and can cause serious burns or can weld the metal object to the terminals.

(To see translated versions of this warning, refer to the appendix “Translated Safety

Warnings.”)

•Locate the emergency power-off switch for the room in which you are working. Then,

if an electrical accident occurs, you can act quickly to turn off the power.

•Disconnect all power by turning off the power and unplugging the power cord before

doing the following:

—Installing or removing a chassis

—Working near power supplies

Warning When installing the unit, the ground connection must always be made first and

disconnected last. (To see translated versions of this warning, refer to the appendix

“Translated Safety Warnings.”)

•Do not work alone if potentially hazardous conditions exist.

•Never assume that power is disconnected from a circuit. Always check.

Preparing to Install the Cisco 2524 and Cisco 2525 Routers 2-3

Safety Recommendations

Warning Read the installation instructions before you connect the system to its power

source. (To see translated versions of this warning, refer to the appendix “Translated Safety

Warnings.”)

•Look carefully for possible hazards in your work area, such as moist floors, ungrounded

power extension cables, frayed power cords, and missing safety grounds.

•If an electrical accident occurs, proceed as follows:

—Use caution; do not become a victim yourself.

—Turn off power to the system.

—If possible, send another person to get medical aid. Otherwise, assess the condition

of the victim and then call for help.

—Determine if the person needs rescue breathing or external cardiac compressions;

then take appropriate action.

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. ESD

damage occurs when electronic components are improperly handled and can result in

complete or intermittent failures.

Always follow ESD-prevention procedures when removing and replacing components.

Ensure that the chassis is electrically connected to earth ground. Wear an ESD-preventive

wrist strap, ensuring that it makes good skin contact. Connect the grounding clip to an

unpainted surface of the chassis frame to safely ground unwanted ESD voltages. To

properly guard against ESD damage and shocks, the wrist strap and cord must operate

effectively. If no wrist strap is available, ground yourself by touching the metal part of the

chassis.

Caution For safety, periodically check the resistance value of the antistatic strap, which

should be between 1 and 10 megohms (Mohms).

2-4 Cisco 2524 and Cisco 2525 Router User Guide

General Site Requirements

This section describes the requirements your site must meet for safe installation and

operation of your system. Ensure that your site is properly prepared before beginning

installation.

Site Environment

The routers can be placed on a desktop or mounted in a rack or on a wall. The location of

the routers and the layout of your equipment rack or wiring room are extremely important

for proper system operation. Equipment placed too close together, inadequate ventilation,

and inaccessible panels can cause system malfunctions and shutdowns, and can make router

maintenance difficult.

When planning your site layout and equipment locations, keep in mind the precautions

described in the next section, “Preventive Site Configuration,” to help avoid equipment

failures and reduce the possibility of environmentally caused shutdowns. If you are

currently experiencing shutdowns or unusually high errors with your existing equipment,

these precautions may help you isolate the cause of failures and prevent future problems.

Preventive Site Configuration

The following precautions will help you plan an acceptable operating environment for your

router and will help you avoid environmentally caused equipment failures:

•Electrical equipment generates heat. Ambient air temperature might not be adequate to

cool equipment to acceptable operating temperatures without adequate circulation.

Ensure that the room in which you operate your system has adequate air circulation.

•Always follow the ESD-prevention procedures described in the section “Safety

Recommendations” earlier in this chapter to avoid damage to equipment. Damage from

static discharge can cause immediate or intermittent equipment failure.

•Ensure that the chassis cover is secure. The chassis is designed to allow cooling air to

flow effectively within it. An open chassis allows air leaks, which may interrupt and

redirect the flow of cooling air from internal components.

Preparing to Install the Cisco 2524 and Cisco 2525 Routers 2-5

General Site Requirements

Configuring Equipment Racks

The following tips will help you plan an acceptable equipment rack configuration:

•Enclosed racks must have adequate ventilation. Ensure that the rack is not overly

congested because each unit generates heat. An enclosed rack should have louvered

sides and a fan to provide cooling air.

•When mounting a chassis in an open rack, ensure that the rack frame does not block the

intake or exhaust ports. If the chassis is installed on slides, check the position of the

chassis when it is seated all the way into the rack.

•In an enclosed rack with a ventilation fan in the top, excessive heat generated by

equipment near the bottom of the rack can be drawn upward and into the intake ports of

the equipment above it in the rack. Ensure that you provide adequate ventilation for

equipment at the bottom of the rack.

•Baffles can help to isolate exhaust air from intake air, which also helps to draw cooling

air through the chassis. The best placement of the baffles depends on the airflow patterns

in the rack, which are found by experimenting with different arrangements.

Power Supply Considerations

Check the power at your site to ensure that you are receiving “clean” power (free of spikes

and noise). Install a power conditioner if necessary.

Warning The device is designed to work with TN power systems. (To see translated

versions of this warning, refer to the appendix “Translated Safety Warnings.”)

2-6 Cisco 2524 and Cisco 2525 Router User Guide

Installation Checklist

The router’s AC power supply includes the following features:

•Autoselects either 110V or 220V operation.

•All units include a 6-foot (1.8-meter) electrical power cord. (A label near the power cord

indicates the correct voltage, frequency, current draw, and power dissipation for the

unit.)

Warning This product relies on the building’s installation for short-circuit (overcurrent)

protection. Ensure that a fuse or circuit breaker no larger than 120 VAC, 15A U.S.

(240 VAC, 10A international) is used on the phase conductors (all current-carrying

conductors). (To see translated versions of this warning, refer to the appendix “Translated

Safety Warnings.”)

The Cisco 2524 offers a direct current (DC) power supply. See the section “DC Power

Specifications” in the chapter “Installing the Cisco 2524 and Cisco 2525 Routers” for more

information.

Installation Checklist

The Installation Checklist lists the procedures for initial hardware installation of a new

router. Make a copy of this checklist and mark the entries as you complete each procedure.

Include a copy of the checklist for each system in your Site Log. (See the next section,

“Creating a Site Log.”)

Preparing to Install the Cisco 2524 and Cisco 2525 Routers 2-7

Installation Checklist

Installation checklist for site______________________________________________

Router name__________________________________________________________

Task Verified by Date

Installation checklist copied

Background information placed in Site Log

Site power voltages verified

Required tools available

Additional equipment available

Router received

Optional UniverCD or printed documentation

received

Chassis components verified

Initial electrical connections established

ASCII terminal or PC attached to console port

Signal distance limits verified

Startup sequence steps completed

Initial system operation verified

Software image verified

2-8 Cisco 2524 and Cisco 2525 Router User Guide

Creating a Site Log

The Site Log provides a record of all actions relevant to the router. Keep it near the chassis

where anyone who installs or maintains the router has access to it. Use the Installation

Checklist (see the previous section, “Installation Checklist”) to verify steps in the

installation and maintenance of your router. Site Log entries might include the following:

•Installation progress—Make a copy of the Installation Checklist and insert it into the

Site Log. Make entries on the checklist as you complete each procedure.

•Upgrade and maintenance procedures—Use the Site Log as a record of ongoing system

maintenance and expansion. Each time a procedure is performed on the router, update

the Site Log to reflect the following:

—Configuration changes

—Changes and updates to Cisco IOS software

—Maintenance schedules and requirements

—Corrective maintenance procedures performed

—Intermittent problems

—Related comments and notes

Preparing to Connect to a Network

When setting up your router, consider distance limitations and potential electromagnetic

interference (EMI) as defined by the EIA.

Warning The Ethernet 10BaseT, Token Ring, serial, console, and auxiliary ports contain

safety extra-low voltage (SELV) circuits. BRI circuits are treated like telephone-network

voltage (TNV) circuits. Avoid connecting SELV circuits to TNV circuits. (To see translated

versions of this warning, refer to the appendix “Translated Safety Warnings.”)

Preparing to Install the Cisco 2524 and Cisco 2525 Routers 2-9

Preparing to Connect to a Network

2-Wire Switched 56-kbps DSU/CSU WAN Module

The 2-wire switched 56-kbps DSU/CSU WAN module includes an RJ-11 port for

connection to a WAN. Cables are not included with the modules; however, port pinouts are

listed in the section “Fractional T1/T1 DSU/CSU Module Port Pinouts” in the appendix

“Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers.”

Warning Network hazardous voltages are present in the BRI, fractional T1/T1, and

switched 56 cables. If you detach the cable, detach the end away from the router first to

avoid possible electric shock. Network hazardous voltages are also present in the area of

the BRI (RJ-45), fractional T1/T1 (RJ-48C), and switched 56 (RJ-11 or RJ-48S) ports,

regardless of whether power is OFF or ON. (To see translated versions of this warning, refer

to the appendix “Translated Safety Warnings.”)

Warning This card is intended to be installed in UL- and CSA-certified equipment in the

field by the user in the manufacturer’s defined operator access area. Check the equipment

manufacturer to verify/confirm that your equipment is suitable for user-installed

application cards. (To see translated versions of this warning, refer to the appendix

“Translated Safety Warnings.”)

Table 2-2 lists network specifications to consider before connecting the module to a

network.

Table 2-1 2-Wire Switched 56-kbps DSU/CSU WAN Module Network

Specifications

Description Specification

Loop rates 56 kbps

Data rates 56 kbps

Line requirements Northern Telecom Datapath

Technology, Bellcore TR-EOP-000277

Receiver sensitivity –42 dB at 80 kHz1

1. kHz = kilohertz.

2-10 Cisco 2524 and Cisco 2525 Router User Guide

Preparing to Connect to a Network

4-Wire 56/64-kbps DSU/CSU WAN Module

The 4-wire 56/64-kbps DSU/CSU WAN module includes an RJ-48S port for connection to

a WAN. Cables are not included with the module; however, port pinouts are listed in the

section “4-Wire 56/64-kbps DSU/CSU Module Port Pinouts” in the appendix “Cabling

Specifications for the Cisco 2524 and Cisco 2525 Routers.

Warning Network hazardous voltages are present in the BRI, fractional T1/T1, and

switched 56 cables. If you detach the cable, detach the end away from the router first to

avoid possible electric shock. Network hazardous voltages are also present in the area of

the BRI (RJ-45), fractional T1/T1 (RJ-48C), and switched 56 (RJ-11 or RJ-48S) ports,

regardless of whether power is OFF or ON. (To see translated versions of this warning, refer

to the appendix “Translated Safety Warnings.”)

Warning This card is intended to be installed in UL- and CSA-certified equipment in the

field by the user in the manufacturer’s defined operator access area. Check the equipment

manufacturer to verify/confirm that your equipment is suitable for user-installed

application cards. (To see translated versions of this warning, refer to the appendix

“Translated Safety Warnings.”)

Table 2-2 lists network specifications to consider before connecting the module to a

network.

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