Cisco CISCO2515-RF - 2515 Router, 2501, 2509 - Router - EN, CPA2501, 2502 User Manual

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About This Guide

This section discusses the objectives, audience, organization, and conventions of this hardware installation and conﬁguration guide.

Objectives

This publication will step you through the initial site preparation and installation of the router. Troubleshooting, maintenance procedures, and cable speciﬁcations are also provided.

Although minimum software conﬁguration information is provided, it is not meant as comprehensive router conﬁguration instructions. For detailed software conﬁguration information, refer to the Cisco IOS conﬁguration guide and command reference publications. These publications are available on the documentation CD that came with your router or you can order printed copies. Refer to the “Ordering Documentation” section in the “Overview of the Router” chapter for ordering information.

This publication describes a variety of router models that are similar in functionality, but differ in the number of interfaces supported. Some information provided may not apply to your particular router model.

Audience

Thispublicationisdesignedforthepersoninstallingtherouter, who shouldbefamiliar with electronic circuitry and wiring practices and have experience as an electronic or electromechanical technician.

About This Guide xv

Organization

The major sections of this hardware installation and conﬁguration guide are as follows:

• Chapter 1, “Overview of the Router,” discusses the features and speciﬁcations of the

routers, and describes how to obtain technical support and order documentation.

• Chapter 2, “Preparing to Install the Router,” discusses environmental requirements,

safety recommendations, and describes the various ports and how to prepare for connections between networks and ports.

• Chapter 3, “Installing the Router,” includes basic installation information and discusses

making connections to your LAN, WAN, and console terminal.

• Chapter 4, “Conﬁguring the Router,” discusses how to conﬁgure your router using the

prompt-driven System Conﬁguration Dialog, conﬁguration mode, or AutoInstall. This chapter also provides some basic information about how to use the Cisco IOS software.

• Appendix A, “Troubleshooting the Router,”discusses how to isolate problems and read

the LEDs.

• Appendix B, “Maintaining the Router,” discusses selected maintenance procedures.

• Appendix C, “Cable Speciﬁcations,” provides pinouts for the router ports and cables.

Conventions

This publication uses the following conventions to convey instructions and information. Command descriptions use these conventions:

• Commands and keywords are in boldface font.

• Variables for which you supply values are in italic font.

• Elements in square brackets ([ ]) are optional.

• Alternative but required keywords are grouped in braces ({ }) and are separated by

vertical bars ( | ).

xvi Router Installation and Configuration Guide

Conventions

Examples use these conventions:

• Terminal sessions and information the system displays are in screen font.

• Information you enter is in boldface screen font.

• Nonprinting characters are in angle brackets (< >).

• Default responses to system prompts are in square brackets ([ ]).

Note Meansreadertake note. Notes contain helpfulsuggestionsor references to materials

not contained in this manual.

Timesaver Means the described action saves time. You can save time by performing the

action described in the paragraph.

Caution Means reader be careful. In this situation, you might do something that could

result in equipment damage or loss of data.

Warning This warning symbol means danger. You are in a situation that could cause

bodily injury. Before you work on any equipment, you must be aware of the hazards involved with electrical circuitry and familiar with standard practices for preventing accidents. (To see translated versions of this warning, refer to the Regulatory Compliance and Safety Information document that accompanied your router.)

About This Guide xvii

Conventions

xviii Router Installation and Configuration Guide

CHAPTER

Overview of the Router

Table 1-1 lists the router models discussed in this publication and provides a summary of the interfaces supported on each model. These router models are similar in functionality, but differ in the number of interfaces supported.

Table 1-1 Summary of Router Interfaces

BRI

Model

Cisco 2501/

Ethernet

AUI

(DB-15)

1–2–

Token Ring (DB-9)

CPA2501 Cisco 2502/

–12–

CPA2502 Cisco 2503/

1–21

CPA2503 Cisco 2504/

–121

CPA2504 Cisco 2513/

112–

CPA2513 Cisco 2514/

2–2–

CPA2514 Cisco 2515

1. AUI = attachment unit interface.

2. ISDN = Integrated Services Digital Network.

3. BRI = Basic Rate Interface.

4. A CPA2515 model is not available.

–22–

Serial (DB-60)

ISDN (RJ-45)

Overview of the Router 1-1

Hardware Features

Note Throughout the remainder of the publication, one model number will be used in text

references. For example, references to the model 2501 router will apply to both the Cisco 2501 and CPA2501 routers.

Hardware Features

In addition to the interfaces listed in Table 1-1, the routers include the following hardware features:

• Dynamic random-access memory (DRAM) for main memory and shared memory

• Nonvolatile random-access memory (NVRAM) for storing conﬁguration information

• Flash memory for running the Cisco IOS software

• EIA/TIA-232 console port for local system access using a console terminal

• EIA/TIA-232 auxiliary port for remote system access using a modem

Note EIA/TIA-232 and EIA/TIA-449 were known as recommended standards RS-232

and RS-449 before their acceptance as standards by the Electronic Industries Association (EIA) and Telecommunications Industry Association (TIA).

Figure 1-1 to Figure 1-7 show the rear panels of the router models discussed in this publication.

1-2 Router Installation and Configuration Guide

Figure 1-1 Model 2501 Router Rear Panel

Hardware Features

Ethernet AUI LED

Ethernet AUI port

(DB-15)

Synchronous

serial LEDs

Synchronous

serial ports

(DB-60)

System

OK LED

Console

port (RJ-45)

Auxiliary port

(RJ-45)

Figure 1-2 Model 2502 Router Rear Panel

Token Ring

LED

Synchronous

serial LEDs

System

OK LED

On/off switch

H4262

Power

H6585

Token Ring

port (DB-9)

serial ports

(DB-60)

Console

port (RJ-45)

Auxiliary port

(RJ-45)

On/off switch

PowerSynchronous

Overview of the Router 1-3

Hardware Features

Figure 1-3 Model 2503 Router Rear Panel

System

OK LED

port

Auxiliary port

(RJ-45)

Ethernet AUI port

(DB-15)

Ethernet AUI LED

Synchronous

serial LEDs

serial ports

(DB-60)

ISDN

BRI LED

Console

(RJ-45)

ISDN

BRI port

(RJ-45)

Figure 1-4 Model 2504 Router Rear Panel

Token Ring

LED

Synchronous

serial LEDs

ISDN

BRI LED

System

OK LED

On/off

switch

H6586

PowerSynchronous

H6587

Token Ring

port (DB-9)

Synchronous

1-4 Router Installation and Configuration Guide

serial ports

(DB-60)

Console

ISDN

BRI port

(RJ-45)

port

(RJ-45)

On/off switch

Auxiliary port

(RJ-45)

Power

Figure 1-5 Model 2513 Router Rear Panel

Hardware Features

Token Ring

LED

TOKEN RING

Token Ring

port (DB-9)

Ethernet

AUI LEDs

Ethernet AUI LED

Ethernet AUI port

(DB-15)

Synchronous

serial LEDs

Synchronous

serial ports

(DB-60)

Console port

(RJ-45)

System

OK LED

Auxiliary port

(RJ-45)

Figure 1-6 Model 2514 Router Rear Panel

Synchronous

serial LEDs

System

OK LED

On/off

switch

H6588

Power

H6589

Ethernet

AUI ports

(DB-15)

Synchronous

serial ports

(DB-60)

Console

port (RJ-45)

Auxiliary port

(RJ-45)

On/off switch

Power

Overview of the Router 1-5

System Specifications

Figure 1-7 Model 2515 Router Rear Panel

Token Ring

LEDs

Token Ring

ports (DB-9)

Synchronous

serial LEDs

Synchronous

serial ports

(DB-60)

System Speciﬁcations

The system speciﬁcations of the routers are listed in Table 1-2.

Table 1-2 System Speciﬁcations Description Speciﬁcation

Dimensions (H x W x D) 1.75 x 17.5 x 10.56 in. (4.44 x 44.45 x 26.82 cm),

Weight 10 lb (4.5 kg) Input voltage, AC power supply

Current Frequency Power dissipation

Input voltage, DC power supply Current Power dissipation

Processor 20-MHz Motorola 68EC030

System

OK LED

Console

port (RJ-45)

Auxiliary port

(RJ-45)

On/off switch

one rack unit

100 to 240 VAC

1.2 to 0.6A 50/60 Hz 40W (maximum), 135.5 Btus

40W, 40 to 72 VDC

1.5 to 1.0A 40W (maximum), 135.5 Btus/hr

Power

H6590

/hr

1-6 Router Installation and Configuration Guide

Obtaining Service and Support

Table 1-2 System Speciﬁcations (Continued) Description Speciﬁcation

Interfaces See Table 1-1 for a list of interfaces supported on each

router model.

• Ethernet AUI (IEEE

802.3) (DB-15)

• Token Ring (IEEE 802.5) (DB-9)

• Synchronous serial

• ISDN BRI (RJ-45)

(DB-60)

• Console (RJ-45)

• Auxiliary (RJ-45)

Operating environment 32 to 104°F (0 to 40°C) Nonoperating temperature –40 to 185°F (–40 to 85°C) Operating humidity 5 to 95%, noncondensing Noise level 34 dBa @ 3 ft (0.914 m) Regulatory compliance FCC Class A and Canadian DOC Class A

For more regulatory information, refer to the

Regulatory Compliance and Safety Information

document that accompanied your router.

1. Btus = British thermal units.

2. IEEE = Institute of Electrical and Electronic Engineers.

3. The synchronous serial interface supports the following standards in data terminal equipment (DTE) and data communications equipment (DCE) mode: EIA/TIA-232, EIA/TIA-449, V.35, and X.21. The EIA-530 standard is supported in DTE mode only.

4. External network terminal 1 (NT1) device required.

Obtaining Service and Support

For service and support for a product purchased from a reseller, contact the reseller. Resellers offer a wide variety of Cisco service and support programs, which are described in the information packet that shipped with your chassis.

Overview of the Router 1-7

Cisco Connection Online

Note If you purchased your product from a reseller, you can access Cisco Connection

Online (CCO) as a guest. CCO is Cisco Systems’ primary , real-time support channel.Your reseller offers programs that include direct access to CCO’s services.

For service and support for a product purchased directly from Cisco, use CCO.

Cisco Connection Online

CCO is Cisco Systems’ primary, real-time support channel. SMARTnet customers and partners can self-register on CCO to obtain additional content and services.

Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco’s customers and business partners. CCO services include product information, software updates, release notes, technical tips, the Bug Navigator, conﬁguration notes, brochures, descriptions of service offerings, and download access to public and authorized ﬁles.

CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously—a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, ﬁgures, graphics, and video, as well as hyperlinks to related information.

You can access CCO in the following ways:

• WWW: http://www.cisco.com.

• WWW: http://www-europe.cisco.com.

• WWW: http://www-china.cisco.com.

• Telnet: cco.cisco.com.

• Modem: From North America, 408 526-8070; from Europe, 33 1 64 46 40 82. Use the

following terminal settings: VT100 emulation; databits: 8; parity: none; stop bits: 1; and baud rates up to 14.4 kbps.

1-8 Router Installation and Configuration Guide

For a copy of CCO’ s Frequently Asked Questions (F A Q), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.

Note If you need technical assistance with a Cisco product that is under warranty or

covered by a Cisco maintenance contract, contact Cisco’s Technical Assistance Center (TAC) at 800 553-2447, 408 526-7209, or tac@cisco.com.

Please use CCO to obtain general information about Cisco Systems, Cisco products, or upgrades. If CCO is not accessible, contact 800 553-6387, 408 526-7208, or cs-rep@cisco.com.

Ordering Documentation

Documentation for Cisco products is available in three forms: on a CD-ROM, printed books, and on the World Wide Web. You have the option of subscribing to the documentation CD through an update service. Or you can order printed documentation at an additional cost. Refer to the information packet included with the router for detailed ordering information. You can also access Cisco documentation on the World Wide Web URL http://www.cisco.com.

Ordering Documentation

Overview of the Router 1-9

Ordering Documentation

1-10 Router Installation and Configuration Guide

Preparing to Install the Router

This chapter describes important information to consider before you begin to install the router, and includes the following sections:

• Safety Recommendations

• General Site Requirements

• Preparing to Connect to a Network

• Where to Go Next

Safety Recommendations

Follow these guidelines to ensure general safety:

CHAPTER

• 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.

• W ear safety glasses if you are working under an y 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.

Preparing to Install the Router 2-1

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 Regulatory Compliance and Safety Information document that accompanied your router.)

Maintaining Safety with Electricity

Follow these guidelines when working on equipment powered by electricity.

Warning Before working on equipment that is connected to po wer lines, remo ve 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. (T o see translated v ersions of this w arning, refer to theRegulatory Compliance and Safety Information document that accompanied your router.)

• Locate the emergency power OFF switch for the room in which you are w orking. Then,

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

• Power OFF the router and unplug the power cord before doing the following:

— Installing or removing a chassis — Working near power supplies

Warning Before working on a chassis or working near po wer supplies, unplug the power

cord on AC units; disconnect the power at the circuit break er on DC units. (T o see translated versions of this warning, refer to the Regulatory Compliance and Safety Information document that accompanied your router.)

Warning Do not touch the power supply when the power cord is connected. For systems

with a power switch, line voltages are present within the po wer supply even when the po wer switch is OFF and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected. (To see translated versions of this warning, refer to the Regulatory Compliance and Safety Information document that accompanied your router.)

2-2 Router Installation and Configuration Guide

Safety Recommendations

• Do not work alone if potentially hazardous conditions exist.

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

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

source. (T o see translated versions of this warning, refer to theRegulatory Compliance and Safety Information document that accompanied your router.)

• 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. It 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 clip to an unpainted surface of the chassis frame to safely channel unwanted ESD voltages to ground. 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.

Preparing to Install the Router 2-3

General Site Requirements

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

should be between 1 to 10 megohms (Mohms).

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 router can be placed on a desktop or mounted in a rack or on a wall. The location of the chassis 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 system maintenance difﬁcult.

When planning your site layout and equipment locations, remember 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 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 en vironment 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 “Preventing

Electrostatic Discharge Damage” earlier in this chapter to avoid damage to equipment. Damage from static discharge can cause immediate or intermittent equipment failure.

2-4 Router Installation and Configuration Guide

• 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.

Conﬁguring Equipment Racks

The following information 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 the 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.

General Site Requirements

Power Supply Considerations

Check the power at your site to ensure that you are receiving “clean” po wer (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 Regulatory Compliance and Safety Information document that accompanied your router.)

Preparing to Install the Router 2-5

Preparing to Connect to a Network

The router 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). (T o see translated versions of this warning, refer to theRegulatory Compliance and Safety Information document that accompanied your router.)

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, Token Ring, serial, console, and auxiliary ports contain safety

extra-low voltage (SELV) circuits. BRI circuits are treated lik e telephone-network v oltage (TNV) circuits. Avoid connecting SELV circuits to TNV circuits. (To see translated versions of this warning, refer to the Regulatory Compliance and Safety Information document that accompanied your router.)

2-6 Router Installation and Configuration Guide

ISDN Connections

Use a BRI cable (not included) to connect the router directly to an ISDN. (See Table 2-1.)

Warning Network hazardous voltages are present in the BRI cable. If you detach the BRI

cable, detach the end away from the router ﬁrst to avoid possible electric shock. Network hazardous voltages also are present on the system card in the area of the BRI port (RJ-45 connector), regardless of when power is turned OFF. (To see translated versions of this warning, refer to the Regulatory Compliance and Safety Information document that accompanied your router.)

Warning The ISDN connection is regarded as a source of voltage that should be

inaccessible to user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or connection hardware. Any hardwired connection (other than by a nonremovable, connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers. (To see translated versions of this warning, refer to the Regulatory Compliance and Safety Information document that accompanied your router.)

Preparing to Connect to a Network

T able 2-1 lists the speciﬁcations for ISDN BRI cables. Refer to the section “ISDN BRI Port and Cable Pinouts” in the appendix “Cable Speciﬁcations” for pinouts.

Table 2-1 ISDN BRI Cable Speciﬁcations Speciﬁcation High-Capacitance Cable Low-Capacitance Cable

Resistance (at 96 kHz) 160 ohms/km 160 ohms/km

Capacitance (at 1 kHz) 120 nF Impedance (96 kHz) 75 ohms 150 ohms Wire diameter 0.024 in. (0.6 mm) 0.024 in. (0.6 mm) Distance limitation 32.8 ft (10 m) 32.8 ft (10 m)

1. nF = nanoFarad.

/km 30 nF/km

Preparing to Install the Router 2-7

Preparing to Connect to a Network

Synchronous Serial Connections

Before you connect a device to the synchronous serial port (labeled “SERIAL”), you will need to know the following:

• The type of device, DTE or DCE, you are connecting to the synchronous serial

interface.

• The type of connector, male or female, required to connect to the device.

• The signaling standard required by the device.

DTE or DCE

A device that communicates over a synchronous serial interface is either a DTE or DCE device. A DCE device provides a clock signal that paces the communications between the device and the router . A DTE device does not provide a clock signal. DTE devices usually connect to DCE devices. The documentation that came with the device should indicate whether it is a DTE or DCE device. (Some devices ha ve a jumper to select either mode.) If you cannot ﬁnd the information in the documentation, refer to T able 2-2 to help you select the proper device type.

Table 2-2 Typical DTE and DCE Devices

Device Type Gender

DTE Male

DCE Female

1. If pins protrude from the base of the connector, the connector is male.

2. If the connector has holes to accept pins, the connector is female.

3. CSU/DSU = Channel service unit/data service unit.

2-8 Router Installation and Configuration Guide

Typical Devices

Terminal PC Router

Modem CSU/DSU Multiplexer

Speed and Distance Limitations

Serial signals can travel a limited distance at any given bit rate; generally, the slower the data rate, the greater the distance. All serial signals are subject to distance limits, beyond which a signal degrades signiﬁcantly or is completely lost.

T able 2-3 lists the maximum speeds and distances for EIA/TIA-232 signals. This signaling standard supports unbalanced circuits at signal speeds up to 64 kbps.

Table 2-3 EIA/TIA-232 Speed and Distance Limitations

Preparing to Connect to a Network

Data Rate (Baud)

2400 200 60 4800 100 30 9600 50 15 19200 50 15 38400 50 15 64000 25 7.6

Distance (Feet)

Distance (Meters)

Balanced drivers allow EIA/TIA-449 signals to travel greater distances than the EIA/TIA-232 signals. Table 2-4 lists the maximum speeds and distances for EIA/TIA-449, V.35, X.21, and EIA-530 signals.

Table 2-4 EIA/TIA-449, V.35, X.21, and EIA-530 Speed and Distance

Limitations

Data Rate (Baud)

2400 4,100 1,250 4800 2,050 625 9600 1,025 312 19200 513 156

Distance (Feet)

Distance (Meters)

Preparing to Install the Router 2-9

Preparing to Connect to a Network

Table 2-4 EIA/TIA-449, V.35, X.21, and EIA-530 Speed and Distance

Limitations (Continued)

Data Rate (Baud)

38400 256 78 56000 102 31

Caution The EIA/TIA-449 and V.35 interfaces support data rates up to 2.048 Mbps.

Exceeding this maximum could result in loss of data and is not recommended.

Signaling Standards

The synchronous serial port supports the following signaling standards: EIA/TIA-232, EIA/TIA-449, V.35, X.21, and EIA-530. You can order a DB-60 shielded serial transition cable that has the appropriate connector for the standard you specify. The router end of the shielded serial transition cable has a DB-60 connector, which connects to the serial port on the rear panel of the router. The other end of the serial transition cable is a v ailable with the connector appropriate for the standard you specify. The documentation for the device you want to connect should indicate the standard used for that device. The synchronous serial port can be conﬁgured as DTE or DCE (except EIA-530, which is DTE only), depending on the attached cable.

Note All serial ports conﬁgured as DTE require external clocking from a CSU/DSU or

other DCE device.

Distance (Feet)

Distance (Meters)

Figure 2-1 shows the serial transition cables you can connect to the serial port on the rear panel of the router.

2-10 Router Installation and Configuration Guide

Figure 2-1 Serial Transition Cables

Router connections

Preparing to Connect to a Network

EIA/TIA-232 EIA-530

EIA/TIA-449 V.35 X.21

Network connections at the modem or CSU/DSU

Although attempting to manufacture your own serial cables is not recommended (because of the small size of the pins on the DB-60 serial connector), cable pinouts are provided in the appendix “Cable Speciﬁcations.” To order a cable, refer to the section “Obtaining Service and Support” in the “Overview of the Router” chapter.

Preparing to Install the Router 2-11

H2485

Preparing to Connect to a Network

EIA/TIA-232 Connections

The EIA/TIA-232 standard supports unbalanced circuits at signal speeds up to 64 kbps. The serial port (labeled “SERIAL”) supports synchronous connections. The console and auxiliary ports also use an EIA/TIA-232 connection; however, the console and auxiliary ports support asynchronous connections.

The network end of the EIA/TIA-232 serial transition cable (not included) provides a DB-25 connector, as shown in Figure 2-2. The end that connects to the serial port on the rear panel of the router has a DB-60 connector. EIA/TIA-232 serial transition cables are available with a DB-25 plug or receptacle in either DTE or DCE mode. To order a cable, refer to the section “Obtaining Service and Support” in the “Overview of the Router” chapter.

Figure 2-2 EIA/TIA-232 Serial Transition Cable Connectors, Network End

DTE

EIA/TIA-449 Connections

The EIA/TIA-449 standard, which supports balanced and unbalanced transmissions, is a faster (up to 2 Mbps) version of the EIA/TIA-232 standard that provides more functions and supports transmissions over greater distances.

The EIA/TIA-449 standard was intended to replace the EIA/TIA-232 standard, but it was not widely adopted primarily because of the large installed base of DB-25 hardware and because of the larger size of the 37-pin EIA/TIA-449 connectors, which limited the number of connections possible (fewer than possible with the smaller, 25-pin EIA/TIA-232 connector).

2-12 Router Installation and Configuration Guide

DCE

H1343a

Preparing to Connect to a Network

The network end of the EIA/TIA-449 serial transition cable (not included) provides a DB-37 connector, as shown in Figure 2-3. The end that connects to the serial port on the rear panel of the router has a DB-60 connector. EIA/TIA-449 serial transition cables are available with a DB-37 plug or receptacle in either DTE or DCE mode. To order a cable, refer to the section “Obtaining Service and Support” in the “Overview of the Router” chapter.

Figure 2-3 EIA/TIA-449 Serial Transition Cable Connectors, Network End

DTE

V.35 Connections

The V.35 standard is recommended for speeds up to 48 kbps, although in practice it is used successfully at 4 Mbps.

The network end of the V.35 serial transition cable (not included) provides a standard 34-pin Winchester-type connector, as shown in Figure 2-4. The end that connects to the serial port on the rear panel of the router has a DB-60 connector. V.35 cables are available with a standard V.35 plug or receptacle in either DTE or DCE mode. To order a cable, refer to the section “Obtaining Service and Support” in the “Overview of the Router” chapter.

DCE

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Preparing to Connect to a Network

Figure 2-4 V.35 Serial Transition Cable Connectors, Network End

X.21 Connections

The X.21 connector uses a 15-pin connector for balanced circuits and is commonly used in the United Kingdom to connect to the public data network. X.21 relocates some of the logic functions to the DTE and DCE interfaces and, as a result, requires fewer circuits and a smaller connector than EIA/TIA-232.

The network end of the X.21 serial transition cable (not included) is a standard DB-15 connector, as shown in Figure 2-5. The end that connects to the serial port on the rear panel of the router has a DB-60 connector. X.21 cables are a vailable with a plug or receptacle in either DTE or DCE mode. To order a cable, refer to the section “Obtaining Service and Support” in the “Overview of the Router” chapter.

DTE

DCE

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Figure 2-5 X.21 Serial Transition Cable Connectors, Network End

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DTE

DCE

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EIA-530 Connections

The EIA-530 standard, which supports balanced transmission, provides the increased functionality, speed, and distance of EIA/TIA-449 on the smaller, DB-25 connector used for EIA/TIA-232, instead of the 37-pin connector used for EIA/TIA-449. Like EIA-TIA-449, EIA-530 refers to the electrical speciﬁcations of EIA/TIA-422 and EIA/TIA-423. Although the speciﬁcation recommends a maximum speed of 2 Mbps, EIA-530 is used successfully at 4 Mbps or faster speeds over short distances.

The EIA/530 serial transition cable (not included) is available in DTE mode only. The network end of the EIA-530 adapter cable is a standard DB-25 plug commonly used for EIA/TIA-232 connections, as shown in Figure 2-6. The end that connects to the serial port on the rear panel of the router has a DB-60 connector. To order a cable, refer to the section “Obtaining Service and Support” in the “Overview of the Router” chapter.

Figure 2-6 EIA-530 Serial Transition Cable Connector, Network End

Preparing to Connect to a Network

Ethernet Connections

The IEEE has established Ethernet as standard 802.3. The most common Ethernet implementations are as follows:

• 10Base5 (AUI)—Ethernet on thick coaxial cable, also known as thick Ethernet. The

maximum segment distance is 1,640 feet (500 meters).

• 10Base2 (Thinnet)—Ethernet on thin coaxial cable, also known as thin Ethernet. The

maximum segment distance is 607 feet (185 meters).

• 10BaseT—Ethernet on unshielded twisted-pair (UTP) cable. The maximum segment

distance is 328 feet (100 meters). UTP cables look like the cables used for ordinary telephones; however , UTP cables meet certain electrical standards that telephone cables do not.

DTE

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Preparing to Connect to a Network

Ethernet model routers include an Ethernet AUI interface, which operates at speeds up to 10 Mbps.

The cables and transceivers required to connect the router to an Ethernet network are not included. For ordering information, refer to the section “Obtaining Service and Support” in the “Overview of the Router” chapter.

Token Ring Connections

The IEEE has established Token Ring as standard 802.5. The distance limitations for the IEEE 802.5 speciﬁcation indicate a maximum segment distance of 328 feet (100 meters) for UTP cabling. The distance limitation is 1,640 feet (500 meters) for shielded twisted-pair (STP) cabling.

T oken Ring can operate at two dif ferent ring speeds: 4 and 16 Mbps. All devices on the ring must agree on the operating speed.

Use a T ok en Ring lobe cable to connect the router to a media attachment unit (MAU). The lobe cable and MAU are not included with the router . Refer to the section “Token Ring Port Pinouts” in the appendix “Cable Speciﬁcations” for the Token Ring port pinouts.

Console and Auxiliary Port Connections

Y our router includes an asynchronous serial console and an auxiliary port. The console and auxiliary ports provide access to the router either locally (with a console terminal) or remotely (with a modem). This section discusses important cabling information to consider before connecting a console terminal (an ASCII terminal or PC running terminal emulation software) to the console port or modem to the auxiliary port.

The main difference between the console and auxiliary ports is that the auxiliary port supports hardware ﬂow control and the console port does not. Flow control paces the transmission of data between a sending device and a receiving de vice. Flow control ensures that the receiving device can absorb the data sent to it before the sending de vice sends more. When the buffers on the receiving device are full, a message is sent to the sending device to suspend transmission until the data in the buffers has been processed. Because the auxiliary port supports ﬂow control, it is ideal for use with the high-speed transmissions of a modem. Console terminals transmit at slower speeds than modems; therefore, the console port is ideal for use with console terminals.

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