Cisco CPA2501, CPA2514, CPA2515, CPA2502, CPA2503 User Manual
...
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
This publication is designed for the person installing the router, who should be familiar with
electronic circuitry and wiring practices and have experience as an electronic or
electromechanical technician.
About This Guide xv
Organization
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 ho w 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 Meansr eader take note. Notes contain helpful suggestions or 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
1
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
2
BRI
3
Model
Cisco 2501/
Ethernet
1
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.
4
–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
1
/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.
2
• Ethernet AUI (IEEE
802.3) (DB-15)
• Token Ring (IEEE 802.5) (DB-9)
3
• Synchronous serial
• ISDN BRI (RJ-45)
(DB-60)
4
• 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
2
• 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 theRe gulatory 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
1
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
1
2
Typical
Devices
Terminal
PC
Router
Modem
CSU/DSU
Multiplexer
3
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
H1344a
Preparing to Install the Router 2-13
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
H1616a
Figure 2-5 X.21 Serial Transition Cable Connectors, Network End
8
15
1
9
2-14 Router Installation and Configuration Guide
DTE
DCE
H1346a
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
H1615a
Preparing to Install the Router 2-15
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.
2-16 Router Installation and Configuration Guide
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