Cisco WS-C2950-24 Hardware Installation Manual

Catalyst 2950 Desktop Switch
Hardware Installation Guide

December 20 01

Corporate Headquarters

Cisco Systems , Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
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800 553-NETS (6387)

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Customer Order Number: DOC-7811157=
Text Part Number: 78-11157-02

THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT
NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT
ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR
THEIR APPLICATION OF ANY PRODUCTS.

THE SOFTW ARE LICENSE AND LIMITED WARRANTY FO R THE A CCOMPANYING PR ODUCT ARE S ET FORTH IN THE INFORMATION
PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO
LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.

The following information is for FCC compliance of Class A devices: This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case users will be required to cor rect t he interference at their own expense.

The following information is for FCC complia nce of Class B devices: The equi pment des cribed in this manual generates and may rad iate
radio-frequency energy. If it is not installed in accordance with Cisco’s installation instructions, it may cause interference with radio and television
reception. This equipment has been tested and found to comply with the limits for a Class B digital device in accordance with the specifications in
part 15 of the FCC rules. These specifications are designed to provide reasonable protection against such interference in a residential installation.
However, there is no guarantee that interference will not occur in a particular installation.

Modifying the equipment wit hou t Cisco’s written autho riz atio n may resul t in the equi pme nt no longe r comply ing with FCC re quir ements for Class
A or Class B digital devices. In that event, your right to use the equipm ent may be lim ited by FCC regulations, and you may be required to correct
any interference to radio or television communicati ons at your own expense.

You can determine whether your equipment is causing int erferen ce by turning it off. If the inter ference stops, it was probably caused by the Cisco
equipment or one of its peripheral devices. If the equipment causes interference to radio or television reception, try to correct the interference by
using one or more of the following measures:

• Turn the television or radio antenna until the interferenc e stops.

• Move the equipment to one side or the other of the television or radio .

• Move the equipment farther away from the television or radio.

• Plug the equipment into an outlet that is on a different circ uit from the tel evision or radio. (That is, make certain the equip ment and the television
or radio are on circuits controlled by different circui t breakers or fuses.)

Modifications to this product not auth orized by Cisco Sys tems, Inc. could void the FCC approval and negate your auth ority to op erate the prod uct.
The Cisco implementation of TCP header compression is an adap tati on o f a pr ogr am d eveloped by the University of California, Berkeley (UCB) as

part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.
NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE

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Academy, the Cisco Systems Networking Academ y logo, Cisco Uni ty, Fast Step, Follo w Me Browsi ng, For mShar e, FrameS hare, IGX, Int ernet
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ScriptShare, SMARTnet, TransPath, Voice LAN, Wavelength Router, and WebViewer are trademarks of Cisco Systems, Inc.; Changing the Way
We Work, Live, Play, and Learn, and Discover All That’s Possible are service marks of Cisco Systems, Inc.; and Aironet, ASIST, BPX, Catalyst,
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All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply
a partnership relationship between Cis co and any oth er company . (0110 R)

Catalyst 2950 Desktop Switch Hardware Installation Guide

Copyright © 2001, Cisco Systems , Inc.
All rights reserved.

Preface xi

Audience xi
Purpose xi
Organization xii
Conventions xii
Related Publications xv
Obtaining Documentation xvi

World Wide Web xvi
Documentation CD-ROM xvi
Ordering Documentation xvii
Documentation Feedback xvii

Obtaining Technical Assistance xviii

Cisco.com xviii
Technical Assistance Center xviii

Cisco TAC Web Site xix
Cisco TAC Escalation Center xx

CONTENTS

CHAPTER

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1 Overview 1-1

Features 1-1
Front-Panel Desc ription 1-3

10/100 Ports 1-6
100BASE-FX Ports 1-7
10/100/1000 Ports 1-8
GBIC Module Ports 1-9

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Contents

LEDs 1-9

System LED 1-12
RPS LED 1-13
Port Mode and Port Status LEDs 1-13

Rear-Panel Description 1-20

Power Connectors 1-22

Internal Power Supply Connector 1-22
DC Power Connector 1-22
Cisco RPS Connector 1-23

Console Port 1-23

Management Options 1-23

CHAPTER

2 Installation 2-1

Preparing for Installation 2-2

Warnings 2-2
EMC Regulatory Statements 2-4

U.S.A. 2-4
Taiwan 2-5
Japan 2-5
Korea 2-6

Hungary 2-6
Installation Guidelines 2-7
Verifying Package Contents 2-8

Installing the Switch in a Rack 2-10

Attaching the Bra ckets to the Switch 2-10
Mounting the Switch in a Rack 2-17
Attaching the Optional Cable Guide 2-18

Installing the Switch on a Table, Shelf, or Desk 2-19
Powering On the Switch 2-19

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Connecting to DC Power 2-20

Preparing for Installation 2-21
Grounding the Switch 2-21
Wiring the DC-Input Po wer Source 2-23

Running POST 2-29
Connecting to 10/100 and 10/100/1000 Ports 2-30
Connecting to 100BASE-FX Ports 2-33
Connecting to GBIC Module Ports 2-34

Connecting to 1000BASE-X GBIC Module Ports 2-34
Connecting to GigaStack GBIC Module Ports 2-36

Connecting a PC or a Ter minal to the Console Port 2-37
Where to Go Next 2-39

Contents

CHAPTER

APPENDIX

APPENDIX

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3 Troubleshooting 3-1

Understanding POST Results 3-2
Diagnosing Problems 3-2

A Technical Specifications A-1

B Connectors and Cables B-1

Connector Specifications B-1

10/100 Ports B-1
100BASE-FX Ports B-2
10/100/1000 Ports B-3

Connecting to 10BASE-T- and 100BASE-TX-Compatible Devices B-3

Connecting to 1000BASE-T-Compatible Devices B-4
1000BASE-X GBIC Module Ports B-5
GigaStack GBIC Module Ports B-5
Console Port B-5

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Contents

Cable and Adapter Spe cifications B-6

Two Twisted-Pair Cable Pinouts B-6
Four Twisted-Pair Cable Pinouts for 10/100 Ports B-7
Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports B-8
Rollover Cable an d Adapter Pinouts B-9

Identifying a Ro llover Cable B-9

Connecting to a PC B-9

Connecting to a Terminal B-10

APPENDIX

C Translated Safety Warnings C-1

Attaching the Cisco RPS (model PWR300-AC-RPS-N1) C-2
Lightning Activity Warning C-3
Power Supply W a rn in g C-4
Installation Warning C-7
Circuit Breaker (15A) Warning C-8
Chassis Warning—Rack-Mounting and Servicing C-10
Overtemperature Warning C-15
TN Power Warn in g C-16
No On/Off Switch Warning C-17
Grounded Equipment Warning C-18
Product Disposal Warning C-19
Ground Connection Wa rning C-20
Jewelry Remo va l W a rn in g C-22
Stacking the Chassis Warning C-24
Qualified Personnel Warning C-25
Supply Circuit W a rn in g C-26

viii

Voltage Warnin g C-27
Class 1 Laser Produ ct Warning C-28

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I

NDEX

Contents

Laser Beam Exposure Warning C-29
48 VDC Power System C-30
Catalyst 2950G-24-EI-DC Use on LANs Only C-31
Catalyst 2950G-24-EI-DC Service Requirement C-33
Single SELV Source Warning C-34
Restricted Area Equipment Installation C-35
Ethernet Cable Shie lding in Offices C-36
DC Power Disco nn e ct io n W a rn in g C-37
Exposed DC Pow e r W ire W ar ni ng C-40
Equipment Connect ion Power Source C-41

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Contents

Catalyst 2950 Desktop Switch Hardware Installation Guide

x

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Audience

Purpose

Preface

This guide is for the networking or computer technician responsible for installing
a Catalyst 2950 switch. We assume that you are familiar with the concepts and
terminology of Ethe rn et an d loc al are a net worki ng.

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The Catalyst 2950 Desktop Switch Hardware Installation Guide describes the
hardware features of Cat aly st 2950 sw itche s. It de scri bes t he p hysi cal a nd
performance char acteristics of the switche s, explains ho w to inst all a switc h, and
provides troubleshootin g infor mat ion.

Catalyst 2950 Desktop Switch Hardware Installation Guide

xi

Organization

Organization

This guide is organized into these chapters:

Chapter 1, “Overview,” describes the switch ports, the standards that they

support, and the L EDs.

Chapter 2, “Installation,” contains the procedures for installing a switch on a rack,

table, shelf, or desk.

Chapter 3, “Troubleshooting,” describes how to identify and solve proble ms that

might arise when you are installing a switch.

Appendix A, “Technical Specifications,” lists the physical and environmental

specifications and the regulatory agency approvals.

Appendix B, “Connecto rs and Ca ble s,” describes the connectors, cables, and

adapters that y ou use to co nne c t a swi tch to an othe r device.

Appendix C, “Translated Safety Warnings,” contains tran slat ion s in various

languages of the warnings in this guide.

Preface

Conventions

This publication use s th e se c onventions to co nvey instructions and in forma ti on.
Notes, cautions, an d wa rnin gs u se the se conventions and s ymb ols.

Note Means reader take note. Notes contain helpful suggestions or references to

materials not contai ned in th is manual .

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

result in equipment damage or l oss of data.

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xii

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Preface

Conventions

Warning

Waarschuwing

Varoitus

Attention

This warning symbol means danger. Y ou are in a situation that could cause
bodily injury. Before you work on any equipment, be aware of the hazards
involved with electrical circuitry and be familiar with standard practices
for preventing accidents. (To see translations of the warnings that appear
in this publication, refer to the Appendix C, “Translated Safety Warnings.”)

Dit waarschuwingssymbool betekent gevaar. U verkeert in een
situatie die lichamelijk letsel kan veroorzaken. Voordat u aan
enige apparatuur gaat werken, dient u zich bewust te zijn van de
bij elektrische schakelingen betrokken risico’s en dient u op de
hoogte te zijn van standaard maatregelen om ongelukken te
voorkomen. (Voor vertalingen van de waarschuwingen die in
deze publicatie verschijnen, kunt u het aanhangsel C “Translated
Safety Warnings” (Vertalingen van veiligheidsvoorschriften)
raadplegen.)

Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi
johtaa ruumiinvammaan. Ennen kuin työskentelet minkään
laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä
vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista.
(Tässä julkaisussa esiintyvien varoitusten käännökset löydät
liitteestä C "Translated Safety Warnings" (käännetyt
turvallisuutta koskevat varoitukset).)

Ce symbole d’avertissement indique un danger . Vous vous trouvez
dans une situation pouvant entraîner des blessures. Avant
d’accéder à cet équipement, soyez conscient des dangers posés
par les circuits électriques et familiarisez-vous avec les
procédures courantes de prévention des accidents. Pour obtenir
les traductions des mises en garde figurant dans cette
publication, veuillez consulter l’annexe intitulée C « Translated
Safety Warnings » (Traduction des avis de sécurité).

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Catalyst 2950 Desktop Switch Hardware Installation Guide

xiii

Conventions

Preface

Warnung

Avvertenza

Advarsel

Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer
Situation, die zu einer Körperverletzung führen könnte. Bevor Sie
mit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich der
mit elektrischen Stromkreisen verbundenen Gefahren und der
Standardpraktiken zur Vermeidung von Unfällen bewußt.
(Übersetzungen der in dieser Veröffentlichung enthaltenen
Warnhinweise finden Sie im Anhang mit dem Titel C “Translated
Safety Warnings” (Übersetzung der Warnhinweise).)

Questo simbolo di avvertenza indica un pericolo. Si è in una
situazione che può causare infortuni. Prima di lavorare su
qualsiasi apparecchiatura, occorre conoscere i pericoli relativi
ai circuiti elettrici ed essere al corrente delle pratiche standard
per la prevenzione di incidenti. La traduzione delle avvertenze
riportate in questa pubblicazione si trova nell’appendice C,
“Translated Safety Warnings” (Traduzione delle avvertenze di
sicurezza).

Dette varselsymbolet betyr fare. Du befinner deg i en situasjon
som kan føre til personskade. Før du utfører arbeid på utstyr, må
du være oppmerksom på de faremomentene som elektriske
kretser innebærer, samt gjøre deg kjent med vanlig praksis når
det gjelder å unngå ulykker. (Hvis du vil se oversettelser av de
advarslene som finnes i denne publikasjonen, kan du se i
vedlegget C "Translated Safety Warnings" [Oversatte
sikkerhetsadvarsler].)

xiv

Aviso

Este símbolo de aviso indica perigo. Encontra-se numa situação
que lhe poderá causar danos fisicos. Antes de começar a
trabalhar com qualquer equipamento, familiarize-se com os
perigos relacionados com circuitos eléctricos, e com quaisquer
práticas comuns que possam prevenir possíveis acidentes. (Para
ver as traduções dos avisos que constam desta publicação,
consulte o apêndice C “Translated Safety Warnings” ­“Traduções dos Avisos de Segurança”).

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Preface

Related P u b lications

¡Advertencia!

Varning!

Este símbolo de aviso significa peligro. Existe riesgo para su
integridad física. Antes de manipular cualquier equipo,
considerar los riesgos que entraña la corriente eléctrica y
familiarizarse con los procedimientos estándar de prevención de
accidentes. (Para ver traducciones de las advertencias que
aparecen en esta publicación, consultar el apéndice titulado C
“Translated Safety Warnings.”)

Denna varningssymbol signalerar fara. Du befinner dig i en situation som
kan leda till personskada. Innan du utför arbete på någon utrustning måste
du vara medveten om farorna med elkretsar och känna till vanligt
förfarande för att förebygga skador. Se förklaringar av de varningar som
förkommer i denna publikation i dokumentet Regulatory Compliance and
Safety Information (Efterrättelse av föreskrifter och säkerhetsinformation),
vilket medföljer denna anordning.

Related Publications

These documents provide co mplete information about the switch and are a vailable
from this Cisco.com site:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/index.htm

78-11157-02

Y ou can order printed copies of documents with a DOC-xxxxxx= number from the
Cisco.com sites and fr om the tel ephone numbe rs listed in t he “O rd er in g

Documentation” section on page xvii.

• Release Notes for the Catalyst 2950 Switch (not orderable but is available on

Cisco.com)

Note Switch requirements and pro cedure s for init ial configurati ons and software

upgrades tend to ch ange and th erefore appear only in th e release n otes. Befo re
installing, configuring, or upgrading the switch, refer to the release notes on
Cisco.com for the latest information.

• Catalyst 2950 Desktop Switch Sof tware Configuration Gui de (order number

DOC-7811380=)

Catalyst 2950 Desktop Switch Hardware Installation Guide

xv

Obtaining Documentation

• Catalyst 2950 Desktop Switch Com mand R eference (order number

DOC-7811381=)

• This Catalyst 2950 Desktop Swi tch Hardware Installation Guide (order

number DOC-7811157=)

• Catalyst GigaStack Gigabit Interface Con verter Har dware Installation Guide

(order number DOC-786460 =)

• Cisco RPS 300 Redundant Power System Hardware Installation Guide (order

number DOC-7810372=)

Obtaining Documentation

The following sections provide sources for obtaining documentation from Cisco
Systems

World Wide Web

Preface

You can access the most current Cisco do cumentation on the World Wide Web at
the following URL:

http://www.cisco.com

Translated documen tati on is available at the fo llowing URL:

http://www.cisco.com/public/countries_languages.shtml

Documentation CD-ROM

Cisco documentation and additional literature are available in a Cisco
Documentation CD-ROM packag e, which i s shipped wit h your prod uct. The
Documentation CD-ROM is updated monthl y and may be more current than
printed documentat ion. The CD-ROM package is available as a single uni t or
through an annual subscription.

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Preface

Ordering Documentation

Cisco documentation is available in the following ways:

• Registered Cisco Direct Cu stome rs c an or de r Ci sco produ ct doc umen t ation

from the Networking Products MarketPlace:

http://www.cisco.com/cgi-bin/order/order_root.pl

• Registered Cisco.com u s ers can order the Documentation CD-ROM through

the online Subscription Stor e:

http://www.cisco.com/go/subscription

• Nonregistered Cisco.com users c an order docum entat ion through a local

account representa tive by calling Cisco corpora te hea dquarters (C alifo rnia,
USA) at 408 526-7208 or, elsewhere in North America, by calling 800
553-NETS (6387).

Documentation Feedback

Obtainin g Do cumentatio n

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If you are reading Cisco product doc umen tation on Cisco.co m, you can subm it
technical comments electronically. Click Leave Feedback at the bottom of the
Cisco Documentation home page. After you complete the form, print it out and
fax it to Cisco at 408 527-0730.

You can e-mail your comments to bug-do c@cisco. com.
To submit your co mment s by mai l, u se the resp onse ca rd be hind t he f ro nt c over

of your document, or write to th e following address:
Cisco Systems

Attn: Document Resour ce Connec tion
170 West Tasman Drive
San Jose, CA 95134- 988 3

We appreciate yo ur comm ents .

Catalyst 2950 Desktop Switch Hardware Installation Guide

xvii

Obtaining Technical Assistance

Obtaining Technical Assistanc e

Cisco provides Cisco.com as a starting point for all technical assistance.
Customers and par tner s ca n obta in d ocume nta tion, t roubl eshoo tin g ti ps, a nd
sample configurations from onlin e to ols b y using the Cisco Technical Assistance
Center (TAC) Web Site. Cisco.com regi st ered u s er s h ave compl et e acc es s t o th e
technical support resources on the Cisco TAC Web Site.

Cisco.com

Cisco.com is the foundat ion of a suite of interac tive, networked services th at
provides immediate, open a ccess to Cisco informa tion, net working solutions,
services, programs, and resources at any time, from anywhere in the world.

Cisco.com is a highly integrated Internet application and a powerful, easy-to-us e
tool that provides a broad range of featur es and servi ces to he lp you to

• Streamline business processes and improve productivity

• Resolve technical issues with online support

Preface

• Download and te st so ft war e pa ck ag es

• Order Cisco learning m ateri als and me rcha ndise

• Register for online skill assessment, training, and certification programs

You can self-register on Cisco.com to obtain customized information and ser vice.
To access Cisco.com, go to the following URL:

http://www.cisco.com

Technical Assistance Center

The Cisco TAC is availab le to all cu stome rs who nee d tec hnic al a ssistance with a
Cisco product, technology, or solution. T wo types of support are available through
the Cisco TAC: the Cisco TAC Web Site and the Cisco TAC Escalation Center.

Catalyst 2950 Desktop Switch Hardware Installation Guide

xviii

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Preface

Inquiries to Cisco TAC are categorized according to the urgency of the issue :

• Priority level 4 (P4)—You need information or assistance c once rnin g C isco

• Priority level 3 (P3)—You r network perf ormance is degraded. Network

• Priority level 2 (P2)—You r produc tion ne twork is severely degraded,

• Priority level 1 (P1)—Your production network is down, and a critical impact

Which Cisco TA C resource you choose is based on the priority of the problem and
the conditions of service contracts, when applicable.

Cisco TAC Web Site

The Cisco TAC Web Site allows you to resolve P3 and P4 issues yourself, saving
both cost and time. The site provides around-the-clock access to online tools,
knowledge bases, and software. To access the Cisco TAC Web Site, go to the
following URL:

Obtaining Technical Assistance

product capabilities, pro duct ins tallation , or basic pro duct configurat ion.

functionality is noticeably impaired, but most business operations continue.

affecting significant aspects of business ope rations. N o workaroun d is
available.

to business operations will occur if service is not restore d quickly. No
workaround is available.

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http://www.cisco.com/tac

All customers, partners, and resellers who have a valid Cisco services contract
have complete access to the technical support resources on the Cisco TAC Web
Site. The Cisco T A C Web Site requires a Cisco.com login ID and password. If you
have a valid service contract but do not have a login ID or password, go to the
following URL to register:

http://www.cisco.com/register/

If you cannot resolve your technical issues by using the Cisco TAC Web Site, and
you are a Cisco.com registered user, you can open a case online by using the TAC
Case Open tool at the following URL:

http://www.cisco.com/tac/caseopen

If you have Internet access, it is recom mended t hat you open P3 and P4 cases
through the Cisco TAC Web Site.

Catalyst 2950 Desktop Switch Hardware Installation Guide

xix

Obtaining Technical Assistance

Cisco TAC Escalation Center

The Cisco TAC Escalation Center addresses issues that are classified as priority
level 1 or priority level 2; these classifications are assigned when severe network
degradation significantly impacts business operations. When you contact the T A C
Escalation Center with a P1 or P2 pro blem, a Cisc o TAC engineer will
automatically open a case.

T o obtain a directory of toll-free Cisco TAC telephone numbers for your country,
go to the fo llowing URL :

http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml

Before calling, please check with your network operations center to determine the
level of Cisco support services to which your company is entitled; for example,
SMARTnet, SMARTnet Onsite, or Network Support ed Accoun ts (NSA). In
addition, pleas e have available your service agreement number and your product
serial number.

Preface

xx

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Features

CHAPTER

1

Overview

This chapter provides information about these topics:

• Switch features

• Front- and rear-panel descriptions

• Management options

The Catalyst 2950 swi tches a re st ack ab le Ethern et sw itch es t o w hic h y ou can
connect workstations and other network devices, such as servers, routers, and
other switches. The switches can be deployed as backbone s wi tches, aggregating
10BASE-T, 100BASE-TX, and Gigabit Ethern et traffic from other ne twork
devices. Refer to the Catalyst 2950 Desktop Switch Software Configuration Guide
for examples showing how you mig ht d ep loy the swi tches in y our net work.

Table 1-1 lists the switch features, and Figure 1- 1 throu gh Figure 1-8 show the

Catalyst 2950 switches.

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Catalyst 2950 Desktop Switch Hardware Installation Guide

1-1

Features

Table 1-1 Catalyst 2950 Switch Features

Feature Description

Hardware

• Catalyst 2950-12 switch—12 10 /100 Ether net ports

• Catalyst 2950-24 switch—24 10 /100 Ether net ports

• Catalyst 2950C-24 sw itch—24 10 /100 Eth erne t po rts and

2 100BASE-FX ports

Chapter 1 Overview

• Catalyst 2950G-12-E I—12 10/ 100 Ether net po rts and

2GBIC

• Catalyst 2950G-24-E I—24 10/ 100 Ether net po rts and

1

-based Gigabit Et herne t m odu le sl ots

2 GBIC-based Gigabit Ethern et mo dule slots

• Catalyst 2950G-24-EI-DC

2

—24 10/100 Ethernet ports and
2 GBIC-based Gigabit Ethern et modul e slots with DC -input
power

• Catalyst 2950G-48-E I—48 10/ 100 Ether net po rts and

2 GBIC-based Gigabit Ethern et mo dule slots

• Catalyst 2950T-24 switch—24 10/100 Ethernet ports and

2 10/100/1000 Ethernet por ts

• On Catalyst 2950 G-12- EI , 295 0G -24 -EI, 29 50G- 24-EI -D C, a nd

2950G-48-EI switches, sup port fo r these GBIC mod ules:

–

1000BASE-SX GBIC

–

1000BASE-LX/LH GBIC

–

1000BASE-ZX GBIC

–

GigaStack GBIC

1-2

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 1 Overview

Front-Panel Description

Table 1-1 Catalyst 2950 Switch Features (continued)

Feature Description

Configuration • Autonegotiates the speed and duplex settings on 10/100 ports and

on 10/100/1000 ports

• Supports only 100-Mbps and full-duplex settings on

100BASE-FX ports

• Supports 8192 MAC addresses

• Checks for errors on a received packet, determines the destination

port, stores th e pa cket i n sh ar ed m emo ry, and then forwar ds t he
packet to the destination port

Power redundancy

1. GBIC = Gigabit Interface Converter

2. DC = direct current

3. AC = alternating current

• Connection for an op tio nal Ci sco R PS 30 0 Red undan t Power

System (RPS) that uses AC

3

input and supplies D C ou tput to th e

switch

Front-Panel Description

The switch front panel contains the ports, the LEDs, and the Mode button.

Figure 1-1 to Figure 1-8 show the switches.

Figure 1-1 Catalyst 2950-12 Switch

SYST

1x

RPS

2x

3x

STAT

UTIL

DUPLX

SPEED

MODE

78-11157-02

4x

5x

6x

7x

8x

10/100 ports

10Base-T / 100Base-TX

9x

10x

11x

12x

Catalyst 2950 Desktop Switch Hardware Installation Guide

Catalyst 2950

SERIES

45568

1-3

Front-Panel Description

Figure 1-2 Catalyst 2950-24 Switch

SYST

1

RPS

2

3

STAT

UTIL

DUPLX

SPEED

MODE

4x

5x

6x

7x

8x

10Base-T / 100Base-TX

9x

10x

11x

12x

13x

14x

15x

16x

17x

10/100 ports

Figure 1-3 Catalyst 2950C-24 Switch

SYST

1x

RPS

2x

3x

STAT

UTIL

DUPLX

SPEED

MODE

4x

5x

6x

7x

8x

10BASE-T / 100BASE-TX

9x

10x

11x

12x

13x

14x

15x

16x

17x

Chapter 1 Overview

18x

19x

20x

18x

19x

20x

Catalyst 2950

21x

21x

SERIES

22x

23x

24x

Catalyst 2950

SERIES

22x

23x

100BASE-FX

24x

25

26

45567

45570

10/100 ports

Figure 1-4 Catalyst 2950G-12-EI Switch

1

2

3

4

SYST

STAT

UTIL

DUPLX

MODE

5

6

1X

7

RPS

SPEED

8

9

10

11

12

2X

11X

12X

10/100 ports

GBIC module

Catalyst 2950 Desktop Switch Hardware Installation Guide

1-4

100BASE-FX ports

1

Catalyst 2950

2

SERIES

slots

60978

78-11157-02

Chapter 1 Overview

Figure 1-5 Catalyst 2950G-24-EI Switch

1

2

3

4

SYST RPS

STAT

UTIL

MODE

DUPLX

5

6

1X

7

8

9

10

11

12

SPEED

2X

13

11X

14

15

16

17

18

13X

19

20

21

22

23

24

12X

14X

23X

24X

1

10/100 ports

GBIC module

slots

Figure 1-6 Catalyst 2950G-24-EI-DC Switch

1

2

3

4

SYST

STAT

UTIL

DUPLX

MODE

5

6

1X

7

RPS

SPEED

8

9

10

11

12

13

11X

14

15

16

17

18

13X

19

20

21

2X

12X

14X

22

23

24

23X

24X

1

10/100 ports

Catalyst 2950

2

Catalyst 2950

2

Front-Panel Description

SERIES

SERIES

60977

60977

GBIC module

Figure 1-7 Catalyst 2950G-48-EI Switch

1

2

3

SYST

4

5

6

1X

RPS
STAT
UTIL
DUPLX
SPEED

MODE

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

15X

22

17X

23

24

25

26

2X

16X

18X

27

28

29

30

31

32

33

34

35

36

37

31X

38

33X

39

40

32X

34X

10/100 ports

78-11157-02

slots

41

42

43

44

45

Catalyst 2950

46

47

48

SERIES

47X

1

48X

2

GBIC module

slots

Catalyst 2950 Desktop Switch Hardware Installation Guide

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1-5

Front-Panel Description

Figure 1-8 Catalyst 2950T-24 Switch

SYST RPS

1x

2x

3x

STAT

UTIL

DUPLX

SPEED

MODE

4x

5x

6x

7x

8x

10Base-T / 100Base-TX

9x

10x

11x

12x

13x

14x

15x

16x

17x

10/100 ports

10/100 Ports

The 10/100 port s use RJ-4 5 c on nector s a nd tw iste d-pa ir c abl ing. The p orts ca n
connect to th ese device s:

• 10BASE-T- compa ti ble devices, su ch as workst ati ons an d hubs , th rough

standard RJ-45 connecto rs and two twist ed-pa ir cabling. You can use
Category 3, 4, or 5 c a bling.

18x

19x

20x

21x

22x

23x

10/100/1000 ports

Catalyst 2950

24x

SERIES

10/100/100Base-T

1

Chapter 1 Overview

2

47337

1-6

• 100BASE-TX-compatible devices, such as high-speed workstations, servers,

hubs, routers, and other switches, through standard RJ-45 connectors and two
or four twisted- pair, Category 5 cab lin g.

Note When connecting the switch to workstations, servers, and routers, be sure that

the cable is a t wisted-pair straigh t-through cable. When connec ting the switch
to hubs or other sw itch es, u se a tw isted- pair cro ssover cable. Pin outs for the
cables are described in Appendix B, “Connectors an d Cables. ”

The 10/100 por ts c an be explici tly se t t o opera te in any c om bina tio n of ha lf
duplex, full duplex, 10 Mb ps, or 1 00 Mbps. They c an a lso be set fo r spe ed and
duplex autonegotiation, compliant with IEEE 802.3U. In all cases, the cable
length from a switch to an attached device cannot exceed 328 feet (100 meters).

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 1 Overview

When set for autonegotiation, a port sense s the speed a nd duplex settings of the
attached device and advert ises its o wn capabilities. If the attached de vice supports
autonegotiation, the port negotiates the best connection (that is, the fastest line
speed that both devices s uppo rt a nd f ull -dupl ex transm issio n, i f t he a ttac hed
device supports it) and configures itsel f accor dingly.

100BASE-FX Ports

The 100BASE-FX ports use 50/125- or 62.5/125-micron multimode fiber-optic
cabling. These p ort s onl y op er at e a t 1 00 Mb ps in f ull -du plex mo de .

In full-duplex mode (the default), the cable length from a switch to an attached
device cannot exceed 656 2 f eet ( 2 kilo me ter s).

You can co nnect a 10 0BASE-FX port to an SC or ST port on a ta rget device by
using one of the MT-RJ fiber -optic patch cables listed in Table 1-2. Use the Cisco
part numbers in Table 1-2 to order the pat ch cabl es that you need.

Table 1-2 MT-RJ Patch Cables for 100BASE-FX Connections

Front-Panel Description

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Ty pe Cisco Part Number

1-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-1M
3-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-3M
5-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-5M
1-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-1M
3-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-3M
5-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-5M

Catalyst 2950 Desktop Switch Hardware Installation Guide

1-7

Front-Panel Description

10/100/1000 Ports

The 10/100/1000 ports on Ca talyst 2950T-24 switches use RJ-45 connectors a nd
twisted-pair cabling. The ports can connect to these devices:

• 10BASE-T- compa ti ble devices, su ch as workst ati ons an d hubs , th rough

• 100BASE-TX-compatible devices, such as high-speed workstations, servers,

• 1000BASE-T-c ompa tible devices, such as high-sp eed workstat ions, ser vers,

Note When connectin g to a 1000BASE- T-compatible device, be sur e t o u se a fo ur

twisted-pair, Category 5 cable.

Chapter 1 Overview

standard RJ-45 connect ors and t wo or four twist ed-pa ir, Category 5 cabling.

hubs, routers, and other switches, through standard RJ-45 connectors and two
or four twisted- pair, Category 5 c abl ing.

hubs, routers, and other switches, through standard RJ-45 connectors and four
twisted-pair, Category 5 cabling.

1-8

Note When connecting the switch to workstations, servers, and routers, be sure that

the cable is a t wisted-pair straigh t-through cable. When connec ting the switch
to hubs or other sw itch es, u se a tw isted- pair cro ssover cable. Pin outs for the
cables are described in Appendix B, “Connectors an d Cables. ”

The 10/100/1000 ports on Catalyst 2950T-24 switches can be explicitly set to
operate at 10 or 100 Mb ps in h alf- o r full -d uplex mode o r at 100 0 Mbps in
full-duplex mode. The default duplex setting is full duplex. They can also be set
for speed and duplex autonegotiation, compliant with IEEE 802.3AB. In all cases,
the cable length from a switch to an attached device cannot exceed 328 feet
(100 meters).

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 1 Overview

GBIC Module Ports

The GBIC module slots suppor t these mo dules:

• 1000BASE-SX GBIC module for fiber-optic connect ions that cannot exceed

1804 feet (550 meters).

• 1000BASE-LX/LH GBIC modu le for fiber-optic c on nect ions tha t c an not

exceed 32,810 fe et (1 0 kil o me ter s) .

• 1000BASE-ZX GBIC module for fiber-optic connections that cannot exceed

328,100 feet (100 kilome ters).

• GigaStack GBIC mo dule for c reati ng a 1- Gbps st ack co nfigurati on of u p t o

nine supported switches. The GigaStack GBIC supports one full-duplex link
(in a point-to-point co nfigurati on ) or up t o nin e h alf-dup l ex links (i n a s tack
configuration) to ot h er G igab it Ethe rn et devices. Us ing the re qui red C isco
proprietary signaling an d ca bli ng, the Gi gaStac k GBIC- to-Gi gaSta ck GB IC
connection cannot exceed 3 feet (1 meter).

For more informati on abou t the se GBIC s, re fer t o your G BI C d ocu ment at ion.

Front-Panel Description

LEDs

78-11157-02

You ca n use the L EDs to mon ito r s witc h ac tivity and perf orm ance . Fi gure 1-9,

Figure 1-10, and Figure 1-11 show the location of the LEDs and the Mode b u tton

that you use to select the por t mode. Cha ngi ng the port mode chang es the
information provided by each port status LED .

All of the LEDs described in this section except the utilization meter (UTIL) are
visible in the Cluster Manageme nt Suite (CM S). The Cat alyst 2950 Desktop
Switch Software Configuration Guide describes how to use CMS to manage
individual switches and sw itch cl usters.

Catalyst 2950 Desktop Switch Hardware Installation Guide

1-9

Front-Panel Description

Figure 1-9 LEDs on Catalyst 2950-12, 2950-24, 2950C-24, and 2950T-24 Switches

Chapter 1 Overview

System

LED

Port mode

LEDs

SYST

STAT

UTIL

DUPLX

MODE

Mode button

RPS

LED

RPS

SPEED

1x

Port status

2x

LEDs

3x

4x

5x

6x

52918

1-10

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Chapter 1 Overview

Front-Panel Description

Figure 1-10 LEDs on Catalyst 2950G-12-EI, 2950G-24-EI, and 2950G-24-EI-DC Switches

System

LED

Port mode

LEDs

RPS

LED

SYST RPS

STAT

UTIL

DUPLX

SPEED

MODE

Mode button

Port status

LEDs

1

2

3

4

5

1X

2X

6

7

8

9

10

11

12

11X

12X

65395

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1-11

Front-Panel Description

Figure 1-11 LEDs on Catalyst 2950G-48-EI Switches

System

LED
RPS

LED

Port

mode

LEDs

SYST
RPS
STAT
UTIL
DUPLX
SPEED

MODE

1

2

3

4

5

1X

2X

6

Port status

LEDs

7

8

Chapter 1 Overview

9

10

11

12

13

14

15

16

15X

System LED

Mode button

The system LED shows whether the system is receiving power and functioning
properly. Table 1-3 lists the LED colors and meanings.

Table 1-3 System LED

Color System Status

Off System is not powered up.
Green System is operating nor mally.
Amber System is receiving power but i s n ot f unc tioni ng p roper ly.

For information about the system LED colo rs during the power-on self-test
(POST), see the “Running POST” section on page 2-29.

16X

65508

1-12

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Chapter 1 Overview

RPS LED

Front-Panel Description

The RPS LED shows the RPS status. Table 1-4 lists the LED colors and meanings.

Table 1-4 RPS LED

Color RPS Status

Off RPS is off or is not inst alle d.
Solid green RPS is connected and r eady to pr ovide bac k-up power.
Flashing green RPS is connected but is unavailable because it is providing

power to another device (redundancy has been alloc ated to a
neighboring device).

Solid amber RPS is in standby mode or in a fault condition. Press the

Standby/Active button on the RPS, and the LED should turn
green. If it does not, the RPS fan could have failed. Contact
Cisco Systems.

Flashing amber T he in tern al power supply in a switc h h as failed , and t he R PS

is providing power to the switch (redunda ncy has been
allocated to this device).

For more information abou t the Cisc o RPS 300, ref er t o the C isco RPS 300
Redundant Power System Hardware Installation Guide.

Port Mode and Port Status LEDs

Each port has a port status LED, also call ed a port LED. These LEDs, as a group
or individually, display information about the switch and the indi vidual ports. Th e
port modes (see Table 1-5) determine the type of information displayed.

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Catalyst 2950 Desktop Switch Hardware Installation Guide

1-13

Chapter 1 Overview

Front-Panel Description

Table 1-5 Port Mode LEDs

Mode LED Port Mode Description

STAT Port status The port status. This is the default mode.
UTIL Switch utilization The current bandwidth in use by the switch.
DUPLX Port duplex mode The port dupl ex mode : ha lf d uplex o r full d upl ex.
SPEED Port speed The port operating speed: 10 or 100 Mbps for 10/100 ports

and 10, 100, or 1000 Mbps for 10/100/1 000 ports.

To select or change the po rt mode , press the Mo de button (see Figure 1-12,

Figure 1-13, and Figure 1-14) to highl ight the mode that you want. Relea se the

button to enable the highlighted mode.

Figure 1-12 Changing the Port Mode on Catalyst 2950-12, 2950-24, 2950C-24,

and 2950T-24 Switches

1-14

SYST

STAT

UTIL

DUPLX

MODE

RPS

SPEED

1x

2x

Mode button

Catalyst 2950 Desktop Switch Hardware Installation Guide

3x

4x

5x

6x

52917

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Chapter 1 Overview

Front-Panel Description

Figure 1-13 Changing the P or t Mode on Catalyst 2950 G-12-EI, 2950G-24-E I, and

2950G-24-EI-DC Switches

1

2

3

4

SYST RPS

STAT

UTIL

DUPLX

SPEED

1X

5

6

7

8

9

10

11

12

11X

MODE

Mode button

2X

12X

65393

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Catalyst 2950 Desktop Switch Hardware Installation Guide

1-15

Front-Panel Description

Chapter 1 Overview

Figure 1-14 Changing the Port Mode on Catalyst 2950G-48-EI Switches

1

2

SYST
RPS
STAT
UTIL
DUPLX
SPEED

MODE

1X

2X

3

4

5

6

7

8

9

10

11

12

13

14

15

16

15X

Mode button

16X

65509

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Chapter 1 Overview

Front-Panel Description

When you change th e po rt m ode, th e m ean ing s o f th e por t L ED col o rs cha ng e .

Table 1-6 explains how to interpret these colors.

Table 1-6 Meaning of Port LED Colors in Different Modes

Port Mode Color Meaning

STAT (port status) Off No link.

Solid green Link present.
Flashing green Activity. Port is transmitting or receiving data.
Alternating

green-amber

Solid amber Port is not forwa rding. Port was disa bled by managem ent, an

UTIL (utilization) Green The current backplane utilization that is displayed over the

Amber The maximum backplane utilization since the switch was

Green and
amber

DUPLX Off Port is operating in half duplex.
(half or full duplex) Green Port is operati ng in full duplex.

Link fault. Error frames can a ffec t connecti vity, and errors such
as excessive collisions, CRC errors, and alignment and jabber
errors are monitored for a link-fault indication.

address violation , or Spa nning Tree Protoc ol ( STP).

Note After a port is re c onfigured , the po rt L ED ca n

remain amber for up to 30 seconds while STP
checks the switch for possible loops.

amber LED ba ck gro und o n a lo gar ithm i c sc ale .

powered on.
See Figure 1-15 to Figure 1-18 for details.

Note If the current utilization exceeds the maximum

utilization, the maximum utilization is
automatically updated.

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Catalyst 2950 Desktop Switch Hardware Installation Guide

1-17

Front-Panel Description

Table 1-6 Meaning of Port LED Colors in Different Modes (continued)

Port Mode Color Meaning

SPEED (speed) 10/100 ports

Off Port is operating at 10 Mbps.
Green Port is oper ating at 10 0 Mbps.
10/100/1000 ports
Off Port is operating at 10 Mbps.
Green Port is oper ating at 10 0 Mbps.
Flashing green Port is operating a t 1000 Mbps.
1000BASE-X GBIC module ports
Off Port is not operating.
Green Port is ope rating a t 1000 Mbps.

For more informati on abou t GBIC L EDs , r ef er t o you r GB IC docum en tati on.

Chapter 1 Overview

1-18

Figure 1-15 to Figure 1-18 show the bandwidth utilizati on per cent ages disp lay ed

by the ri gh t -m o st LED s .
If all LEDs on Catalyst 2950-12, 2950-24, 2950C-24, and 2950T-24 switches are

green (no amber showing), the switch is using 50 percent or more of the total
bandwidth. If the far-right LED is off, the switch is using more than 25 but less
than 50 percent of the total bandwidth, and so on. If only the far-left LED is green,
the switch is using less than 0.0488 percent of the total bandwidth. (See

Figure 1-15.)

If all LEDs on Catalyst 2950G-12-EI switches are green (no amber showing), the
switch is using 50 percen t or more o f the total ba ndwidt h. If the LE D for GB IC
module slot 2 is off , the switch is using more than 25 but less than 50 percent of
the total bandwidt h . If LE Ds f or bo th G BI C m odul e sl ots a re o ff, the switc h is
using less than 25 percent of the to tal bandw idth, and so on. (See Figure 1-16.)

If all LEDs on C ata lyst 2950 G- 24-EI a nd 29 50G -24-E I- DC sw itch es are gre en
(no amber showing), the switch is using 50 percent or more of the total bandwidth.
If the LED for GBIC module slot 2 is off, the switch is using more than 25 but less
than 50 percent of the total bandwidth. If LEDs for both GBIC module slots are
off, the switch is using less than 25 percent of the total bandwidth, and so on. (See

Figure 1-17.)

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 1 Overview

Front-Panel Description

If all LEDs on Catalyst 2950G-48-EI switches are green (no amber showing), the
switch is using 50 percent or more of the total bandwidth. If the LED for the upper
GBIC module slot is of f, th e switch i s us ing more tha n 25 bu t less than 50 perce nt
of the total bandwidth. If LEDs for both GBIC module slots are off, the switch is
using less than 25 percent of the to tal bandw idth, and so on. (See Figure 1-18.)

Figure 1-15 Bandwidth Ut iliza tion on Catal yst 2950-1 2, 2950-2 4, 2950C-2 4, and

2950T-24 Switches

Catalyst 2950 SERIES

SYST RPS

DUPLX

MODE

1x 2x 3x 4x 5x 6x 7x 8x 9x 10x 11x 12x

SPEEDUTILSTAT

0–0.0487%+

6.25–12.4%+

12.5–24%+
25–49%+
50%+

10Base-T / 100Base-TX

78-11157-02

Figure 1-16 Bandwidth Utilization on Catalyst 2950G-12-EI Switches

1

SYST RPS

STAT

UTIL DUPLX SPEED

2 3 4 5 6 7 8 9 10 11 12

1X

2X

MODE

11X

12X

1

Catalyst 2950

2

< 25% +
25% – 49% +
50% +

Catalyst 2950 Desktop Switch Hardware Installation Guide

65397

1-19

Rear-Panel Descripti on

Chapter 1 Overview

Figure 1-1 7 Bandwidth Utilization on Catalyst 2950G-24-EI and 29 50G-24-EI-DC

Switches

1

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

SYST RPS

STAT

UTIL DUPLX SPEED

MODE

1X

2X

11X

13X

12X

14X

15X

16X

1

< 25% +

25% – 49% +

50% +

Figure 1-18 Bandwidth Utilization on Catalyst 2950G-48-EI Switches

Catalyst 2950

2

65396

1

2 3 24 5 6 7 8 9 10 1112 13 14 15 16 17

1X

SYST
RPS
STAT
UTIL
DUPLX
SPEED

2X

MODE

Rear-Panel Description

Other than the Catalyst 2950G-24-EI-DC switch, the rear panel of a Catalyst 2950
switch has an AC power connector, an RPS connector, and an RJ-4 5 co nsole por t.
(See Figure 1-19 and Figure 1-20.)

The rear panel of the Catalyst 2950G-24-EI-DC switch has a DC power connector
(also referred to as the ter minal block hea der), a D C ground lug, an RPS
connector, and an RJ-45 console port . (See Figure 1-21.)

18 1920 21 22 23 24 25 26 2728 29 31 31 32 33

15X

17X

16X

18X

< 25% +
25% – 49% +

50% +

34 3536 37 38 39 40 41 42 4344 45 46 47 48

31X

33X

32X

34X

Catalyst 2950

47X

48X

1

2

65510

1-20

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Chapter 1 Overview

Figure 1-19 Catalyst 2950 Switch Rear Panel

Rear-Panel Description

RATING

100-127V~

@ 1A

200-240V~

@0.5A

50-60Hz

DC INPUT FOR REMOTE

POWER SUPPLY

SPECIFIED IN MANUAL.

+12V @4.5A

CONSOLE

AC power
connector

RPS

connector

Fan

RJ-45

console port

Figure 1-20 Catalyst 2950G-48-EI Switch Rear Panel

RATING

100-127V~

@ 1A

200-240V~

@0.5A

50-60Hz

DC INPUT FOR REMOTE

POWER SUPPLY

SPECIFIED IN MANUAL.

+12V @4.5A

CONSOLE

AC power
connector

RPS

connector

Fan

exhaust

RJ-45

console port

45585

65511

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1-21

Rear-Panel Descripti on

Figure 1-21 Catalyst 2950G-24-EI-DC Switch Rear Panel

Chapter 1 Overview

36 - 72V

1 - 0.5A

A
B

DC INPUT FOR REMOTE

POWER SUPPLY

SPECIFIED IN MANUAL.

+12V @4.5A

DC power connector

RPS

connector

Fan

RJ-45

console

Power Connectors

You ca n provide power t o a switc h by usi ng t he AC intern al p ower su pply, the
DC-input power source, or the Ci sco RPS.

Internal Power Supply Connector

The internal AC po we r supply is an autorangin g unit that supports input voltages
between 100 and 240 VAC. Other than for the Catalyst 2950G-24-EI-DC switch,
use the supplied AC power cord to connect the AC power connector to an AC
power outlet.

CONSOLE

port

65291

DC

ground

lug

DC Power Connector

The Catalyst 2950G-24-EI-DC switch has an internal DC-power conve rter. It has
dual feeds (A an d B ) t h at ar e di od e-OR -e d in to a si n gle power bl ock. For
installation instructions, see the “Connecting to DC Pow er” section on page 2-20.

Caution You must connect the Cataly st 2950G -2 4-EI- DC sw itch o nly to a DC- input

power source that has an input supply voltage fr om –36 to –72 VDC. If the
supply voltage is not in this range, the switch might not operate properly or
might be damaged .

Catalyst 2950 Desktop Switch Hardware Installation Guide

1-22

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Chapter 1 Overview

Cisco RPS Connector

The RPS is a 300W redundant power system that can support six external network
devices and provides DC power to one failed device at a time. It automatically
senses when the int erna l power sup pl y of a c onnec ted device fai ls and pr ovides
power to that device, preventing loss of network traffic.

Managemen t Opt io ns

Warning

Attach only the Cisco RPS 300 (model PWR300-AC-RPS-N1) to the RPS
receptacle.

For more information abou t the Cisc o RPS 300, ref er t o the C isco RPS 300
Redundant Power System Hardware Installation Guide.

Console Port

You can co nnect a sw itch to a PC thr ough the c onsole por t and th e supplied
rollover cable and DB-9 adapter. If you want to connect a switch to a terminal,
you need to provi de an RJ- 45 - to -DB - 25 female DTE adapter. Y o u can or d er a kit
(part number ACS-DSBUASYN=) with that adapter from Cisco. For console-port
and adapter-pinout in for mat ion, se e t he “Cable and Adapter Specifications”

section on page B-6.

Management Options

Catalyst 2950 switches offer these mana geme nt o ptions:

• Cluster Management Suite (CM S)

CMS is made up o f th ree w eb-ba sed a pp lica tions t h at you use to m anage
switches. You can use Cluster Builder, which includes Cluster View, and
Cluster Manager to creat e, configure, an d monit or switch clust ers. You can
also use Device Manager to manage individual and standalone switches. For
more information , refe r to the Cataly st 2950 Desktop Switch Software
Configuration Guide and the CMS online help.

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Catalyst 2950 Desktop Switch Hardware Installation Guide

1-23

Management Options

Chapter 1 Overview

• IOS command-line interface (CLI)

You can manage switches by us ing c ommand- line en tries. To access the CLI,
connect a PC or terminal directly to the cons ole port on the switc h rear panel.
If the switch is attached to your network, you can use a Telnet connection to
manage the switch from a rem ote location. For more inf ormation, r efer to the
Catalyst 2950 Desktop Sw itch Comm and R efe rence.

• CiscoView application

You can use the CiscoView device-management application to set
configuration paramete rs and to view switch stat us and perf orman ce
information. This ap plica tion, which you pu rchase sep arate ly, can be a
standalone application or part of an Simple Network Management Protocol
(SNMP) network-mana gement platfo rm. For more i nform ation , refer to the
documentation t hat cam e w ith your Ci scoView application.

• SNMP network management

Y ou can manage switches by using an SNMP-compatible management station
running platforms such as HP OpenView and SunNet Manager. The switch
supports a compre hensive set of M IB extens ions an d MI B I I, the
IEEE 802.1D bridge MIB, a nd four RMON gro ups. For more in formati on,
refer to the document ation tha t came with your SNMP appli cation.

1-24

Catalyst 2950 Desktop Switch Hardware Installation Guide

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CHAPTER

2

Installation

This chapter describes how to install your Catalyst 2950 switch, interpret the
power-on self-test (POST), a nd c onn ect the switch t o oth er devices. R ead the se
topics and perf orm th e pro cedu re s in t his o rde r:

• Pre-installation information and guidelines

• Installation procedures

• Power-on procedures

• Connection proced ure s

• Where to go next

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Catalyst 2950 Desktop Switch Hardware Installation Guide

2-1

Preparing for Instal la t io n

Preparing for Installation

This section provides infor mati on about th ese topics :

• Warnings

• EMC regulatory statements

• Installation guidelines

• Verif ying pack age c ontent s

Warnings

These warnings are translated in to se veral languages in Appendix C, “Translated

Safety Warnings.”

Chapter 2 Installation

Warning

Warning

Warning

Warning

Warning

Only trained and qualified personnel should be allowed to install or replace
this equipment.

Read the installation instructions before you connect the system to its power
source.

Unplug the power cord before you work on a system that does not have an
on/off switch.

Do not stack the chassis on any other equipment. If the chassis falls , it can
cause severe bodily injury and equipment damage.

To prevent the switch from overheating, do not operate it in an area that
exceeds the maximum recommended ambient temperature of 113
To prevent airflow restriction, allow at least 3 inches (7.6 cm) of clearance
around the ventilation openings.

°

F (45°C).

2-2

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Chapter 2 Installation

Preparing for Installation

Warning

Warning

Warning

Warning

Warning

Warning

The device is designed to work with TN power systems.

When installing the unit, always make the ground connection first and
disconnect it last.

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).

This equipment is intended to be grounded. Ensure that the host is
connected to earth ground during normal use.

Care must be given to connecting units to the supply circuit so that wiring is
not overloaded.

A voltage mismatch can cause equipment damage and may pose a fire
hazard. If the voltage indicated on the label is different from the power
outlet voltage, do not connect the chassis to that receptacle.

78-11157-02

Warning

Do not touch the power supply when the power cord is connected. For
systems with a power switch, line voltages are present wi thi n the power
supply even when the power 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.

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-3

Preparing for Instal la t io n

Chapter 2 Installation

Warning

Warning

Warning

Warning

Warning

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
weld the metal object to the terminals.

Do not work on the syst em or connect or disconnect cables during periods
of lightning activity.

Ultimate disposal of this product should be handled according to all national
laws and regulations.

Attach only the Cisco RPS (model PWR300-AC-RPS-N1) to the RPS
receptacle.

Class 1 laser product

Avoid exposure to the laser beam.

EMC Regulatory Statements

This section includes specific regulato ry statement s about th e Catalyst 295 0
switches.

U.S.A.

U.S. regulatory information for this product is in the front matter of this manual.

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-4

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Chapter 2 Installation

Taiwan

Japan

Preparing for Installation

This is a Class A Information product. When used in a resid ential environment, it
may cause radio frequency interference. Under such circumstances, the user may
be requested to take appro pria te count ermea sures.

5456

This is a Class A product based on the standard of the Voluntary Control Council
for Interference by Information Technology Equipment (VCCI). If this equipment
is used in a domestic environment, radio disturbance may arise. When such
trouble occurs, the use r may be requi red to take co rrec tive actions.

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Catalyst 2950 Desktop Switch Hardware Installation Guide

2-5

Preparing for Instal la t io n

Korea

Chapter 2 Installation

Hungary

Warning

This is a Class A Device and is registered for EMC requirements for
industrial use. The seller or buyer should be aware of this. If this type was
sold or purchased by mistake, it should be replaced with a residential-use
type.

This equipment is a Class A p roduc t a nd should b e use d and i nsta lled pr operly
according to the Hungarian EMC Class A requirements (MSZEN55022). Class A
equipment is designed for typical commercial establishments for which special
conditions of install ation and pro tect ion distan ce are use d.

Figyelmezt et és a felhaszn álói kézikönyv számára:
Ez a berendez és “A” osztályú termék, fel hasz nálására és üzembe helyezésére a
magyar EMC “A” osztályú követelményeknek (M SZ EN 55022) megfeleloe n
kerülhet sor, illetve ezen “A” osztályú berendezések csak m egf elelo kere skede lmi
forrásból származhat nak , amel yek biz tosítják a megfelelo speciális üzembe
helyezési körülményeket és biztonságos üzemel ési t ávolságok a lka lmazását.

2-6

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Chapter 2 Installation

Installation Guidelines

When determining where to place the switch, observe these guidelines. (See

Appendix A, “Technical Specifications.” for detailed specifications.)

• For 10/100 ports and 10/100/1000 ports, the cable length from a switch to an

attached device c annot excee d 32 8 fee t ( 100 m eters) .

• For 100BASE-FX ports, the cable length from a switch to an attached device

cannot exceed 6562 feet (2 kilome ters) fo r full-d uplex connect ions.

• For the GBIC module ports, follow these guidelines:

–

The cable length from a 1000BASE-SX GBIC to an attached device
cannot exceed 1804 feet (550 mete rs).

–

The cable length from a 1000BASE-LX/LH GBIC to an attached device
cannot exceed 32, 810 fee t ( 10 kil om eters) .

–

The cable l engt h from a 1 000 BASE-ZX GBI C to a n att ach ed device
cannot exceed 328,100 fe et (100 kilo meter s).

–

The cable lengt h fr om a G igaSta c k GBI C t o an at tac hed device cann ot
exceed 3 feet (1 met e r) .

Preparing for Installation

78-11157-02

• Operating en viron ment is wi thin th e rang es listed in Appendix A, “Technical

Specifications.”

• Clearance to front and rear panels meet these conditions:

–

Front-panel LEDs can be ea sily rea d.

–

Access to ports is sufficient for unrestricted cabling.

–

Rear-panel AC power connector is with in rea ch of an AC power outlet.

–

Rear-panel DC power connector is within reach of a circuit breaker.

• Airflow around the switch and throug h the vents is unrestr icted.

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-7

Preparing for Instal la t io n

• Temperature around the unit does not exceed 113°F (45°C).

Note If the switch is installed in a closed or multirack assembly, the

temperature aro und i t m ight be gr eat er t han no rma l r oom

temperature.

• Cabling is away from sources of electrical noise, such as radios, power lines,

and fluoresce nt l igh t ing fixtur es .

Verifying Package Contents

Note Carefully remove the content s from th e shippin g contai ner, and check each

item for damage. If any item is missin g or damage d, conta ct your Cis co
representative or reseller for support. Return all packing materials to the
shipping container and save them.

Chapter 2 Installation

2-8

Your Catalyst 2950 switch is shipped with these items:

• This Catalyst 2950 D eskt op S wi tch Hardware Installation Guid e

• Where to Find the Catalyst 2950 Documentation flyer

• Cisco Documentation CD-ROM

• AC power cord

• Mounting kit containing these items:

–

Four rubber feet for mounting th e switch on a table, shel f, or desk

–

Two 19-inch or 2 4-inc h ra c k-mount ing b ra ckets

–

Six number-8 Phillips flat-head screws for attaching the brackets to the
switch

–

Four number-8 Phillips truss-head screws for attaching the brackets to
the switch

–

Four number-12 Phillips machine screws for attaching the brackets to a
rack

–

One cable guide and one black Phillips machine screw for attaching the
cable guide to on e of the m oun ting bra ckets

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 2 Installation

Note The DC-switch kit ships only with the Catalyst 2950G-24-EI-DC switch.

Preparing for Installation

• DC-switch kit containing these items:

–

One DC term inal bl ock pl ug ( als o c all ed a te rm inal bl ock he ad er)

–

One ground lug

–

Two number-10-32 screws for attaching the ground lug t o the switch

–

Two 23-inch rack-mou nti ng brac kets ( with 1-in ch spac ing for Telco
racks)

–

Four number-8 Phillips truss-head screws for attaching the brackets to
the switch

–

Two number-12 Phillips machine screws for attaching the brackets to a
rack

• One RJ-45-to-RJ-45 ro llover cab le

• One RJ-45-to-DB-9 fema le adap ter

• Cisco Information Packet, cont aini ng warrant y, safety, and support

information

78-11157-02

If you want to connect a terminal to the swi tc h console port, you ne ed to provide
an RJ-45-to-DB -25 fem ale D TE ad apte r. Yo u ca n ord er a k it (part num be r
ACS-DSBUASYN=) with that adapter from Cisco.

You can co nnect a 10 0BASE-FX port to an SC or ST port on a ta rget device by
using one of the MT-RJ fiber -optic patch cables listed in Table 2-1. Use the Cisco
part numbers in Table 2-1 to order the pat ch cabl es that you need.

Table 2-1 MT-RJ Patch Cables for 100BASE-FX Connections

Ty pe Cisco Part Number

1-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-1M
3-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-3M
5-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-5M
1-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-1M
3-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-3M
5-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-5M

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-9

Installing the Switch in a Rack

Installing the Switch in a Rack

Chapter 2 Installation

Warning

Note Figure 2-1 to Figure 2-14 show the Catalyst 2950-2 4, 2950G -24-EI- DC, an d

T o prevent bodily injury when mounting or servicing this unit in a rack, you
must take special precautions to ensure that the system remains stable.
The following guidelines are provided to ensure your safety:

• This unit should be mounted at the bottom of the rack if it is the only unit

in the rack.

• When mounting this unit in a partially filled rack, load the rack from the

bottom to the top with the heaviest component at the bottom of the rack.

• If the rack is provide d with stabiliz ing de vic es, install t he stabiliz ers befor e

mounting or servicing the unit in the rack.

2950G-48-EI switches as examples. You can install other Catalyst 295 0
switches in a rack as shown in these illustrations.

To install the switch in a 19-, 23-, or 24-inch rack, follow these steps:

• Attaching the brackets to the switch

• Mounting the switch in a rack

• Attaching the optional cable guide

Attaching the Brackets to the Switch

The bracket ori ent ation a nd the sc rews that yo u use de pend on wh et her you are
attaching the brackets to a 19-, 23-, or 24-inch rack. Follow these guidelines:

• When mounting a switch other than a Catalyst 2950G-48-EI switch in a

19-inch rack, use two of the Phillips flat-head screws to attach the long side
of the 19- or 24-inch bracket to the sw itch. See Figure 2-1, Figure 2-2, and

Figure 2-3.

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-10

78-11157-02

Chapter 2 Installation

Installing the Switch in a Rack

• When mounting a Catalyst 2950G-48-EI switch in a 19-inch rack, use three

of the Phillips flat-head screws to attach the long side of the 19- or 24-inch
bracket to the switch. See Figure 2-4, Figure 2-5, and Figure 2-6.

• When mounting a Ca taly st 2950G-2 4-E I- DC swi tch in a 23 -i nch rack , use

two of the Phillips truss-head screws to attach the 23-inch bracket to the
switch. See Figure 2-7, Figur e 2-8, and Figure 2-9.

• When mounting a switch in a 24-inch rack, use two of the Phillips truss-head

screws to attach the 19- or 24-inch bracket to the switch. See Figure 2-10,

Figure 2-11, and Figure 2-12.

Figure 2-1 to Figure 2-12 show how to attach a bracket to one side of the switch.

Follow the same steps to attach the second bracket to the opposite side of the
switch.

Figure 2-1 Attaching Brackets on the Switch in a 19-Inch Rack (Front Panel

Forward)

78-11157-02

Number-8

Phillips flat-head

screws

SYST RPS

STAT

UTIL

DUPLX

MODE

SPEED

1x 2x 3x

Catalyst 2950 Desktop Switch Hardware Installation Guide

4x 5x

45580

2-11

Installing the Switch in a Rack

Figure 2-2 Attaching Brackets on the Switch in a 19-Inch Rack (Rear Panel

Chapter 2 Installation

Forward)

CONSOLE

Number-8

Phillips flat-head

screws

52916

2-12

Figure 2-3 Attaching Brackets on the Switch in a 19-Inch Telco Rack

CONSOLE

Catalyst 2950 Desktop Switch Hardware Installation Guide

Number-8

Phillips flat-head

screws

45582

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Chapter 2 Installation

Installing the Switch in a Rack

Figure 2-4 Attachi ng Br ac kets on the Catalyst 2950G-48-EI Switc h in a 1 9-In c h

Rack (Front Panel Forward)

1

2

3

SYST
RPS
STAT
UTIL
DUPLX
SPEED

MODE

Number-8
Phillips
flat-head
screws

Figure 2-5 Attaching Brackets on the Catalyst 2950G-48-EI Switch in a 19-Inch Rack (Rear Panel

Forward)

4

5

1X

2X

6

7

8

9

10

11

12

13

14

15

16

15X

16X

65512

78-11157-02

CONSOLE

Number-8

Phillips

flat-head

screws

65513

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-13

Chapter 2 Installation

Installing the Switch in a Rack

Figure 2-6 Attaching Brackets on the Catalyst 2950G-48-EI Switch in a 19-Inch Telco Rack

CONSOLE

Number-8

Phillips

flat-head

screws

Figure 2-7 Attaching Brackets on the Catalyst 2950G-24-EI-DC Switch in a

23-Inch Telco Rack (Front Panel Forward)

65514

2-14

Number-8
Phillips
truss-head
screws

Catalyst 2950 Desktop Switch Hardware Installation Guide

SYST RPS

STAT

UTIL

DUPLX

MODE

SPEED

1

2

3

4

5

1X

2X

6

7

8

9

10

11

12

11X

12X

65673

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Chapter 2 Installation

Installing the Switch in a Rack

Figure 2-8 Attaching Brackets on the Catalyst 2950G-24-EI-DC Switch in a 23-Inch Telco Rack

(Rear Panel Forward)

CONSOLE

Number-8

Phillips

truss-head

screws

65674

Figure 2-9 Attaching Brackets on the Catalyst 2950G-24-EI-DC Switch in a 23-Inch Telco Rack

CONSOLE

Number-8

Phillips

truss-head

screws

Catalyst 2950 Desktop Switch Hardware Installation Guide

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65675

2-15

Installing the Switch in a Rack

Figure 2-10 Attaching Brackets on the Switch in a 24-Inch Rack (Front Panel

Figure 2-11 Attaching Brackets on the Switch in a 24-Inch Rack (Rear Panel

Forward)

Forward)

Number-8
Phillips
truss-head
screws

SYST RPS

STAT

UTIL

DUPLX

MODE

SPEED

Chapter 2 Installation

1

2

3

4

5

1X

2X

6

7

8

9

10

11

12

11X

12X

65666

2-16

CONSOLE

Catalyst 2950 Desktop Switch Hardware Installation Guide

Number-8

Phillips

truss-head

screws

65665

78-11157-02

Chapter 2 Installation

Figure 2-12 Attaching Brackets on the Switch in a 24-Inch Telco Rack

CONSOLE

Number-8

Phillips

truss-head

screws

Installing the Switch in a Rack

65667

Mounting the Switch in a Rack

After attaching the brackets, use the four Phillips machine screws to securely
attach the brackets to the rack. Figure 2-13 shows how to mount a switch in a rack.

T o pre ve nt the ca bles from obscur ing the sw itch and other de vice s in the ra ck, you
can also attach th e cabl e guide to the ra ck . See the “Attaching the Optional Cable

Guide” section for instructions.

Catalyst 2950 Desktop Switch Hardware Installation Guide

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2-17

Installing the Switch in a Rack

Figure 2-13 Mounting the Switch in a Rack

SYST

1x 2x 3x

RPS

STAT

UTIL

DUPLX

SPEED

MODE

4x 5x 6x

7x

8x

10Base-T / 100Base-TX

9x

10x

11x 12x

13x 14x

15x 16x

17x 18x

Chapter 2 Installation

21x 22x

23x 24x

Catalyst 2950

SERIES

19x

20x

Number-12

Phillips machine

screws

After mounting the switch in the rack, start the terminal-emulation software, and
provide power to the switch. See the “Powering On the Switch” section on

page 2-19 for instruct ions.

Attaching the Optional Cable Guide

W e recommend attaching the cable guide to prevent the cables from obscuring the
front panels of the switch and other de vices installed in the rack . Use the supplied
black Phillips machine screw to attach the cable guide to the left or right brack et,
as shown in Figur e 2-14.

45572

2-18

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 2 Installation

Installing the Switch on a Table, Shelf, or Desk

Figure 2-14 Attaching the Cable Guide

SYST

1x

RPS

2x

3x

STAT

UTIL

DUPLX

SPEED

MODE

4x

5x

6x

7x

8x

10Base-T / 100Base-TX

9x

10x

11x

12x

13x

14x

15x

16x

17x

18x

19x

Catalyst 2950

20x

21x

SERIES

22x

23x

24x

45573

Cable guide screw

Installing the Switch on a Table, She lf, or Desk

Before placing th e s wit ch on a tab l e, sh elf , o r de s k, lo ca te th e a d he sive strip with
rubber feet in the mounting-kit envelope, and attach four rubber feet to the
recessed areas on the switch bo ttom. Plac e the switc h on a table, she lf, or desk
near an AC power source or DC-input power source.

Start the terminal-emulation software and provide power to the switch. See the

“Powering On the Switch” section for instructions.

Powering On the Switch

Before connecting the AC power cord, a DC-input power source, or the RPS to
the switch, make sure that you ha ve st arted the ter minal-emulation so ftware (such
as ProComm, HyperTerminal, tip, or minicom) from your management station.

If you are using the AC power cord, c onnect the AC power cord to the AC power
connector and to an AC power outlet.

If you are using the DC-input power source, see the “Connecting to DC Power”
section for installation instructions.

Catalyst 2950 Desktop Switch Hardware Installation Guide

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2-19

Connecting to DC Power

Chapter 2 Installation

If you are using an RPS, re fer to the Cisco R PS 300 Re dun dant Power System
Ha rd w are I ns t a llati on G u i de for installation instructions.

Warning

Attach only the Cisco RPS 300 (model PWR300-AC-RPS-N1) to the RPS
receptacle.

For POST information, see the “Running POST” section on page 2-29 .

Connecting to DC Power

To connect the Ca talyst 295 0G-2 4-E I- DC sw itch to a DC -inp ut p ower sourc e,
follow these st eps:

• Preparing for installation

• Grounding the swit ch

• Wiring the DC-input power source

Warning

Warning

The customer 48 volt power system must provide reinforced insulation
between the primary AC power and the 48 VDC output.

The Catalyst 2950G-24-EI-DC switch is intended for Local Area Network
(LAN) connections only. This unit is not certified for use in Public Telephone
Networks.

2-20

Warning

Warning

Catalyst 2950 Desktop Switch Hardware Installation Guide

The Catalyst 2950G-24-EI-DC contains no field-replaceable units (FRUs). Do
not open the chassis or attempt to remove or replace any components. For
information about obtaining service for this unit, contact your reseller or
Cisco sales representative.

The equipment is to be connected to a UL Listed, limited power source.

78-11157-02

Chapter 2 Installation

Connecting to DC Power

Warning

Warning

Warning

Connect the equipment to a single, extra-low voltage (SELV) source.

The equipment is to be installed in a restricted access area.

Ethernet cables must be shielded when used in a central office environment.

Preparing for Installation

Locate the DC termina l block plug , the groun d lug, and th e two numbe r-10-32
screws in the DC-switch kit.

Obtain these necessary tools and equipment:

• Ratcheting torque screwdriver with a Phillips head that exerts up to

15 pound-force inche s (lbf-in .) of pres sure

• Panduit crimping tool with optional controlled cycle mechanism

(model CT-700, CT-720, CT-920, CT-920CH, CT-930, or CT-940CH)

• 6-gauge copper groun d wire (insula ted or noni nsul ated)

• Four leads of 12- or 14 -gauge co pp er w ire

• Wire-stripping tools for strip ping 6- , 12- , a nd 1 4-gauge wires

Grounding the Switch

Warning

Warning

78-11157-02

This equipment is intended to be grounded. Ensure that the host is
connected to earth ground during normal use.

When installing the unit, always make the ground connection first and
disconnect it last.

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-21

Connecting to DC Power

Step 1 Locate the ground lu g and the two numb er-10-32 screws.
Step 2 If your ground w ire is insul at ed, use a w ire str ipping t oo l to s tr ip th e 6-ga ug e

Chapter 2 Installation

T o ground the switch to earth ground, follow these steps. Make sure to follow any
grounding requirements at your site.

ground wire to 0.5 in ch ± 0 .02 inc h as shown in Figure 2-15.

Figure 2-15 Stripping the Ground Wire

0.50" ± 0.02"

Insulation

Wire lead

60528

Step 3 Slide the open end of the grou nd lug over the exposed ar ea of the 6- gauge w ire.
Step 4 Using a Panduit crimping tool , crimp the ground lug t o the 6-gaug e wire.

Figure 2-16 Crimping the Ground Lug

60529

Step 5 Use the two number-10-32 screws to attach the ground lug and wire assembly to

the switch rear panel.

2-22

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Chapter 2 Installation

Step 6 Using a ratcheting torque screwdriver, torque each ground-lug screw to 15 lbf-in.

(240 ounce-force inches [ozf-in.]).

Figure 2-17 Torquing Ground-Lug Screws

Connecting to DC Power

36 - 72V

1 - 0.5A

A
B

DC INPUT FOR REMOTE

POWER SUPPLY

SPECIFIED IN MANUAL.

+12V @4.5A

CONSOLE

Wiring the DC-Input Power Source

Warning

Only trained and qualified personnel should be allowed to install or replace
this equipment.

65295

Torque to 15 lbf-in.

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Catalyst 2950 Desktop Switch Hardware Installation Guide

2-23

Connecting to DC Power

Chapter 2 Installation

Warning

Before performing any of the following procedures, ensure that power is
removed from the DC circuit. To ensure that all power is OFF, locate the
circuit breaker on the panel board that services the DC circuit, switch the
circuit breaker to the OFF position, and tape the switch handle of the circuit
breaker in the OFF position.

Caution You must connect the Cataly st 2950G -2 4-EI- DC sw itch o nly to a DC- input

power source that has an input supply voltage fr om –36 to –72 VDC. If the
supply voltage is not in this range, the switch might not operate properly or
might be damaged .

Caution The switch must be installed with 5A-br anch-c ircuit pr otection.

Note This installation must comply with all applicable codes.

To wire the switch to a DC-input power source, follow these steps:

Step 1 Locate the termin al block pl ug (see Figure 2-18).

2-24

Figure 2-18 Terminal Block Plug

60530

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 2 Installation

Step 2 Identify the posi tive and negative feed po si tion s for the te rm inal bl ock

Connecting to DC Power

connection. The w iring seque nce is po sitive to positive and negative to negative
for both the A and the B feed wires. The switch rear panel identifies the positive
and negative positions for both the A and B feed wires.

Figure 2-19 Positive and Negative Positions on the Switch Rear Panel

36 - 72V

1 - 0.5A

A
B

65292

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Step 3

Using a 12- or 14-gauge wire-stripping tool, strip each of the four wires coming
from the DC-input power source to 0.27 inch ± 0.02 inch. Do not strip more than

0.29 inch of in sulati on from t he wir e. St rip ping mo re t han th e rec omm ende d
amount of wire ca n leave exposed wire f rom the te rm ina l bloc k plug a fte r
installation.

Figure 2-20 Stripping the DC-Input Power Source Wire

0.27" ± 0.02"

60531

Step 4 Insert the exposed wire of one of the four DC-input power source wires into the

terminal block plug. Make sure that you cannot see any wire lead. Only wire with
insulation should extend from the t erm i nal bl ock.

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-25

Connecting to DC Power

Chapter 2 Installation

Warning

An exposed wire lead from a DC-input power source can conduct harmful
levels of electricity. Be sure that no exposed portion of the DC-input power
source wire extends from the terminal block plug.

Figure 2-21 Inserting Wires in the Terminal Block Plug

Step 5

Return
Negative
Return
Negative

Use a ratcheting torque screwdriver to torque the terminal block captive screw

Feed A

Feed B

60532

(above the installed wire lead) to 4.5 lbf-in. (72 ozf-in.). (See Figure 2-22.)

Caution Do not overtorque the terminal-block captive screws. The recommended

maximum torque is 4.5 lbf-in.

2-26

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 2 Installation

Connecting to DC Power

Figure 2-22 Torquing the Terminal-Block Captive Screws

Torque to 4.5 lbf-in.

78-11157-02

60533

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-27

Connecting to DC Power

Step 6 Repeat Steps 4 an d 5 f or the r em ainin g th re e DC-i nput power sou rce wi res.

Chapter 2 Installation

Figure 2-23 shows the completed wiring of a termina l block plug .

Figure 2-23 Completed Wiring of Terminal Block Plug

Return
Negative
Return
Negative

Step 7 Insert the terminal block plug in the terminal block header on the switch rear panel

Feed A

Feed B

60534

(see Figure 2- 24).

Caution Secure the wires coming in from the terminal block so that they cannot be

disturbed by casual contact. For example, use tie wraps to secure the wires to
the rack.

2-28

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Chapter 2 Installation

Figure 2-24 Inserting the Terminal Block in the Block Header

Running POST

36 - 72V

1 - 0.5A

A
B

DC INPUT FOR REMOTE

POWER SUPPLY

SPECIFIED IN MANUAL.

+12V @4.5A

Tie wrap

Step 8 Remove the tape from the circuit-breaker switch handle, and move the

circuit-breaker handle to the on position.

Running POST

After the power is connected, the switch automatically begins POST, a series of
tests that verifies that the switch functions properly. When the switch begins
POST, the system LED is off. If POST completes successfully, the LED turns
green. If POST fails, the LED turns amber. See Chapter 3, “Troubleshooting,” to
determine a corrective action.

Note POST failures are usuall y fatal . Ca ll Ci sco Sy stem s imm edi ate ly if yo ur

switch does not pass POST.

CONSOLE

65293

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Catalyst 2950 Desktop Switch Hardware Installation Guide

2-29

Connecting to 10/100 an d 10/100/1000 Ports

Connecting to 10/100 and 10/100/1000 Ports

The 10/100 and 10/100 /1000 port s configure t hemsel ves to operate at the spee d
and duplex settings of attached devices. If the attached devices do not support
autonegotiation, you c an expl ic itly se t t he spe ed an d d uplex p ar amete rs.

The 10/100 ports operat e at 10 or 100 Mbps in half - or full- duplex mode.
The 10/100/1000 ports on Catalyst 2950T-24 switches operate at 10 or 100 Mbps

in half- or full -dupl ex m ode an d at 1 000 Mbps in full -d uplex m ode.
Connecting devices that do not autonegotiate or devices with manually set speed

and duplex parameters c an re duce p er forma nc e or re sult in l ink fail ures be twe en
the devices. To maximize performance, choose one of these methods for
configuring the ports:

• Let the ports autonegotiate both spe ed and dupl ex.

• Set the speed and d upl ex par amete rs on bot h e nds of t he c on nection .

Follow these steps to connect the switch to 10BASE-T, 100BASE-TX, or
1000BASE-T devices:

Chapter 2 Installation

2-30

Caution To prevent electrostatic-discharge (ESD) damage, follow your normal board

and component hand ling pro cedure s.

Step 1 When connecting t o se rvers, wo rksta tions, a nd ro ut ers, inse rt a twist ed-p air

straight-through cable in a front-panel RJ-45 connector, as shown in Figure 2-25,

Figure 2-26, and Figure 2-27. When connecting to switches or repeaters, insert a

twisted-pair crossov er cable. (See the “Cable and Adapter Specif ications” section

on page B-6 for cable-pinout descriptions.)

Note When connecting to 1000BASE-T-compatible devices, be sure to use a four

twisted-pair, Category 5 cable.

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 2 Installation

Connecting to 10/100 and 10/100/1000 Ports

Figure 2-25 Connecting to a Port on Catalyst 2950-12, 2950-24, 2950C-24, and

2950T-24 Switches

SYST RPS

STAT

UTIL

DUPLX

MODE

SPEED

1x

2x

3x

4x

5x

45576

Figure 2-26 Connecting to a Port on Catalyst 2950G-12-EI, 2950G-24-EI, and

2950G-24-EI-DC Switches

1

2

3

4

SYST RPS

STAT

UTIL

DUPLX

SPEED

MODE

1X

2X

5

6

7

8

9

10

11

12

11X

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12X

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Catalyst 2950 Desktop Switch Hardware Installation Guide

2-31

Connecting to 10/100 an d 10/100/1000 Ports

Figure 2-27 Connecting to a Port on Catalyst 2950G-48-EI Switches

SYST
RPS
STAT
UTIL
DUPLX
SPEED

MODE

Step 2 Insert the other cable end in an RJ-45 connector on the target device.
Step 3 Observe the port status LED.

Chapter 2 Installation

1

2

3

4

5

1X

2X

6

7

8

9

10

11

12

13

14

15

16

15X

16X

2-32

The LED turns green when the switch and the target device have an established
link.

The LED turns amber while Spanning Tree Protocol (STP) discovers the network
topology and searches for loops. This proce ss takes about 30 sec onds, and the n
the LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable
problem, or there might be a p rob lem w ith t he ad ap ter in sta lled in t he target
device. See Chapter 3, “Troubleshooti ng,” for solutions to cabling pr oblems.

Step 4 Reconfigure and reb oot the t arget device if necessa ry.
Step 5 Repeat Steps 1 through 4 to con nect each port.

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 2 Installation

Connecting to 100BASE-FX Ports

The 100BASE-FX ports only operate at 10 0 Mbps and ful l-duplex mode.
You can connect a 100BASE-FX port to an SC or ST port on a compatible device

by using one of the MT-RJ fiber-optic patch cables listed in Table 2-1. Use the
Cisco part numbers i n Table 2-1 to ord er t he p atc h cabl e s tha t y ou ne ed .

Follow these steps to connect the switch to a 100BASE-FX dev ice:

Caution Do not remove the rubber plugs from the fiber-optic ports or the ru bber ca ps

from the fiber-optic cable until you are ready to connect the cable. The plugs
and caps protec t t he fiber-optic p or ts a nd cabl es from c on tam inat ion a nd
ambient light.

Step 1 Remove the rubber plugs from the 100BASE-FX ports an d the rubbe r caps fr om

the MT-RJ patch cable. Store them for future use.

Step 2 Insert the cable in a 100BASE-FX port. (See Fi gure 2-28.)

Connecting to 100BASE-FX Ports

Figure 2-28 Connecting to a 100BASE-FX Port

SYST

1x

RPS

2x

3x

STAT

UTIL

DUPLX

SPEED

MODE

4x

5x

6x

7x

8x

10Base-T / 100Base-TX

9x

10x

11x

12x

13x

14x

15x

16x

17x

18x

19x

20x

21x

MT-RJ

patch cable

Catalyst 2950 Desktop Switch Hardware Installation Guide

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22x

Catalyst 2950

23x

24x

Rubber

plug

100Base-FX

SERIES

2625

45571

2-33

Connecting to GBIC Module Port s

Step 3 Insert the other cable end in an SC or ST port on the target device.
Step 4 Observe the port status LED.

The LED turns green when the switch and the target device have an established
link.

The LED turns amber while STP discovers the network topology and searches for
loops. This process takes abou t 30 seconds, and then the port LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable
problem, or there might be a p rob lem w ith t he ad ap ter in sta lled in t he target
device. See Chapter 3, “Troubleshooti ng,” for solutions to cabling pr oblems.

Step 5 Reconfigure and reb oot the t arget device if necessa ry.
Step 6 Repeat Steps 1 through 5 to con nect each port.

Connecting to GBIC Module Ports

Chapter 2 Installation

To connect the G BIC m odule p orts to a tt ache d devices, f ollow the se step s. For
detailed instruct ions abo ut in stal ling, r emoving, a nd cab lin g a GB IC
(a 1000BASE-X module or a GigaStack modul e), refe r to your GBI C
documentation.

Connecting to 1000BASE-X GBIC Module Ports

Caution Do not remove the rubber plugs from the GBIC module port or the rubber caps

from the fiber-optic cable until you are ready to connect the cable. The plugs
and caps protect the G BIC mod ule ports and cables fr om conta minat ion and
ambient light.

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-34

78-11157-02

Chapter 2 Installation

After installing the 1000BASE-X GBIC in the GBIC module slot, follow these
steps:

Step 1 Remove the rubber plugs from the GBIC module port , and store the m for futur e

use.

Step 2 Insert the SC connector in the fiber-optic receptacle (see Figure 2-29).

Figure 2-29 Connecting to a 1000BASE-X Port

Connecting to GBIC Module Ports

1

Catalyst 2950

2

SERIES

Step 3 Insert the other cable end in a fiber-optic receptacle on a target device.
Step 4 Observe the port status LED.

The LED turns green when the switch and the target device have an established
link.

The LED turns amber while STP discovers the network topology and searches for
loops. This process takes abou t 30 seconds, and then the port LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable
problem, or a there mi ght be prob lem wi th the ad apter inst alled in the target
device. See Chapter 3, “Troubleshooti ng,” for solutions to cabling pr oblems.

Step 5 Reconfigure and reb oot the switch or target device if nece ssary.

65296

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Catalyst 2950 Desktop Switch Hardware Installation Guide

2-35

Connecting to GBIC Module Port s

Connecting to GigaStack GBIC Module Ports

After installing the GigaStac k GBIC in th e GBIC mo dule slot, f o llow these steps:

Step 1 Insert the GigaStack cable connector in the GBIC (see Figure 2-30).

Figure 2-30 Connecting to a GigaStack Port

Chapter 2 Installation

Catalyst 2950

2

SERIES

Step 2

1

Insert the other cable end in a port on a target device.

Step 3 Observe the port status LED.

The LED turns green when the switch and the target device have an established
link.

The LED turns amber while STP discovers the network topology and searches for
loops. This process takes abou t 30 seconds, and then the port LED turns green.

If the LED is off, the target device might not be turned on, there might be a cable
problem, or there might be a problem with the adapter installed in the target
device. See Chapter 3, “Troubleshooti ng,” for solutions to cabling pr oblems.

Step 4 Reconfigure and reboot t he switch or target device if nece ssary.

65298

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Chapter 2 Installation

Connecting a PC or a Terminal to the Console Port

Connecting a PC or a Terminal to the Console Port

If you want to connect a PC to the consol e port, use the supplie d rollover cable
and RJ-45-to-DB-9 adapter. If you want to connect a terminal to the console port,
you need to provi de an RJ- 45 - to -DB - 25 female DTE adapter. Y o u can or d er a kit
(part number ACS-DSBUASYN=) with that adapter from Cisco. For console-port
and adapter-pinout in for mat ion, se e t he “Cable and Adapter Specifications”

section on page B-6.

The PC or terminal must support VT100 terminal emulation. The
terminal-emulation software—frequently a PC application such as
HyperTerminal or Procomm Plus—makes communication between the switch and
your PC or terminal possible duri ng the setup pro gram.

Follow these steps to connect your PC or terminal to the console port:

Step 1 Make sure that your terminal-emulation software is configured to communicate

with the switch through hardware flow control.

Step 2 Configure the b aud r ate a nd char acter form at of t he PC or t ermin al to matc h th ese

console-port default characteristics:

78-11157-02

• 9600 baud

• Eight data bits

• One stop bit

• No parity

After gaining access to the switch, you can change the port baud rate. Refer to the
Catalyst 2950 Desktop Sw itch S oft ware Configuration Gui de f or instruc ti ons.

Step 3 Insert the rollo ver ca ble in the co nsole port, as show n in Figure 2-31, Figure 2-32,

and Figure 2-33. (See the “Identifying a Rollo ver Cable” section on page B-9 for
a pinout description.)

Catalyst 2950 Desktop Switch Hardware Installation Guide

2-37

Connecting a PC or a Terminal to the Console Port

Figure 2-31 Connecting to the Console Port

Chapter 2 Installation

RATING

100-127V~

@ 1A

200-240V~

@0.5A

50-60Hz

DC INPUT FOR REMOTE

POWER SUPPLY

SPECIFIED IN MANUAL.

+12V @4.5A

CONSOLE

45586

Rollover cable

Figure 2-32 Connecting to a Console Port Only on Catalyst 2950G-24-EI-DC Switches

36 - 72V

1 - 0.5A

A
B

DC INPUT FOR REMOTE

POWER SUPPLY

SPECIFIED IN MANUAL.

+12V @4.5A

CONSOLE

65519

Rollover cable

2-38

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 2 Installation

Figure 2-33 Connecting to a Console Port Only on Catalyst 2950G-48-EI Switches

Where to Go Next

RATING

100-127V~

@ 1A

200-240V~

@0.5A

50-60Hz

DC INPUT FOR REMOTE

POWER SUPPLY

SPECIFIED IN MANUAL.

+12V @4.5A

Rollover cable

Step 4 Attach the DB-9 adapter to a PC, or attach an appropriate adapter to the terminal.
Step 5 Insert the other cable end in the attached adapter.
Step 6 Boot the terminal-emulation software.

Where to Go Next

For information about starting up the switch, refer to the Release Notes for the
Catalyst 2950 Switch .

For information about configuring the switch, refer to th e Catalyst 2950 Desktop
Switch Software Configuration Guide.

65518

CONSOLE

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Catalyst 2950 Desktop Switch Hardware Installation Guide

2-39

Where to Go Next

Chapter 2 Installation

2-40

Catalyst 2950 Desktop Switch Hardware Installation Guide

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CHAPTER

3

Troubleshooting

The front-panel LE Ds provide tr oublesho oting in format ion abou t the switch .
They show power-on self-test (POST ) fail ure s, po rt-c on nect ivity prob l ems , an d
overall switch performance . For a full de scripti on of the LED s, see the “LEDs”

section on page 1-9.

You ca n also get sta tistic s f rom t he Cl uste r Ma nage ment Su ite (CMS ), t he
command-line interface (CLI), or a Simple Network Management Protocol
(SNMP) workstation. Refer to the Catalyst 2950 D eskt o p Swi tch Softw are
Configuration Guide, the Catalyst 2950 D esktop Swit ch Command Reference, or
the documentation t hat ca me w it h your SN MP app lic ation f or det ails .

This chapter p rovides the se topi cs f or trou bl eshoot ing pr oble ms:

• Understanding POST resu lts

• Diagnosing problems

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Catalyst 2950 Desktop Switch Hardware Installation Guide

3-1

Understanding POST Results

Understanding POST Results

While the switch powers on, it automatically begins POST, a series of tests that
verifies that th e s wi tc h fu ncti on s p rop er ly. When th e sw itc h begin s PO ST, the
system LED is off . If POST completes su ccessfully, the LED turns green. If POST
fails, the LED turns amber.

Note POST failures are usually fatal. Call Cisco Systems if your switch doe s not

pass POST.

Diagnosing Problems

Common switch problems fall into these categories:

• Poor performance

• No connectivity

Chapter3 Troubleshooting

3-2

• Corrupted software

Table 3-1 describes how to detect and solve these pro blem s.

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Chapter 3 Troubleshooting

Table 3-1 Common Problems and Solutions

Symptom Possible Cause Resolution

Poor performance or
excessive errors.

Duplex autonegotiation mismatch. Refer to the Catalyst 29 50

Desktop Switch Software
Configuration Guide for

information about ide ntifying
autonegotiation mi smat ch es.

Cabling distance exceeded.

• Port statistics show excessive

frame check sequence (FCS),
late-collision, or alignment
errors.

• Refer to the Catalyst 2950

Desktop Switch Software
Configuration Guide for

information about
displaying port stat istic s.

• For 10BASE-T, 100BASE-TX,

and 1000BASE-T connections:

–

The distance between the
port and the attach ed de vice
exceeds 328 feet
(100 meters).

–

If the switch is attach ed to a
repeater, the total distance
between the two end

• Reduce cable length to

within the recommended
distances.

• Refer to your r epea ter

documentation for cabling

guidelines.
stations exceeds the cabli ng
guidelines.

• For GBIC port connecti ons: The

distance between th e GB I C po rt
and the attached device exceeds

• Refer to your G BIC

documentation for cabling

guidelines.

the GBIC cabling guidelines.

Bad adapter in attached device.

Diagnosi ng Problems

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• Excessive errors found in po rt

statis ti c s .

Spanning Tree Protocol (STP)
checking for possible loops.

Catalyst 2950 Desktop Switch Hardware Installation Guide

• Run adapter ca rd diagnosti c

utility.

Wait 30 seconds for po r t st atus
LED to turn green.

3-3

Diagnosing Problems

Table 3-1 Common Problems and Solutions (continued)

Symptom Possible Cause Resolution

No connectivity. Incorrect or bad cable.

No link at both ends.

Unreadable characters on
the management console.

System LED is amber, and
all port LEDs are off.

System LED is amber

• A crossover cable was used

when a straight-through was
required, or vice-versa.

• The cable is wired incorrectly. • Replace it with a tested

• STP checking for possible

loops.

Switch not recognizing a GBIC
module.

Incorrect baud rate. Reset the terminal-emulation

Corrupted software. Attach a monitor to the serial

• Internal fan fault detected. • Check if the fan has failed

• Nonfatal or fatal POST error

detected.

• For the correct p inouts a nd

the proper applic ation of

cross ove r vs.

straight-through cables, see

the “Cable and Adapter

Specifications” section on

page B-6.

good cable.

• Wait 30 seconds for port

status LED to turn green.

Refer to your G BIC
documentation fo r mor e
information.

software to 9600 baud.

port to display the switch boot
loader. For more information,
refer to the Catalyst 2950

Desktop Switch Software
Configuration Guide.

by using the show env fan

privileged EXEC command.

If the fan has failed, call

Cisco Systems.

• Use the show post

privile g ed EX EC co mmand

to see which POST test

failed.

Chapter3 Troubleshooting

3-4

Catalyst 2950 Desktop Switch Hardware Installation Guide

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APPENDIX

A

Technical Specifications

Table A-1, Table A-2, Table A-3, and Table A-4 list the technical specifications

for the Catalyst 2950 sw it ches. Table A-5 and Table A-6 list the regulatory
agency approvals.

Table A-1 Technical Specifications for Catalyst 2950-12, 2950-24, 2950C-24,

and 2950T-24 Switches

Environmental Ranges

Operating temp er atur e 32 to 113°F (0 to 45°C)
Storage temperature –13 to 158°F (–25 to 70°C)
Operating humidity 10 to 8 5% (non co nde nsing )
Operating altitu de Up to 10,000 ft (3 000 m )
Storage altitude Up to 15,000 ft (4570 m)

Power Requirements

AC input voltage 100 to 127/200 to 240 VAC

(autoranging) 50 to 60 Hz
DC input voltages +12V @4. 5A
Power consumption 30W (maximum)

102 Btus per hour

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Catalyst 2950 Desktop Switch Hardware Installation Guide

A-1

Appendix A Technical Specificatio ns

Table A-1 Technical Specifications for Catalyst 2950-12, 2950-24, 2950C-24,

and 2950T-24 Switches (continued)

Physical Dimensions

Weight 6.5 lb (3 kg)
Dimensions

(H x W x D)

Table A-2 Technical Specifications for Catalyst 2950G-12-EI, 2950G-24-EI, and

2950G-48-EI Switches

1.72 x 17.5 x 9.52 i n.

(4.36 x 44.45 x 24.18 cm)

Catalyst 2950G-12-EI and
2950G-24-EI Switches

Environmental Ranges

Operating
temperatu re

Storage
temperatu re

Operating
humidity

Operating

32 to 113°F
(0 to 45°C)

–13 to 158°F
(–25 to 70°C)

10 to 85%
(noncondensing)

Up to 10,000 ft (3000 m) U p to 10,000 ft (30 00 m)

altitude
Storage

Up to 15,000 ft (4570 m) U p to 15,000 ft (45 70 m)

altitude

Power Requirements

AC input
voltage

100 to 127/200
to 240 V AC (autoranging)
50 to 60 Hz

DC input

+12V @4.5A +12V @4.5A

voltage
Power

consumption

30W (maximum)
102 Btus per hour

Catalyst 2950G-48-EI
Switch

32 to 113°F
(0 to 45°C)

–13 to 158°F
(–25 to 70°C)

10 to 85%
(noncondensing)

100 to 127/200
to 240 VAC (autoranging)
50 to 60 Hz

45W (maximum)
154 Btus per hour

A-2

Catalyst 2950 Desktop Switch Hardware Installation Guide

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Appendix A Technical Specifications

Table A-2 Technical Specifications for Catalyst 2950G-12-EI, 2950G-24-EI, and

2950G-48-EI Switches (continued)

Catalyst 2950G-12-EI and
2950G-24-EI Switches

Catalyst 2950G-48-EI
Switch

Physical Dimensions

Weight 6.5 lb (3 kg) 10.5 lb (4.8 kg)
Dimensions

(H x W x D)

Table A-3 Technical Specifications for Catalyst 2950G-24-EI-DC Switch

1.72 x 17.5 x 9.52 in.
(4.36 x 44.45 x 24.18 cm)

1.72 x 17.5 x 13 in.
(4.36 x 44.45 x 33.02 cm)

Environmental Ranges

Operating temperature 32 to 113°F (0 to 45°C)
Storage temperature –13 to 158°F (–25 to 70°C)
Operating hu midit y 10 to 85% (nonco ndensin g)
Operating altitude Up to 10,000 ft (3000 m)
Storage altitude Up to 15,000 ft (4570 m)

Power Requirements

Power consumption 100W
DC input voltage –36 to –72 VDC

1

Wire gauge for power connection 12 or 14 AW G

(6 AWG for

protective earth)

Branch circuit protection 5A

Physical Dimensions

Weight 6.5 lb (3 kg)
Dimensions

(H x W x D)

1. AWG = American Wire Gauge

1.72 x 17.5 x 9.52 i n.
(4.36 x 44.45 x 24.18 cm)

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Catalyst 2950 Desktop Switch Hardware Installation Guide

A-3

Appendix A Technical Specificatio ns

Table A-4 Fiber-Port Specifications for Catalyst 2950C-24 Switches

Fibe r-Po r t Po w e r Level s

Optical transmitter

1300 nm

wavelength
Optical receiver

–14 dBm

sensibility
Optical transmitter

–19 to –14 dBm

power
Transmit –19 to –14 dBm

1. nm = nan om ete rs

2. dBm = decibel milliwatt

Table A-5 Catalyst 2950 Switch Agency Approvals

Safety EMC

UL 1950/CSA 22.2 No. 950 FCC Part 15 Class A
IEC 60950/EN 6095 0 EN 5 502 2: 1 998 (C ISPR22) Cla ss A
AS/NZS 3260, T S001 EN 55024: 1998 (C ISPR24 )
CE VCCI Class A

AS/NZS 3548 Class A
CE
CNS 13438 Class A
MIC

1

2

A-4

Table A-6 Catalyst 2950G-24-EI-DC Switch Agency Approvals

NEBS

Bellcore GR-1089-CORE
Bellcore GR-63-CORE
Bellcore SR-3580 Level 3

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Connectors and Cables

This appendix d escribe s the conne ct ors, c a bles, a nd ada pte rs that you use to
connect the switch to other devices.

Connector Specifications

These sections describe the connectors used with the Catalyst 2950 switches.

10/100 Ports

The 10/100 Ethernet por ts use stand ard RJ-45 con nector s and Ether net pinout s
with internal cross o vers , as s ho wn b y an X in the port name. T hese ports ha v e the
transmit (TD) and receive (RD) signals internally crossed so that a twisted-pair
straight-through cable and adapter can be attached to the port. Figure B-1 shows
the pinout.

When connecting 10/100 ports to compatible devices, such as servers,
workstations, and routers, you can use a two or four twisted-pair, straight-through
cable wired for 1 0BASE-T a nd 10 0BASE-TX. Figure B-6 shows the two
twisted-pair, straight-through cable schematics. Figure B-8 shows the four
twisted-pair, straight-through cable schematics.

APPENDIX

B

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When connecting the ports to other devices, such as switches or repeaters, you can
use a two or four tw is ted-pa ir, crossover cable. Figur e B-7 shows the two
twisted-pair , c rossover cable schematics. Figure B-9 shows the four twisted-pair,
crossover cable schematics.

Catalyst 2950 Desktop Switch Hardware Installation Guide

B-1

Connector Specifications

Note Use a straight-throu gh cable to connec t two ports only when one por t is

Appendix B Connectors and Cables

You can use Category 3, 4, or 5 cabl ing whe n conne cting to
10BASE-T-co mpa tib le devices. You must use Category 5 cabli ng whe n
connecting to 10 0BASE-TX-co mpati ble devices.

designated with an X. Use a crossover cable to connect two ports when bot h
ports are designated with an X or when both ports do not have an X.

Figure B-1 10/100 RJ-45 Pinouts

231 45678Pin Label

100BASE-FX Ports

The 100BASE-FX ports use M T-RJ connectors, shown in Figure B-2. The
100BASE-FX ports use 50/125- or 62.5/125-micron multimode fiber-optic
cabling.

You can co nnect a 10 0BASE-FX port to an SC or ST port on a ta rget device by
using one of the MT-RJ fiber -optic patch cables listed in Table B-1. Use the Cisco
part numbers in Table B-1 to order the pat ch cables that you need.

1
2
3
4
5
6
7
8

RD+
RD­TD+
NC
NC
TD­NC
NC

H5318

B-2

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Appendix B Connectors and Cables

Figure B-2 MT-RJ Connector

Table B-1 MT-RJ Patch Cables for 100BASE-FX Connections

Ty pe Cisco Part Number

1-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-1M
3-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-3M
5-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-5M
1-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-1M
3-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-3M
5-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-5M

Connector Specifications

28845

10/100/1000 Ports

The 10/100/1000 Ethe rnet por ts on Catalyst 2950T-24 switches use standard
RJ-45 connectors. Figure B-3 sh ows the pinou t.

Connecting to 10BASE-T- and 100BASE-TX-Compatible Devices

When connecting the ports to 10BASE-T - and 100BASE-TX-compatible devices,
such as servers, workstations, and routers, you can use a two or four twisted-pair,
straight-through cable wired for 10BASE-T and100BASE-TX. Figure B-6 shows
the two twisted-pair, straight-through cable schematics. Figure B-8 shows the
four twisted-pair, straight-through cable schematics.

When connecting the ports to 10BASE-T - and 100BASE-TX-compatible devices,
such as switches o r repe ate rs, y ou ca n use a t wo or f our twi sted- pa ir, crossover
cable. Figure B-7 shows the two twisted-pair, crossover cable schematics.

Figure B-9 shows the four twisted-pair, crossover cable schematics.

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B-3

Connector Specifications

You can use Category 3, 4, or 5 cabl ing whe n conne cting to
10BASE-T-co mpa tib le devices. You must use Category 5 cabli ng whe n
connecting to 10 0BASE-TX-co mpati ble devices.

Connecting to 1000BASE-T-Compatible Devices

When connecting the ports to 1000BASE-T-compatible devices, such as servers,
workstations, and routers, you must use a fou r twisted-pa ir, Category 5,
straight-through cable wi red for 1 0BASE-T, 100BASE-TX, and 1000BASE-T.

Figure B-10 shows the straight -thr ough ca ble sche mat ics.

When connecting the port s to other devices, such a s switches or repe aters, you
must use a four twisted-pair, Category 5, crossover cable. Figure B -11 shows the
crossover cable schematics.

Note Be sure to use a f our tw ist ed-pa ir, Category 5 c abl e w hen co nne ctin g t o a

1000BASE-T-c ompa tible device.

Appendix B Connectors and Cables

B-4

Note Use a straight-throu gh cable to connec t two ports only when one por t is

designated with an X. Use a crossover cable to connect two ports when bot h
ports are designated with an X or when both ports do not have an X.

Figure B-3 RJ-45 Pinouts for 10/100/1000 Ports

Pin Label

1
2
3
4
5
6
7
8

Catalyst 2950 Desktop Switch Hardware Installation Guide

TP0+
TP0­TP1+
TP2+
TP2­TP1­TP3+
TP3-

1 2 3 4 5 6 7 8

34751

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Appendix B Connectors and Cables

1000BASE-X GBIC Module Ports

1000BASE-X Gigabit Interface Converter (GBIC) module ports use duplex SC
connectors, as shown in Figure B-4.

Figure B-4 1000BASE-X SC Connector

Tx Rx

GigaStack GBIC Module Ports

The GigaStack GBIC modul e ports use prop rieta ry connec tors , as shown in

Figure B-5. The GigaStack GB IC cable s are pro prietar y, high-data-rate cable s

with enhanced signal integrity and EMI protection.

Connector Specifications

60535

Caution Do not use standard IEEE 1394 cables with the GigaStack GBIC.

Console Port

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Figure B-5 GigaStack Connector

60536

The console port uses an 8-pin RJ-45 connector. You can connect a switch to a PC
through the console port and the supplied RJ-45-to-RJ-45 rollover cable and
RJ-45-to-DB-9 adapter . If you want to connect a switch to a term inal, you need to

Catalyst 2950 Desktop Switch Hardware Installation Guide

B-5

Cable and Adapter Specifications

provide an RJ-45-to-DB-25 female DTE adapter. You can order a kit (part number
ACS-DSBUASYN=) with that adapter fr om Ci sco. For c onso le- por t a nd
adapter-pinout information, see Table B-2 and Table B-3.

Cable and Adapter Specifications

These sections describe the cables and adapters used with Catalyst 2950 switches.

Two Twisted-Pair Cable Pinouts

Figure B-6 and Figure B-7 show the schematics of two twisted-pair cables for

10/100 ports.

Figure B-6 Two Twisted-Pair Straight-Through Cable Schematic for

10/100 Ports

Appendix B Connectors and Cables

B-6

Switch

3 TD+

6 TD–

1 RD+

2 RD–

Figure B-7 Two Twisted-Pair Crossover Cable Schematic for 10/100 Ports

Switch

3 TD+

6 TD–

1 RD+

2 RD–

Catalyst 2950 Desktop Switch Hardware Installation Guide

Switch
3 RD+

6 RD–
1 TD+

2 TD–

Switch
3 TD+

6 TD–
1 RD+

2 RD–

H5578

H5579

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Appendix B Connectors and Cables

Cable and Adapter Specifications

Four Twisted-Pair Cable Pinouts for 10/100 Ports

Figure B-8 and Figure B-9 show the schematics of four twisted-pair cables for

10/100 ports.

Figure B-8 Four Twisted-Pair Straight-Through Cable Schematic for

10/100 Ports

Switch Switch

1 RD+
2 RD­3 TD+
6 TD-

4NC
5NC
7NC
8NC

Figure B-9 Four Twisted-Pair Crossover Cable Schematic for 10/100 Ports

Switch Switch

1 RD+
2 RD­3 TD+
6 TD-

4NC
5NC
7NC
8NC

1 TD+
2 TD­3 RD+
6 RD-

4NC
5NC
7NC
8NC

1 RD+
2 RD­3 TD+
6 TD-

4NC
5NC
7NC
8NC

65271

65273

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B-7

Appendix B Connectors and Cables

Cable and Adapter Specifications

Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports

Figure B-10 and Figure B-11 show the schematics of four twisted-pair cables for

10/100/1000 ports on Ca taly st 29 50T-24 switches.

Figure B-10 Four Twisted-Pair Straight-Through Cable Schematic for

10/100/1000 Ports

Switch Switch

1 TPO+
2 TPO­3 TP1+
6 TP1-

4 TP2+
5 TP2­7 TP3+
8 TP3-

Figure B-11 Four Twisted-Pair Crossover Cable Schematics for 10/100/1000

Ports

Switch Switch

1 TPO+
2 TPO­3 TP1+
6 TP1-

4 TP2+
5 TP2­7 TP3+
8 TP3-

1 TP1+
2 TP1­3 TPO+
6 TPO-

4 TP3+
5 TP3­7 TP2+
8 TP2-

1 TP0+
2 TP0­3 TP1+
6 TP1-

4 TP2+
5 TP2­7 TP3+
8 TP3-

65272

65274

B-8

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