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Contents

vCatalyst 3750 Metro Switch Hardware Installation Guide

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Verify Switch Connections 4-2Bad or Damaged Cable 4-2Ethernet and Fiber Cables 4-3Link Status 4-3Transceiver Module Port Issues 4-3Port and Interface Settings 4-3Ping the End Device 4-4Spanning Tree Loops 4-4

Monitor Switch Performance 4-4Speed, Duplex, and Autonegotiation 4-4Autonegotiation and NIC Cards 4-5Cabling Distance 4-5

Clearing the Switch IP Address and Configuration4-5

Finding the Switch Serial Number 4-6

Technical Specifications A-1

Connector and Cable Specifications B-1

Connector Specifications B-110/100 Ports B-1

Connecting to 10BASE-T- and 100BASE-TX-Compatible DevicesB-2100BASE-FX Ports B-2

Connecting to 1000BASE-T DevicesB-3

SFP Module Ports B-4Console Port B-4

Cable and Adapter Specifications B-5SFP Module Cable Specifications B-5Two Twisted-Pair Cable Pinouts B-6Four Twisted-Pair Cable Pinouts for 10/100 PortsB-7Identifying a Crossover Cable B-8Four Twisted-Pair Cable Pinouts for 1000BASE-T PortsB-8Adapter Pinouts B-9

Configuring the Switch with the CLI-Based Setup Program C-1Taking Out What You Need C-2

Connecting to the Console Port C-3

Starting the Terminal-Emulation Software C-3

Connecting to a Power Source C-4


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Entering the Initial Configuration InformationC-4IP Settings C-4Completing the Setup Program C-5

Connecting to an Ethernet Port C-7

I N D E X


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Preface

AudienceThis guide is for the networking or computer technician responsible for installing the Catalyst 3750Metro switch. We assume that you are familiar with the concepts and terminology of Ethernet and local

area networking. If you are interested in more training and education in these areas, learningopportunities including training courses, self-study options, seminars, and career certifications programsare available on the Cisco Training & Events web page:

http://www.cisco.com/web/learning/index.html

PurposeThis guide documents the hardware features of the Catalyst 3750 Metro switch. It describes the physicaland performance characteristics of the switch, explains how to install it, and provides troubleshootinginformation.

This guide does not describe system messages that you might receive or how to configure your switch.For more information, see the switch software configuration guide, the switch command reference, andthe switch system message guide on the Cisco.com Product Documentation home page. For informationabout the standard Cisco IOS Release 12.1 or 12.2 commands, see the Cisco IOS documentation set fromthe Cisco.com home page by choosing Support > Documentation > Product and SupportDocumentation/Cisco IOS Software .

OrganizationThis guide is organized into these chapters:

Chapter 1, Product Overview, is a physical and functional overview of the switch. This chapter

describes the switch ports, the standards they support, and the switch LEDs.Chapter 2, Switch Installation, includes procedures on how to power on the switch; how to install theswitch in a rack, on a wall, on a table, or shelf; and how to make port connections.

Chapter 3, Connecting the Power Supply, describes how to connect the AC and DC power supply unitsand how to remove the units.

Chapter 4, Troubleshooting, describes how to identify and resolve some of the problems that mightarise when you install the switch and how to identify the serial number when it is necessary to calltechnical support for help.


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PrefaceConventions

Appendix A, Technical Specifications, lists the physical and environmental specifications for theswitch and the regulatory agency approvals.

Appendix B, Connector and Cable Specifications, describes the connectors, cables, and adapters thatyou use to connect to the switch.

Appendix C, Configuring the Switch with the CLI-Based Setup Program, provides a quickstep-by-step installation and setup procedure for a switch.

ConventionsThis document uses these conventions and symbols for notes, cautions, and warnings:

Note Means reader take note . Notes contain helpful suggestions or references to materials not contained inthis manual.

Caution Means reader be careful . In this situation, you might do something that could result in equipmentdamage or loss of data.

The safety warnings for this product are translated into several languages in the Regulatory Complianceand Safety Information for the Catalyst 3750 Metro Switch that ships with the product. The EMCregulatory statements are also included in that guide.

Warning IMPORTANT SAFETY INSTRUCTIONS

This warning symbol means danger. You are in a situation that could cause bodily injury. Before youwork on any equipment, be aware of the hazards involved with electrical circuitry and be familiarwith standard practices for preventing accidents. Use the statement number provided at the end ofeach warning to locate its translation in the translated safety warnings that accompanied thisdevice. Statement 1071

SAVE THESE INSTRUCTIONS


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PrefaceRelated Publications

Related PublicationsThese documents provide complete information about the switch and are available from thisCisco.com site:

http://www.cisco.com/en/US/products/hw/switches/ps5532/tsd_products_support_series_home.html

Note Before installing, configuring, or upgrading the switch, see the release notes on Cisco.com for the latestinformation.

Release Notes for the Catalyst 3750 Metro Switch

Catalyst 3750 Metro Switch Getting Started Guide

Regulatory Compliance and Safety Information for the Catalys t 3750 Metro Switch

Catalyst 3750 Metro Switch Software Configuration Guide

Catalyst 3750 Metro Switch Command Reference

Catalyst 3750 Metro Switch System Message Guide Catalyst 3750 Metro Switch Hardware Installation Guide

These compatibility matrix documents are available from this Cisco.com site:

http://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html

Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix

Cisco 100-Megabit Ethernet SFP Modules Compatibility Matrix

Cisco CWDM SFP Transceiver Compatibility Matrix

Cisco Small Form-Factor Pluggable Modules Compatibility Matrix

Compatibility Matrix for 1000BASE-T Small Form-Factor Pluggable Modules

Obtaining Documentation and Submitting a Service RequestFor information on obtaining documentation, submitting a service request, and gathering additionalinformation, see the monthly Whats New in Cisco Product Documentation , which also lists all new andrevised Cisco technical documentation, at:

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

Subscribe to the Whats New in Cisco Product Documentation as a Really Simple Syndication (RSS) feedand set content to be delivered directly to your desktop using a reader application. The RSS feeds are a freeservice and Cisco currently supports RSS version 2.0.
http://www.cisco.com/en/US/products/hw/switches/ps5532/tsd_products_support_series_home.htmlhttp://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.htmlhttp://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.htmlhttp://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.htmlhttp://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.htmlhttp://www.cisco.com/en/US/products/hw/switches/ps5532/tsd_products_support_series_home.html


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PrefaceRelated Publications


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C H A P T E R

1-1Catalyst 3750 Metro Switch Hardware Installation Guide

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1Product Overview

The Catalyst 3750 Metro switch, also referred to as the switch , is a stackable metro Ethernet switch thatcan be used as customer-located equipment (CLE) to connect to enterprise customer routers or switches.You can connect other devices to the switch, including Cisco IP phones, a Cisco Wireless Access Point,workstations, servers, and PCs. This chapter provides a functional overview of the switch.

These topics are included: Features, page 1-1

Front Panel Description, page 1-2

Rear Panel Description, page 1-7

Management Options, page 1-7

FeaturesYou can deploy the switch as an aggregation switch. You can aggregate Ethernet traffic from othernetwork devices with 10BASE-T, 100BASE-TX, and 1000BASE small-form factor pluggable (SFP)modules (1000BASE-T, 1000BASE-BX, 1000BASE-SX, 1000BASE-LX/LH, or 1000BASE-ZX SFPmodules). Refer to the switch software configuration guide for examples that show how you mightdeploy Catalyst 3750 Metro switches in your network.

These are the switch features:

Hardware

24 10/100 Ethernet ports 4 small form-factor pluggable (SFP) module slots. Two are standard SFP module ports, and two

are enhanced-services SFP module ports. The enhanced-services ports support multiprotocollabel switching (MPLS), hierachical quality of service (QoS), and enhanced 802.1Q tunneling.

For information about port numbering, see the Front Panel Description section on page 1-2 .

2 power supply slots that support AC or DC inputFor instructions on installing power supply units, see Chapter 3, Connecting the PowerSupply.

The switch supports these SFP modules:

100BASE-FX (only in the standard SFP module ports) 1000BASE-BX 1000BASE-LX


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Chapter 1 Product OverviewFront Panel Description

1000BASE-SX 1000BASE-T 1000BASE-ZX Coarse wavelength-division multiplexing (CWDM)

Note When you install 1000BASE-T SFP modules in the standard ports, they can operate at 10,100, or 1000 Mb/s in full-duplex mode. When you install 1000BASE-T SFP modules in theenhanced-services ports, they operate only at 1000 Mb/s.

Configuration

For 10/100 ports, autonegotiates the speed and the duplex settings For standard ports, autonegotiates the speed and the duplex settings

Power redundancy through an optional second power supply

Front Panel DescriptionThe switch FastEthernet ports are numbered 1 through 24 (in software they are numberedfastethernet1/0/1 to fastethernet1/0/24). These ports are grouped into pairs. The first member of the pair(port 1) is above the second member (port 2) on the far left, as shown in Figure 1-1 . Port 3 is above port 4,and so on.

Figure 1-1 Catalyst 3750 Metro Switch Front Panel

The standard SFP module ports are numbered 1 and 2 (left to right). In software, they are numberedgigabitethernet1/0/1 and gigabitethernet1/0/2. The enhanced-services SPF module ports are numbered 1and 2 (left to right). In software, they are numbered gigabitethernet 1/1/1 and gigabitethernet 1/1/2.

1 Console port 3 Standard SFP module ports

2 10/100 ports 4 Enhanced-services SFP module ports

SYST

RPSMASTRSTATDUPLXSPEEDSTACK

MODE

1 23 4

5 67 8

9 1011 12

13 1 415 16

17 1 819 20

21 2223 24

Catalyst 3750Metro series

9 7 4 2 4

1X

2X

11X

12X

13X

14X

23X

24X1

2

12

4

23

CONSOLE

1

ES PORTS


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Console PortYou can connect the switch to a PC through the console port by using the supplied RJ-45-to-DB-9 femalecable. If you want to connect the switch console port to a terminal, you need to provide anRJ-45-to-DB-25 female DTE adapter. You can order a kit (part number ACS-DSBUASYN=) containing

that adapter from Cisco. For console port and adapter pinout information, see Appendix B, Connectorand Cable Specifications.

10/100 and 10/100/1000 PortsYou can set the 10/100 ports on the switch to operate in any combination of half duplex, full duplex,10 Mb/s or 100 Mb/s. You can set the standard 1000BASE-T SFP module ports to operate in 10, 100, or1000 Mb/s in full duplex. The 1000BASE-T SFP module operates only at 1000 Mb/s in theenhanced-services ports. You can also set these ports for speed and duplex autonegotiation in compliancewith IEEE 802.3ab. (The default setting is autonegotiate.)

When you set the port for autonegotiation, it identifies the speed and duplex settings of the attached

device and advertises its own capabilities. If the connected device also supports autonegotiation, theswitch port negotiates the best connection (that is, the fastest line speed that both devices support andfull-duplex transmission if the attached device supports it) and configures itself accordingly. In all cases,the attached device must be within 100 meters (328 feet).

100BASE-TX and 1000BASE-T traffic requires a Category 5 or higher cable. 10BASE-T traffic can useCategory 3 or Category 4 cables. When you connect the switch to workstations, servers, routers, andCisco IP Phones, be sure that the cable is a straight-through cable. When you connect the switch toswitches or hubs, use a crossover cable. When you use a straight-through or crossover cable for1000BASE-T connections, be sure to use a twisted four-pair, Category 5 or higher cable for properoperation. Pinouts for the cables are described in Appendix B, Connector and Cable Specifications.

You can use the mdix auto interface configuration command to enable the automatic crossover feature.When the automatic crossover feature is enabled, the switch detects the required cable type and

configures the interfaces accordingly. Therefore, you can use either a crossover or a straight-throughcable for all connections to an Ethernet port on the switch.

The automatic crossover feature is disabled by default. For configuration information for this feature,refer to the switch software configuration guide or the switch command reference .

SFP Module SlotsThe switch uses Gigabit Ethernet SFP modules to establish fiber-optic connections. These transceivermodules are field-replaceable, providing the uplink interfaces when inserted in an SFP module slot.You can use the SFP modules for Gigabit uplink connections to other switches. You use fiber-opticcables with or MT-RJ LC or MT-RJ connectors to connect to a fiber-optic SFP module. You use Category

5 or higher cable with RJ-45 connectors to connect to a copper SFP module.When you install 1000BASE-T SFP modules in the standard ports, they can operate at 10, 100, or 1000Mb/s in full-duplex mode. When you install 1000BASE-T SFP modules in the enhanced-services ports,they operate only at 1000 Mb/s. The switch supports 100BASE-FX SFP modules only in standard ports.See the Features section on page 1-1 for a list of SFP modules that the switch supports.

Refer to the Release Notes for the Catalyst 3750 Metro Switch for the most current list of CiscoSFP module options that the switch supports. For more information about these SFP modules, refer toyour SFP module documentation.


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In addition to supporting the features described previously, the enhanced-services SFP modules supportautonegotiation. Refer to the software guides for this switch for information about the features of theenhanced-services ports.

LEDsYou can use the switch LEDs to monitor switch activity and performance. Figure 1-2 shows the switchLEDs and the Mode button that you use to select one of the port modes.

Figure 1-2 Catalyst 3750 Metro Switch LEDs

System LED

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

1 Mode button 6 Master LED

2 Stack LED (not used) 7 Power B LED3 Speed LED 8 Power A LED

4 Duplex LED 9 System LED

5 Status LED 10 Port LED

PWR A

SYST

PWR BMASTRSTATDUPLXSPEEDSTACK

MODE

9 7 4 2 7

1 2 3 45 6

7 89 10

11 12

1X

2X

11X

12X

13 1415 16

17 1819 20

21 2223 24

13X

14X

23X

24X

10

CONSOLE

21 3 4 8765 9

Table 1-1 System LED

Color System Status

Off System is not powered on.

Green System is operating normally.

Amber System is receiving power but is not functioning properly.


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Power LEDs

The switch supports up to two power supplies. The PWR A and PWR B LEDs show the status of thepower supply in power slot A and power slot B, respectively. Table 1-2 lists the LED colors and theirmeanings.

The power LEDs for slot A and slot B work independently of each other.

Master LEDThe Master LED is used in stacking. For this product, which does not support stacking, the Master LEDis green.

Port LEDs and Modes

Each RJ-45 port and SFP module slot has a port LED. These port LEDs, as a group or individually,display information about the switch and about the individual ports. The port modes determine the typeof information that the port LEDs display. Table 1-3 lists the mode LEDs and their associated port modesand meanings.

To select or change a mode, press the Mode button until the desired mode is highlighted. When you

change port modes, the meanings of the port LED colors also change. Table 1-4 explains how to interpretthe port LED colors in different port modes.

Table 1-2 Power LED Status Indicators

Color Status

Off The power supply is not installed.

Green The power supply is connected and operating correctly.

Amber The power supply is installed but is either in a fault condition or is not connectedto a valid input power source.

Table 1-3 Port Mode LEDs

Mode LED Port Mode Description

STAT Port status The port status. This is the default mode.

DUPLX Port duplex mode The port duplex mode: full duplex or half duplex.

SPEED Port speed The port operating speed: 10 or 100 10, 100, or 1000 Mb/s.

STACK Not used.


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Table 1-4 Meaning of LED Colors in Different Modes on the Switch

Port Mode LED Color Meaning

STAT(port status)

Off No link, or port was administratively shut down.

Green Link present.

Flashing green Activity. Port is sending or receiving data.

Alternatinggreen-amber

Link fault. Error frames can affect connectivity, and errors such asexcessive collisions, CRC 1 errors, and alignment and jabber errorsare monitored for a link-fault indication.

1. CRC = cyclic redundancy check

Amber Port is blocked by Spanning Tree Protocol (STP) and is notforwarding data.

Note After a port is reconfigured, the port LED can remainamber for up to 30 seconds as STP checks the switch forpossible loops.

Flashing

amber

Port is blocked by STP and is sending or receiving packets.

DUPLX(duplex)

Off Port is operating in half duplex.

Green Port is operating in full duplex.

SPEED 10/100 ports

Off Port is operating at 10 Mb/s.

Green Port is operating at 100 Mb/s.

SFP ports

Off Port is operating at 10 Mb/s.

Green Port is operating at 100 Mb/s.

Flashing green Port is operating at 1000 Mb/s.

Note 1000BASE-T SFP modules can operate at 10, 100, or1000 Mb/s in full-duplex mode only in standard SFP ports.

STACK(stack member)

Not used.


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Chapter 1 Product OverviewRear Panel Description

Rear Panel DescriptionThe switch rear panel has two power slots, a grounding lug, and two StackWise ports (not used). (SeeFigure 1-3 .)

Figure 1-3 Catalyst 3750 Metro Switch Rear Panel

Power ConnectorsA power supply that is installed in power slot A powers the switch. This power supply is afield-replaceable unit (FRU). You can connect an optional FRU power supply in slot B to provide backuppower if power supply A fails. You can power the switch by using either an AC power supply, a DC

power supply, or a combination of the two.

Power Supply ConnectorThe power supply is an autoranging unit that supports input voltages between 100 and 240 VAC. Use thesupplied AC power cord to connect the AC power connector to an AC power outlet. See Chapter 3,Connecting the Power Supply, for instructions on how to connect the DC power.

Management OptionsThe switch offers several management options:

Cisco IOS command-line interface (CLI)You can fully configure and monitor the switch from the CLI. You can access the CLI either byconnecting your management station directly to the switch console port or by using Telnet from aremote management station. See Appendix C, Configuring the Switch with the CLI-BasedSetup Program, and refer to the Catalyst 3750 Metro Switch Command Reference on Cisco.com formore information about using the CLI.

1 StackWise ports (not used) 3 Power slot A (shown with an installed ACpower supply)

2 Grounding lug (used with a DC powersupply)

4 Power slot B

9 7 4 2 5

1

S TACK 1S TACK 1

34

2


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Chapter 1 Product OverviewManagement Options

CiscoView application

The CiscoView device-management application displays the switch image that you can use to setconfiguration parameters and to view switch status and performance information. The CiscoViewapplication, which you purchase separately, can be a standalone application or part of a SimpleNetwork Management Protocol (SNMP) platform. Refer to the CiscoView documentation for more

information. SNMP network management

You can manage switches from a SNMP-compatible management station that is running platformssuch as HP OpenView or SunNet Manager. The switch supports a comprehensive set of ManagementInformation Base (MIB) extensions and four Remote Monitoring (RMON) groups. Refer to theswitch software configuration guide on Cisco.com and the documentation that came with yourSNMP application for more information.

Cisco Intelligence Engine 2100 (IE2100)

Cisco IE200 Series Configuration Registrar is a network management device that works withembedded CNS agents in the switch software. You can automate initial configurations andconfiguration updates by generating switch-specific configuration changes, sending them to the

switch, executing the configuration change, and logging the results.

Network ConfigurationsRefer to the switch software configuration guide on Cisco.com for network configuration concepts andexamples of using the switch to create dedicated network segments and interconnecting the segmentsthrough Gigabit Ethernet connections.


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2Switch Installation

This chapter describes how to start your switch and how to interpret the power-on self-test (POST) thatensures proper operation. It describes how to install the switch and make connections to the switch.Read the topics and perform the procedures in this order:

Preparing for Installation, page 2-1

Verifying Switch Operation, page 2-5 Installing the Switch, page 2-7

Installing and Removing SFP Modules, page 2-14

Connecting to the 10/100 Ports, page 2-17

Connecting to an SFP Module, page 2-18

Where to Go Next, page 2-21

Preparing for InstallationThis section covers these topics:

Warnings, page 2-1

Installation Guidelines, page 2-4

Verifying Package Contents, page 2-5

Verifying Switch Operation, page 2-5

WarningsThese warnings are translated into several languages in the Regulatory Compliance and Safety

Information Guide for the Catalyst 3750 Metro Switch , which ships with the switch.

Warning To prevent the switch f rom overheating, do not operate it in an area that exceeds the maximumrecommended ambient temperature of 113F (45C). To prevent airflow restriction, al low at least3 inches (7.6 cm) of clearance around the ventilation openings. Statement 17B


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Chapter 2 Switch InstallationPreparing for Installation

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 cancause serious burns or weld the metal object to the terminals. Statement 43

Warning Do not stack the chassis on any other equipment. If the chassis falls, it can cause severe bodily injuryand equipment damage. Statement 48

Warning Ethernet cables must be shielded when used in a central office environment. Statement 171

Warning To comply with safety regulations, mount switches on a wall with the front panel facing up.Statement 266

Warning Suitable for mounting on or over concrete or other non-combustible surface only. Statement 345

Warning Do not work on the system or connect or disconnect cables during periods of lightning activity.Statement 1001

Warning Read the installation instructions before connecting the system to the power source. Statement 1004

Warning This product relies on the buildings installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than:15 A, 80 Vdc Statement 1005

Warning To prevent bodily injury when mounting or servicing this unit in a rack, you must take specialprecautions to ensure that the system remains stable. The following guidelines are provided toensure 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 provided with stabilizing devices, install the stabilizers before mounting or servicing the unit in

the rack. Statement 1006


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Warning Class 1 laser product. Statement 1008

Warning Avoid direct exposure to the laser beam. Statement 1012

Warning This unit is intended for installation in restricted access areas. A restricted access area can beaccessed only through the use of a special tool, lock and key, or other means of security.Statement 1017

Warning The plug-socket combination must be accessible at all times, because it serves as the maindisconnecting device. Statement 1019

Warning A readily accessible two-poled disconnect device must be incorporated in the fixed wiring.Statement 1022

Warning This equipment must be grounded. Never defeat the ground conductor or operate the equipment in theabsence of a suitably install ed ground conductor. Contact the appropriate electrical inspectionauthority or an electrician if you are uncertain that suitable grounding is available. Statement 1024

Warning This unit might have more than one power supply connection. All connections must be removed tode-energize the unit. Statement 1028

Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment.Statement 1030

Warning Ultimate disposal of this product should be handled according to all national laws and regulations.Statement 1040

Warning For connections outside the building where the equipment is installed, the following ports must beconnected through an approved network termination unit with integral circuit protection.

10/100/1000 Ethernet Statement 1044

Warning When install ing or replacing the unit, the ground connect ion must always be made first anddisconnected last. Statement 1046

Warning No user-serviceable parts inside. Do not open. Statement 1073


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Warning Installation of the equipment must comply with local and national electrical codes. Statement 1074

Caution To comply with the Telcordia GR-1089 Network Equipment Building Systems (NEBS) standard forelectromagnetic compatibility and safety, connect the Ethernet cables only to intrabuilding or unexposedwiring or cabling.

Note For a list of EMC regulatory statements, see the Regulatory Compliance and Safety Information for theCatalyst 3750 Metro Switch .

Guidelines for Particulate MatterCisco Ethernet Switches are equipped with cooling mechanisms, such as fans and blowers. However,

these fans and blowers can draw dust and other particles, causing contaminant buildup inside the chassis,which can result in a system malfunction.

You must install this equipment in an environment as free as possible from dust and foreign conductivematerial (such as metal flakes from construction activities).

These standard provide guidelines for acceptable working environments and acceptable levels ofsuspended particulate matter:

Network Equipment Building Systems (NEBS) GR-63-CORE

National Electrical Manufacturers Association (NEMA) Type 1

International Electrotechnical Commission (IEC) IP-20

Installation GuidelinesWhen you determine where to place the switch, be sure to observe these restrictions:

When you connect cables from 10/100 ports and 1000BASE-T SFP module ports to other devices,you can use cable lengths up to 328 feet (100 meters).

See Table B-2 on page B-5 for a list of cable specifications for 1000BASE-SX, 1000BASE-LX,1000BASE-BX, 1000BASE-ZX, and CWDM fiber-optic SFP module connections. Each port mustmatch the wave-length specifications on the other end of the cable, and for reliable communications,the cable must not exceed the stipulated cable length.

Note When you use shorter distances of single-mode fiber cable, you might need to insert aninline optical attenuator in the link to avoid overloading the receiver.

When the fiber-optic cable span is less than 15.5 miles (25 km), you should insert a5-decibel (dB) or 10-dB inline optical attenuator between the fiber-optic cable plant and thereceiving port on the 1000BASE-ZX SFP module at each end of the link.

Operating environment must be within the ranges listed in Appendix A, Technical Specifications.


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Clearance to front and rear panels should be such that

You can easily read the front-panel indicators. Access to ports is sufficient for unrestricted cabling.

Make sure that there is access to the rear of the rack if you are planning to stack the switches.If you do not have access to the rear panel, make sure that you cable the switches before yourack-mount them.

The AC power cord can reach from the AC power outlet to the connector on the switch rearpanel.

Cabling must be away from sources of electrical noise, such as radios, power lines, and fluorescentlighting fixtures. Make sure the cabling is safely away from other devices that might damage thecables.

Airflow around the switch and through the vents must be unrestricted.

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

Note If you install the switch in a closed or multirack assembly, the temperature around it might begreater than normal room temperature.

Verifying Package Contents

Note Carefully remove the contents from the shipping container, and check each item for damage. If any itemis missing or damaged, contact your Cisco representative or reseller for support. Return all packingmaterial to the shipping container, and save it.

The switch is shipped with these items:

Catalyst 3750 Metro Switch Getting Started Guide

Regulatory Compliance and Safety Information for the Catalys t 3750 Metro Switch

AC power supply (installed) or a DC power supply (installed with ground lug installed)

AC power cord (AC-powered switches)

2 DC terminal block plugs (used with DC-powered switches but shipped with both)

One RJ-45-to-DB-9 adapter cable

Mounting kit containing:

Four rubber feet for mounting the switch on a table Two 19-inch rack-mounting brackets

Four Phillips flat-head screws for attaching the brackets to the switch Four Phillips machine screws for attaching the brackets to a rack Four Phillips truss-head screws and a bracket for mounting the switch on a wall One cable guide and one black Phillips machine screw for attaching the cable guide to one of

the mounting brackets

Two terminal block plugs One RPS connector cover with 2 number-4 panhead screws (not used with this switch)


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Verifying Switch OperationBefore installing the switch in a rack, on a wall, or on a table or shelf, you should power the switch andverify that the switch passes POST. These sections describe the steps required to connect a PC to theswitch console port and to power on the switch:

Connecting a PC or Terminal to the Console Port, page 2-6

Powering On the Switch and Running POST, page 2-7

Connecting a PC or Terminal to the Console Port

To connect a PC to the console port, use the supplied RJ-45-to-DB-9 adapter cable . To connect the switchconsole port to a terminal, you need to provide a RJ-45-to-DB-25 female DTE adapter. You can order akit (part number ACS-DSBUASYN=) containing that adapter from Cisco. For console port and adapterpinout information, see the Cable and Adapter Specifications section on page B-5 .

You can use terminal-emulation softwarefrequently a PC application such as Hyperterminal orProcomm Plusto make communication between the switch and your PC or terminal possible.

Follow these steps to connect the PC or terminal to the switch:

Step 1 Configure the baud rate and character format of the PC or terminal to match these console port defaultcharacteristics:

9600 baud

8 data bits

1 stop bit

No parity

None (flow control)

Step 2 Use the supplied RJ-45-to-DB-9 adapter cable to insert the RJ-45 connector into the console port, asshown in Figure 2-1 .

Figure 2-1 Connecting to the Console Port

1 Console port

9 7 4 6 3

1 23 4

5 67 8

9 1011 12

1X

2X

11X

12X

CONSOLE

PWR A

SYST


MODE

1


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Chapter 2 Switch InstallationInstalling the Switch

Step 3 Attach the DB-9 female DTE adapter of the RJ-45-to-DB-9 adapter cable to a PC, or attach anappropriate adapter to the terminal.

Step 4 Start the terminal-emulation program if you are using a PC or terminal.

Powering On the Switch and Running POST

To power on the switch, follow these steps:

Step 1 Make sure that you have started the terminal emulation software program (such as ProComm,HyperTerminal, tip, or minicom) from your management station. See the Connecting a PC or Terminalto the Console Port section on page 2-6 for information on connecting to the switch console port.

Step 2 If you are using an AC power supply, connect one end of the AC power cord to the AC power connectoron the switch, and then connect the other end of the power cord to an AC power outlet.

Step 3 If you are using a DC power supply, see the Connecting to DC Power section on page 3-4 forinstructions on how to connect the DC power supply.

Step 4 Secure the power cord with the power cord retainer. For more information, see the Connecting to ACPower section on page 3-1 .

As the switch powers on, it begins POST, a series of tests that run automatically to ensure that the switchfunctions properly. When the switch begins POST, the System, the Power A, the Power B, the Master,the Status, the Duplex, the Speed, and the Stack LEDs turn green. The System LED blinks green, andthe other LEDs remain continuous green. If POST fails, see Chapter 4, Troubleshooting, to determinea course of action.

When the POST is complete, the System LED remains green. The Power A LED remains green for sometime and then resumes operating status. The other LEDs turn off and resume their operating status.

Powering Off the Switch and Disconnecting the Console Port

Disconnect the power cord from the switch. Disconnect the cable from the switch console port. Installthe switch in a rack, on a wall, or on a table or shelf as described in the Installing the Switch sectionon page 2-7 .

Installing the SwitchThis section describes these installation procedures:

Rack-Mounting, page 2-7 Wall-Mounting, page 2-12

Table- or Shelf-Mounting, page 2-14


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Rack-MountingTo install the switch in a 19-inch or 24-inch rack (24-inch racks require optional mounting hardware),follow the instructions described in these procedures:

Removing Screws from the Switch, page 2-8

Attaching Brackets to the Switch, page 2-8

Mounting the Switch in a Rack, page 2-11

Attaching the Cable Guide, page 2-12

Note Installing the switch in a 24-inch rack requires an optional bracket kit not included with the switch. Youcan order a kit containing the 24-inch rack-mounting brackets and hardware from Cisco (part numberRCKMNT-1RU).

Removing Screws from the Switch

If you plan to install the switch in a rack, you must first remove the screws in the switch chassis so thatyou can attach the mounting brackets. Figure 2-2 shows how to remove the chassis screws in a switch.

Figure 2-2 Removing Screws from the Switch

Warning To prevent bodily injury when mounting or servicing this unit in a rack, you must take specialprecautions to ensure that the system remains stable. The following guidelines are provided toensure 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 heaviestcomponent at the bottom of the rack.

If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the unit in the rack. Statement 1006

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Attaching Brackets to the Switch

The bracket orientation and the brackets that you use depend on whether you are attaching the bracketsfor a 19-inch or a 24-inch rack. For 19-inch racks, use bracket part number 700-8209-XX; for 24-inchracks, use bracket part number 700-13248-XX. Figure 2-3 through Figure 2-7 show how to attach eachtype of bracket to one side of the switch. Follow the same steps to attach the second bracket to theopposite side.

Figure 2-3 Attaching Brackets for 19-Inch Racks, Front Panel Forward

Figure 2-4 Attaching Brackets for 24-Inch Racks, Front Panel Forward

Figure 2-5 Attaching Brackets for 19-Inch Racks, Rear Panel Forward

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Figure 2-6 Attaching Brackets for 24-Inch Racks, Rear Panel Forward

Figure 2-7 Attaching Brackets for 24-Inch Telco Racks


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Mounting the Switch in a Rack

After the brackets are attached to the switch, use the four supplied number-12 Phillips machine screwsto securely attach the brackets to the rack, as shown in Figure 2-8 .

Figure 2-8 Mounting the Switch in a Rack

After the switch is mounted in the rack, perform these tasks to complete the installation, run the setupprogram, and access the switch:

Connect to the console port, and start the emulation software. See the Connecting to the ConsolePort section on page C-3 and the Starting the Terminal-Emulation Software section on page C-3

Power on the switch. See the Connecting to a Power Source section on page C-4 .

Run the setup program. See the Completing the Setup Program section on page C-5 .

Connect to the front-panel ports. See the Connecting to the 10/100 Ports section on page 2-17 andthe Connecting to an SFP Module section on page 2-18 to complete the installation.

To use the CLI, enter commands at the Switch> prompt through the console port by using a terminalprogram or through the network by using Telnet. For configuration information, refer to the switchsoftware configuration guide or the switch command reference.

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Attaching the Cable Guide

We recommend that you attach the cable guide to prevent the cables from obscuring the front panel ofthe switch and the other devices that are installed in the rack. Use the supplied black screw, as shown inFigure 2-9 , to attach the cable guide to the left or right bracket.

Figure 2-9 Attaching the Cable Guide on the Switch

Wall-MountingTo install the switch on a wall, follow these instructions:

Attaching the Brackets to the Switch for Wall-Mounting, page 2-12

Mounting the Switch on a Wall, page 2-13

Attaching the Brackets to the Switch for Wall-Mounting

Figure 2-10 shows how to attach two 19-inch brackets to one side of the switch. Follow the same stepsto attach the other two brackets to the opposite side.

Figure 2-10 Attaching the 19-inch Brackets for Wall-Mounting

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Mounting the Switch on a Wall

For the best support of the switch and cables, make sure that the switch is attached securely to wall studsor to a firmly attached plywood mounting backboard. Mount the switch with the front panel facing up,as shown in Figure 2-11 .

Warning To comply with safety regulations, mount switches on a wall with the front panel facing up.Statement 266

Warning Suitable for mounting on or over concrete or other non-combustible surface only. Statement 345

Figure 2-11 Mounting the Switch on a Wall

After the switch is mounted on the wall, perform these tasks to complete the installation, to run the setupprogram, and to access the switch:

Connect to the console port, and start the emulation software. See the Connecting to the ConsolePort section on page C-3 and the Starting the Terminal-Emulation Software section on page C-3

Power on the switch. See the Connecting to a Power Source section on page C-4 .

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Chapter 2 Switch InstallationInstalling and Removing SFP Modules

Installing SFP Modules into SFP Module SlotsThis section provides instructions for how to install an SFP module that has a bale-clasp latch.

Caution We strongly recommend that you do not install or remove fiber-optic SFP modules with cables attachedbecause of the potential damage to the cables, the cable connector, or the optical interfaces in theSFP module. Disconnect all cables before removing or installing an SFP module.

Removing and installing an SFP module can shorten its useful life. Do not remove and insert SFPmodules more often than is absolutely necessary.

Note Refer to the Installation Notes for the Cisco Small Form-Factor Pluggable Module s on cisco.com forinstructions to install SFPs that use other types of latches.

Figure 2-12 shows an SFP module that has a bale-clasp latch.

Figure 2-12 SFP Module with a Bale-Clasp Latch

To insert an SFP module into the SFP module slot, follow these steps:

Step 1 Attach an ESD-preventive wrist strap to your wrist and to a bare metal surface on the chassis.

Step 2 Find the send (TX) and receive (RX) markings that identify the top side of the SFP module.

Note On some SFP modules, the send and receive (TX and RX) markings might be replaced by arrowsthat show the direction of the connection, either send or receive (TX or RX).

Step 3 Align the SFP module in front of the slot opening.

Step 4 Insert the SFP module into the slot until you feel the connector on the module snap into place in the rear

of the slot. (See Figure 2-13 .)

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Chapter 2 Switch InstallationInstalling and Removing SFP Modules

Figure 2-13 Installing an SFP Module into an SFP Module Slot

Step 5 For fiber-optic SFP modules, remove the dust plugs from the optical ports and store them for later use.

Caution Do not remove the dust plugs from the fiber-optic SFP module port or the rubber caps from thefiber-optic cable until you are ready to connect the cable. The plugs and caps protect the SFP moduleports and cables from contamination and ambient light.

Step 6 Insert the cable connector into the SFP module:

For fiber-optic SFP modules, insert the LC or MT-RJ cable connector into the SFP module. For copper SFP modules, insert the RJ-45 cable connector into the SFP module.

Note When you connect to 1000BASE-T SFP modules, be sure to use a twisted four-pair, Category 5or higher cable.

Removing SFP Modules from SFP Module SlotsTo remove an SFP module from a module receptacle, follow these steps:

Step 1 Attach an ESD-preventive wrist strap to your wrist and to a bare metal surface on the chassis.

Step 2 Disconnect the cable from the SFP module.

Tip For reattachment, note which cable connector plug is send (TX) and which is receive (RX).

Step 3For fiber-optic SFP modules, insert a dust plug into the optical ports of the SFP module to keep theoptical interfaces clean.

Step 4 Unlock and remove the SFP module, as shown in Figure 2-14 .

Pull the bale-clasp latch out and down to eject the module. If the bale-clasp latch is obstructed and youcannot use your index finger to open it, use a small, flat-blade screwdriver or other long, narrowinstrument to open the bale-clasp latch.

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Chapter 2 Switch InstallationConnecting to the 10/100 Ports

Figure 2-14 Removing a Bale-Clasp Latch SFP Module by Using a Flat-Blade Screwdriver

Step 5 Grasp the SFP module between your thumb and index finger, and carefully remove it from themodule slot.

Step 6 Place the removed SFP module in an antistatic bag or other protective environment.

Connecting to the 10/100 PortsThe switch 10/100 ports configure themselves to operate at the speed of attached devices. If the attachedports do not support autonegotiation, you can set the speed and duplex parameters. Connecting devices

that do not autonegotiate or that have their speed and duplex parameters manually set can reduceperformance or result in no linkage.

To maximize performance, choose one of these methods for configuring the Ethernet ports:

Let the ports autonegotiate both speed and duplex.

Set the port speed and duplex parameters on both ends of the connection.

Follow these steps to connect to 10BASE-T or 100BASE-TX devices:

Caution To prevent electrostatic-discharge (ESD) damage, follow your normal board and component handlingprocedures.

Step 1 When you connect to workstations, servers, routers, and Cisco IP Phones, connect a straight-throughcable to an RJ-45 connector on the front panel. (See Figure 2-15 .) When you connect to switches orrepeaters, use a crossover cable. (See the Identifying a Crossover Cable section on page B-8 forcable-pinout descriptions.)

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Chapter 2 Switch InstallationConnecting to an SFP Module

Note When you connect to 1000BASE-T-compatible devices, be sure to use a twisted four-pair,Category 5 or higher cable. See the Four Twisted-Pair Cable Pinouts for 10/100 Ports sectionon page B-7 for more information.

Figure 2-15 Connecting to an Ethernet Port

Note You can use the mdix auto interface configuration command in the CLI to enable the automaticcrossover feature. When the automatic crossover feature is enabled, the switch detects therequired cable type and configures the interfaces accordingly. Therefore, you can use either acrossover or a straight-through cable for all connections to an Ethernet port on the switch.

The automatic crossover feature is disabled by default. For configuration information for thisfeature, refer to the switch software configuration guide or the switch command reference.

Step 2 Connect the other end of the cable to an RJ-45 connector on the other device. Repeat Steps 1 through 3to connect each device.

Connecting to an SFP ModuleThis section describes how to connect to SFP modules. For instructions on how to connect to fiber-opticSFP modules, see the Connecting to a Fiber-Optic SFP Module section on page 2-19 section. Forinstructions on how to connect to 1000BASE-T SFP modules, see the Connecting to 1000BASE-T SFPModules section on page 2-20 section.

For instructions about how to install or remove an SFP module, see the Installing and Removing SFPModules section on page 2-14 .

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Connecting to a Fiber-Optic SFP ModuleFollow these steps to connect a fiber-optic cable to an SFP module:

Caution Do not remove the rubber plugs from the SFP module port or the rubber caps from the fiber-optic cableuntil you are ready to connect the cable. The plugs and caps protect the SFP module ports and cablesfrom contamination and ambient light.

Before you connect to the SFP module, be sure that you understand the port and cabling stipulations inthe Installation Guidelines section on page 2-4 and in the SFP Module Slots section on page 1-3 .See Appendix B, Connector and Cable Specifications, for information about the LC on the SFPmodule.

Step 1 Remove the rubber plugs from the module port and fiber-optic cable, and store them for future use.

Step 2 Insert one end of the fiber-optic cable into the SFP module port (see Figure 2-16 ).

Step 3Insert the other cable end into 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 the STP discovers the network topology and searches for loops. This processtakes about 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 mightbe problem with the adapter installed in the target device. See Chapter 4, Troubleshooting, forsolutions to cabling problems.

Figure 2-16 Connecting to a Fiber Optic SFP Module Port

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Step 5 If necessary, reconfigure and restart the switch or target device.

Caution For detailed instructions on removing the SFP modules, refer to your SFP documentation.

Connecting to 1000BASE-T SFP ModulesFollow these steps to connect a Category 5 or higher cable to a 1000BASE-T SFP module:

Caution To prevent ESD damage, follow your normal board and component handling procedures.

Step 1 When you connect to servers, workstations, and routers, insert a four twisted-pair, straight-through cablein the RJ-45 connector. When you connect to switches or repeaters, insert a four twisted-pair, crossover

cable. (See Figure 2-17 .)

Note When you connect to a 1000BASE-T device, be sure to use a four twisted-pair, Category 5 orhigher cable.

Figure 2-17 Connecting to a 1000BASE-T SFP Module Port

Step 2 Insert the other cable end in an RJ-45 connector 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 the STP discovers the network topology and searches for loops. This processtakes about 30 seconds, and then the port LED turns green.

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Chapter 2 Switch Installation Where to Go Next

If the LED is off, the target device might not be turned on, there might be a cable problem, or there mightbe problem with the adapter installed in the target device. See Chapter 4, Troubleshooting forsolutions to cabling problems.

Step 4 If necessary, reconfigure and restart the switch or target device.

Where to Go NextIf the default configuration is satisfactory, the switch does not need further configuration. You can useany of these management options to change the default configuration:

Use the CLI to configure the switch from the console. See Appendix C, Configuring the Switchwith the CLI-Based Setup Program, and refer to the switch command reference on Cisco.com forinformation on using the CLI with a Catalyst 3750 Metro switch.

Start an SNMP application such as the CiscoView application.


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Chapter 2 Switch Installation Where to Go Next


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C H A P T E R


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3Connecting the Power Supply

This chapter describes how to connect the AC and DC power supply units and how to remove them.See these sections:

Connecting to AC Power, page 3-1

Removing the AC Power Supply, page 3-3

Connecting to DC Power, page 3-4

Removing the DC Power Supply, page 3-12

Connecting to Both AC and DC Power in the Switch, page 3-13


Caution If you use only one power supply in your switch, always cover the other power slot with the slot cover.

Connecting to AC PowerTo connect the switch to an AC-input power source, follow these steps:

Warning This unit is intended for installation in restricted access areas. A restricted access area can beaccessed only through the use of a special tool, lock and key, or other means of security.Statement 1017


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Chapter 3 Connecting the Power SupplyConnecting to AC Power

Before you start, locate a Phillips screwdriver and your AC power cord. Figure 3-1 shows the locationof the AC power supply parts.

Figure 3-1 AC Power Supply

To insert an AC power supply into power supply slot A or B, follow these steps:

Step 1 Insert the power supply partially into the power supply slot (see Figure 3-2 ).

Figure 3-2 Inserting the AC Power Supply

Step 2 Slide the power-on restrictor to the left, toward the power connector (see Figure 3-3 ).

Note The power supply unit will not slide completely into the power slot if the power cord is alreadyinserted into the power connector.

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Chapter 3 Connecting the Power SupplyRemoving the AC Power Supply

Figure 3-3 AC Power Cord Retainer and Power-On Restrictor

Step 3 Slide the power supply unit the rest of the way into the power slot.

Step 4 Slide the power-on restrictor to the right in order to access the power connector (see Figure 3-3 ).

Step 5 Use a Phillips screwdriver to attach the screw at the lower-left of the power supply, and secure the powersupply unit in the switch chassis.

Step 6 Insert the power cord into the power connector.

Step 7 Snap the AC power cord retainer into place to secure the power cord (see Figure 3-3 ).

Step 8 Turn on the power at the power source.

Removing the AC Power SupplyTo remove a power supply from power supply slot A or B, follow these steps:

Step 1 Turn off the power at its source.

Step 2 Detach the power cord retainer from the power cord.

Step 3 Remove the power cord from the power connector.

Step 4 Use a Phillips screwdriver to remove the screw at the lower-left that secures the power supply unit tothe switch chassis (see Figure 3-3 ).

Step 5 Slide the power-on restrictor toward the left.

Step 6 Remove the power supply unit from the power slot by pulling on the power-on restrictor (see Figure 3-3 )

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Chapter 3 Connecting the Power SupplyConnecting to DC Power

Connecting to DC PowerTo connect the switch to a DC-input power source, follow these steps:

1. Preparing for Installation, page 3-4

2. Grounding the Switch, page 3-53. Installing the DC Power Supply in the Switch, page 3-7

4. Wiring the DC-Input Power Source, page 3-9

Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit.Statement 1003

Warning This product relies on the buildings installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than:15 A, 80 Vdc Statement 1005

Note We recommend that you use 18 AWG copper wiring for Network Equipment Building Systems (NEBS)installation. This guideline follows the standard guidelines for DC power wiring in the Central Office.

Preparing for InstallationLocate the terminal block plug that ships with the DC power supply.

Obtain these necessary tools and equipment:

Ratcheting torque screwdriver with a Phillips head that exerts up to 15 pound-force inches (lbf-in.)of pressure

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 ground wire (insulated or noninsulated)

Four leads of 18-gauge copper wire. The DC terminal block also accepts 12-28 AWG copper wire(see Figure 3-11 on page 3-9 ).

Note We recommend that you use 18 AWG copper wiring for Network Equipment Building Systems(NEBS) installations. This guideline follows the standard guidelines for DC power wiring in theCentral Office.

Wire-stripping tools for stripping 6- and 18-gauge wires


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Grounding the Switch

Warning This equipment must be grounded. Never defeat the ground conductor or operate the equipment in theabsence of a suitably install ed ground conductor. Contact the appropriate electrical inspectionauthority or an electrician if you are uncertain that suitable grounding is available. Statement 1024

Warning When install ing or replacing the unit, the ground connect ion must always be made first anddisconnected last. Statement 1046

Caution To make sure that the equipment is reliably connected to earth ground, follow the groundingprocedure instructions, and use a UL-listed lug suitable for number-6 AWG wire and two number-10-32ground-lug screws.

Preparing the Ground WireBefore you ground the switch to earth ground, you must prepare the ground wire. Follow these steps.Make sure to follow any grounding requirements at your site.

Step 1 Locate the ground lug and the two number-10-32 screws on the rear panel of the switch.

Use a standard Phillips screwdriver or a ratcheting torque screwdriver with a Phillips head to remove theground lug. Set the screws and the ground lug aside.

Step 2 If your ground wire is insulated, use a wire stripping tool to strip the 6-gauge ground wire to 0.5 inch(12.7 millimeter [mm]) 0.02 inch (0.5 mm) as shown in Figure 3-4 .

Figure 3-4 Stripping the Ground Wire

Step 3 Slide the open end of the ground lug over the exposed area of the 6-gauge wire.

Step 4 Using a Panduit crimping tool, crimp the ground lug to the 6-gauge wire (see Figure 3-5 ).

InsulationWire lead

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Figure 3-5 Crimping the Ground Lug

Step 5 Use the two number-10-32 screws to attach the ground lug and wire assembly to the rear panel of theswitch.

Step 6 Using a ratcheting torque screwdriver, torque each grounding-lug screw to 15 lbf-in. (240 ounce-forceinches [ozf-in.]). Figure 3-6 shows how to torque the grounding-lug screws on a switch.

Figure 3-6 Torquing Ground-Lug Screws

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Connecting the Grounding Wire to Earth Ground

Next you must connect the other end of the grounding wire to an appropriate grounding point at yoursite or to the telco rack (see Figure 3-7 ).

Figure 3-7 Connecting the Grounding Wire to the Rack

Complete these steps:

Step 1 Remove all paint or oxidation from the rack at the point of the grounding connection.

Step 2 Use a 3/16-inch flat-head screwdriver to loosen the grounding screw on the rack.

Step 3 Connect the wire to a ring lug (large enough for the rack screw to fit through).

Step 4 Use a 3/16-inch flat-head screwdriver and the screw to attach the ring lug to the rack.

Step 5 Tighten the grounding screw on the rack over the ring lug.

Repeat these steps for each switch being installed.

Installing the DC Power Supply in the SwitchFigure 3-8 shows the location of the DC power supply parts.

Figure 3-8 DC Power Supply

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To insert an DC power supply into power supply slot A or B, follow these steps:

Step 1 Insert the power supply partially into the power slot (see Figure 3-9 ).

Figure 3-9 Inserting the DC Power Supply

Step 2 Slide the power-on restrictor to the left, toward the power connector (see Figure 3-10 ).

Note The power supply unit will not slide completely into the power slot if the terminal block isalready inserted into the terminal block plug.

Figure 3-10 DC Power-On Restrictor

Step 3 Slide the power supply unit the rest of the way into the power slot.

Step 4 Slide the power-on restrictor to the right to access the power connector (see Figure 3-10 ).

Step 5 Use a Phillips screwdriver to attach the screw at the lower-left and secure the power supply unit in theswitch chassis.

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Wiring the DC-Input Power Source

Warning A readily accessible two-poled disconnect device must be incorporated in the fixed wiring.Statement 1022


Warning Installation of the equipment must comply with local and national electrical codes. Statement 1074

Caution You must connect the switch only to a DC-input power source that has an input supply voltage from 36to 72 VDC. If the supply voltage is not in this range, the switch might not operate properly or might be

damaged.

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

Step 1 Locate the terminal block plug (see Figure 3-11 ).

Figure 3-11 Terminal Block Plug

Step 2 Identify the positive and negative feed positions for the terminal block connection. The wiring sequenceis positive to positive and negative to negative for both the A and the B feed wires.

The rear panel of the power supply unit identifies the positive and negative positions for both the A andB feed wires. Figure 3-12 shows the positions on the power supply.

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Figure 3-12 Positive and Negative Positions

Step 3 Using an 18-gauge wire-stripping tool, strip each of the four wires coming from the DC-input powersource to 0.27 inch (6.6 mm) 0.02 inch (0.5 mm). Do not strip more than 0.29 inch (7.4 mm) ofinsulation from the wire. Stripping more than the recommended amount of wire can leave exposed wirefrom the terminal block plug after installation. (See Figure 3-13 .)

Figure 3-13 Stripping the DC-Input Power Source Wire

Step 4 Insert the exposed wire of one of the four DC-input power source wires into the terminal block plug, asshown in Figure 3-14 . Make sure that you cannot see any wire lead. Only wire with insulation shouldextend from the terminal block.

Figure 3-14 Inserting Wires in the Terminal Block Plug

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Step 5 Use a ratcheting torque screwdriver to torque the terminal block captive screw (above the installed wirelead) to 4.5 lbf-in. (72 ozf-in.). (See Figure 3-15 .)

Caution Do not overtorque the terminal-block captive screws. The recommended maximum torque is 4.5 lbf-in.

Figure 3-15 Torquing the Terminal-Block Captive Screws

Step 6 Repeat Steps 4 and 5 for the remaining three DC-input power source wires. Figure 3-16 shows thecompleted wiring of a terminal block plug.

Figure 3-16 Completed Wiring of Terminal Block Plug

6 0 5 3 3

Torque to 4.5 lbf-in. (72 ozf-in.)

1 Feed A Negative 3 Feed B Negative

2 Feed A Return 4 Feed B Return

9 7 4 8 2

1

2

3

4


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Chapter 3 Connecting the Power SupplyRemoving the DC Power Supply

Step 7 Insert the terminal block plug in the terminal block header of the power supply (see Figure 3-17 ).

Figure 3-17 Inserting the Terminal Block Plug

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.

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

Removing the DC Power SupplyTo remove a power supply from power supply slot A or B, follow these steps:

Step 1 Move the circuit-breaker to the off position.

Step 2 Detach the terminal block plug from the terminal block header of the power supply.

Step 3 Slide the power-on restrictor towards the left (see Figure 3-18 ).

Figure 3-18 DC Power-On Restrictor

9 7 9 6 0

1 Power-on restrictor

9 7 4 6 9

1


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Chapter 3 Connecting the Power SupplyConnecting to Both AC and DC Power in the Switch

Step 4 Use a Phillips screwdriver to remove the screw at the lower-left that secures the power supply unit tothe switch chassis.

Step 5 Remove the power supply unit from the power slot by pulling on the power-on restrictor (seeFigure 3-18 ).

Connecting to Both AC and DC Power in the SwitchYou can install an AC power supply or a DC power supply in either slot. You can also install an ACpower supply in one slot and a DC power supply in the other slot.

Caution If a DC power supply is present in your configuration, you must install a grounding lug on the switch.

See the section that applies to your configuration:

To install an AC power supply in one of the slots, see the Connecting to AC Power section onpage 3-1 .

To install a DC power supply in either slot, see the Connecting to DC Power section on page 3-4 .

To remove an AC power supply, see the Removing the AC Power Supply section on page 3-3 .

To remove a DC power supply, see the Removing the DC Power Supply section on page 3-12 .

Warning This unit might have more than one power supply connection. All connections must be removed tode-energize the unit. Statement 1028


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4Troubleshooting

The LEDs on the front panel provide troubleshooting information about the switch. They show failuresin the power-on self-test (POST), port-connectivity problems, and overall switch performance. For a fulldescription of the switch LEDs, see the LEDs section on page 1-4 .

You can also get statistics from the browser interface, from the command-line interface (CLI), or from

a Simple Network Management Protocol (SNMP) workstation. See the software configuration guide, theswitch command reference guide on Cisco.com, or the documentation that came with your SNMPapplication for details.

This chapter describes these topics for troubleshooting problems:

Diagnosing Problems, page 4-1

Clearing the Switch IP Address and Configuration, page 4-5

Finding the Switch Serial Number, page 4-6

Diagnosing ProblemsThe LEDs on the front panel provide troubleshooting information about the switch. They show POSTfailures, port-connectivity problems, and overall switch performance. You can also get statistics from theCLI or from an SNMP workstation. See the software configuration guide and the switch commandreference on Cisco.com or the documentation that came with your SNMP application for moreinformation.

This section includes these troubleshooting topics:

Verify Switch POST Results section on page 4-2

Monitor Switch LEDs section on page 4-2

Verify Switch Connections section on page 4-2

Monitor Switch Performance section on page 4-4


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Chapter 4 TroubleshootingDiagnosing Problems

Verify Switch POST ResultsAs the switch powers on, it begins the POST, a series of tests that runs automatically to ensure that theswitch functions properly. It might take several minutes for the switch to complete POST.

When the switch begins POST, the system LED slowly blinks green. When POST completes, the systemLED blinks amber. If POST fails, the system LED remains amber. If POST completes successfully, thesystem LED rapidly blinks green.

Note POST failures are usually fatal. Contact your Cisco technical support representative if your switch doesnot pass POST.

Monitor Switch LEDsYou must have physical access to the switch to do this. Look at the port LEDs for troubleshootinginformation about the switch. See the LEDs section on page 1-4 for a description of the LED colors

and their meanings.

Verify Switch ConnectionsReview these sections when troubleshooting switch connectivity problems:

Bad or Damaged Cable, page 4-2

Ethernet and Fiber Cables, page 4-3

Link Status, page 4-3

Transceiver Module Port Issues, page 4-3

Port and Interface Settings, page 4-3

Ping the End Device, page 4-4

Spanning Tree Loops, page 4-4

Bad or Damaged Cable

Always look at the cable for marginal damage or failure. A cable might connect at the physical layer butthen cause packet corruption because of subtle damage to its wiring or connectors. You can identify thissituation because the port will have many packet errors, or the port constantly loses and regains link. Inthese situations:

Change the copper or fiber-optic cable with a known, good cable if necessary.

Look for broken or missing pins on cable connectors. Rule out any insufficient patch panel connections or media convertors between the source and the

destination. If possible, bypass the patch panel or eliminate faulty media convertors, such asfiber-optic-to-copper convertors.

Try using the cable in another port or interface to see if the problem also exists there.


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Ethernet and Fiber Cables

Make sure that you have the correct cable type for the connection:

For Ethernet, use Category 3 copper cable for 10 Mb/s unshielded twisted pair (UTP) connections.Use either Category 5, Category 5e, or Category 6 UTP for 10/100 or 10/100/1000 Mb/s

connections. For fiber-optic connectors, verify that you have the correct cable for the distance and port type.

Make sure that the ports on the connected device match and that they use the same type of encoding,optical frequency, and fiber type. For more information about cabling, see Appendix B, Connectorand Cable Specifications.

For copper connections, determine if a crossover cable was used when a straight-through cable wasrequired or the reverse. Enable auto-MDIX on the switch, or replace the cable.

Link Status

Verify that both sides have link. A single broken wire or one shutdown port can cause one side to showlink, but the other side does not have link.

A link LED does not guarantee that the cable is fully functional. The cable might have encounteredphysical stress that causes it to function at a marginal level. If the link light for the port does not come on:

Connect the cable from the switch to a known, good device.

Make sure that both ends of the cable are connected to the correct ports.

Verify that both devices have power.

Verify that you are using the correct cable type. See Appendix B, Connector and CableSpecifications. for more information.

Look for loose connections. Sometimes a cable appears to be seated, but is not. Disconnect and thenreconnect the cable.

Transceiver Module Port Issues

Use only Cisco SFP modules on the switch. Each Cisco module has an internal serial EEPROM that isencoded with security information. This encoding provides a way for Cisco to identify and validate thatthe module meets the requirements for the switch. Check these items:

Bad or incorrect SFP module. Exchange the suspect module with a known, good module. Verify thatthis module supports this platform. See the Features section on page 1-1 for a list of supportedSFP modules.

Use the show interfaces privileged EXEC command to check the port or module error-disabled,disabled, or shutdown status. Re-enable the port if necessary.

Make sure that all you have properly cleaned and securely connected all fiber-optic connections.

Port and Interface Settings

An obvious but sometimes overlooked cause of port connectivity failure is a disabled port. Verify thatthe port or interface is not disabled or for some reason powered off. If a port or interface is manuallyshut down on one or the other side of the link, the link does not come up until you re-enable the port.


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Use the show interfaces privileged EXEC command to verify the port or interface error-disabled,disabled, or shutdown status on both sides of the connection. If necessary, re-enable the port or theinterface.

Ping the End Device

Verify the end device connection by first pinging it from the directly connected switch, and then workyour way back port by port, interface by interface, trunk by trunk, until you find the source of theconnectivity issue. Make sure that each switch can identify the end device MAC address in itsContent-Addressable Memory (CAM) table.

Spanning Tree Loops

Spanning Tree Protocol (STP) loops can cause serious performance issues that might appear to be portor interface problems. In this situation, the switch bandwidth is used repeatedly by the same frames,crowding out legitimate traffic.

A unidirectional link can cause loops. This occurs when the traffic that the switch sends is received by

its neighbor, but the switch does not receive the traffic that is sent from the neighbor. A brokenfiber-optic cable, other cabling, or a port issue could cause this one-way communication.

You can enable the UniDirectional Link Detection (UDLD) protocol on the switch to help identifydifficult-to-find unidirectional link problems. UDLD supports a normal mode of operation (the default)and an aggressive mode. In normal mode, UDLD detects unidirectional links because of incorrectlyconnected interfaces on fiber-optic connections. In aggressive mode, UDLD also detects unidirectionallinks caused by one-way traffic on fiber-optic and twisted-pair links and by incorrectly connectedinterfaces on fiber-optic links. For information about enabling UDLD on the switch, see theUnderstanding UDLD section in the software configuration guide.

Monitor Switch PerformanceReview these sections when you troubleshoot switch performance problems:

Speed, Duplex, and Autonegotiation, page 4-4

Autonegotiation and NIC Cards, page 4-5

Cabling Distance, page 4-5

Speed, Duplex, and Autonegotiation

If the port statistics show a large number of alignment errors, frame check sequence (FCS), orlate-collisions errors, a speed or duplex mismatch might be the problem.

A common issue with speed and duplex occurs when the duplex settings are mismatched between twoswitches, between a switch and a router, or between the switch and a workstation or server. This canhappen when you manually set the speed and duplex or because of autonegotiation issues between thetwo devices.

These circumstances can result in a mismatch:

A manually set speed or duplex parameter is different from the manually set speed or duplexparameter on the connected port.

A port is set to autonegotiate, and the connected port is set to full duplex with no autonegotiation.


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To maximize switch performance and to ensure a link, follow one of these guidelines when you set orchange the settings for duplex and speed:

Let both ports autonegotiate both speed and duplex.

Manually set the speed and duplex parameters for the ports on both ends of the connection.

If a remote device does not autonegotiate, configure the duplex settings on the two ports to match.The speed parameter

375 Hard Install

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