Cisco Catalyst Series Switch 2940 Guía de instalación

CHAPTER

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Overview

This chapter provides information about these topics:

•Setting up the Switch, page 1-1

•Features, page 1-1

•Front-Panel Description, page 1-2

•Rear-Panel Description, page 1-9

•Management Options, page 1-11

Setting up the Switch

See the Catalyst 2940 Switch Getting Started Guide for instructions on initially configuring your

Catalyst switch by using the Express Setup. Also covered in the getting started guide are switch

management options, basic rack-mounting procedures, port and module connections, power connection

procedures, and troubleshooting help. For instructions on setting up your switch by using the

command-line interface (CLI), see Appendix C, “Configuring the Switch with the CLI-Based

Setup Program.”

Features

The Catalyst 2940 switches are a family of Ethernet switches that you can use to connect workstations

and other network devices, such as servers, routers, and other switches. All models of the switch are

cluster-capable.

See the switch software configuration guide for examples that show how you might deploy the switches

in your network.

These are the switch features:

•Hardware

–

Catalyst 2940-8TT-S switch—Eight 10/100 Ethernet ports and one Gigabit Ethernet

10/100/1000 port.

–

Catalyst 2940-8TF-S switch—Eight 10/100 Ethernet ports, one 100BASE-FX port, and one

small-form-factor pluggable (SFP) module slot. The Cisco SFP modules that are supported by

this switch include the1000BASE-LX, 1000BASE-SX, Coarse Wavelength Division

Multiplexing (CDWM) fiber-optic modules, and the 1000BASE-T copper module.

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Chapter 1 Overview

Front-Panel Description

•Configuration

–

Supports manual and autoconfiguration for 10/100 ports

–

Supports manual configuration at 10 or 100 Mbps for 10/100/1000 port (full duplex only at

1000 Mbps)

–

Supports only 100 Mbps and full duplex for 100BASE-FX port

–

Supports 8192 MAC addresses

–

Checks for errors on a received packet, determines the destination port, stores the packet in

shared memory, and then forwards the packet to the destination port

Front-Panel Description

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

Figure 1-1 and Figure 1-2 show the switches.

Figure 1-1 Catalyst 2940-8TT-S Switch

Figure 1-2 Catalyst 2940-8TF-S Switch

110/100 Ethernet ports

210/100/1000 Gigabit Ethernet port

89451

1x 2x 3x 4x 5x 6x 7x 8x

Catalyst 2940

SERIES

SYST

STAT

DPLX

SPD

MODE

110/100 Ethernet ports

2100BASE-FX port

3SFP module slot

89452

100Base-FX SFP

1x 2x 3x 4x 5x 6x 7x 8x

Catalyst 2940

SERIES

SYST

STAT

DPLX

SPD

MODE

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Chapter 1 Overview Front-Panel Description

Port Numbering

Table 1-1 lists the port and slot numbering for the Catalyst 2940 switches.

10/100 Ports

The 10/100 ports use RJ-45 connectors and twisted-pair cabling. The ports can connect to these devices:

•10BASE-T devices, such as workstations and hubs, through standard RJ-45 connectors and two

twisted-pair cabling. You can use Category 3, 4, or 5 cabling.

•100BASE-TX 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 cabling.

Note When connecting the switch to workstations, servers, and routers, be sure that the cable is a twisted-pair

straight-through cable. When connecting the switch to hubs or other switches, use a twisted-pair

crossover cable. Pinouts for the cables are described in Appendix B, “Connectors and Cables.”

The 10/100 ports can be explicitly set to operate in any combination of half duplex, full duplex, 10 Mbps,

or 100 Mbps. They can also be set for speed 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).

When set for autonegotiation, a port senses the speed and duplex settings of the attached device and

advertises its own capabilities. If the attached device supports autonegotiation, the port negotiates the

best connection (that is, the fastest line speed that both devices support and full-duplex transmission, if

the attached device supports it) and configures itself accordingly.

10/100/1000 Port

The 10/100/1000 port on the Catalyst 2940-8TT-S switch uses RJ-45 connectors and twisted-pair

cabling. The port can connect to these devices:

•10BASE-T devices, such as workstations and hubs, through standard RJ-45 connectors and two or

four twisted-pair, Category 5 cabling.

•100BASE-TX 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 cabling.

•1000BASE-T devices, such as high-speed workstations, servers, hubs, routers, and other switches,

through standard RJ-45 connectors and four twisted-pair, Category 5 cabling.

Table 1-1 Port and Slot Numbering

Port or Slot type Catalyst 2940-8TT-S Catalyst 2940-8TF-S

10/100 Ethernet 1 through 8 1 through 8

Gigabit Ethernet

10/100/1000 1—

100BASE-FX — 9

SFP module — 1

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Chapter 1 Overview

Front-Panel Description

Note When connecting the switch to a 1000BASE-T device, be sure to use a four twisted-pair, Category 5

cable.

Note When connecting the switch to workstations, servers, and routers, be sure to use a twisted-pair

straight-through cable. When connecting the switch to hubs or other switches, use a twisted-pair

crossover cable. Pinouts for the cables are described in Appendix B, “Connectors and Cables.”

The 10/100/1000 port on the Catalyst 2940-8TT-S switch can be explicitly set to operate at full- or

half-duplex at 10 or 100 Mbps. The port is restricted to full-duplex mode when it is set at 1000 Mbps.

The port can also be set for speed 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).

100BASE-FX Port

The 100BASE-FX port on the Catalyst 2940-8TF-S switch can use either 50/125- or 62.5/125-micron

multimode fiber-optic cabling. The 100BASE-FX port operates only at 100 Mbps in full-duplex mode.

In full-duplex mode, the cable length from the 100BASE-FX port to an attached device cannot exceed

6562 feet (2 kilometers).

You can use only the 100BASE-FX port or the SFP module slot at one time. When the switch is first

powered on, the 100BASE-FX port is enabled by default. However, if an SFP module is already installed

in the switch, the SFP module slot is enabled.

You can connect the 100BASE-FX port to an SC port on a target 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 patch

cables that you need.

SFP Module Slot

The SFP module slot supports copper or fiber-optic SFP modules. The SFP module slot is numbered as

port 1.

Note You can use only the SFP module slot or the 100BASE-FX port at one time. When the switch is first

powered on, the 100BASE-FX port is enabled by default. However, if an SFP module is already installed

in the switch, the SFP module slot is enabled.

If you install an SFP module after the switch has powered on, you must reload the switch to enable the

SFP module.

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

Type 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=

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Chapter 1 Overview Front-Panel Description

SFP Modules

The Catalyst 2940-8TF-S switch uses a field-replaceable SFP module to establish Gigabit connections.

You insert an SFP module into the SFP module slot on the front of the switch.

The Cisco SFP modules that are supported by the Catalyst 2940-8TF-S switch include:

•1000BASE-LX, fiber-optic

•1000BASE-SX, fiber-optic

•1000BASE-T, copper

•Coarse Wavelength-Division Multiplexing (CDWM), fiber-optic

Note The Catalyst 2940-8TF-S switch only supports 1000 Mbps and full-duplex modes on SFP modules.

The 1000BASE-LX and 1000BASE-SX SFP modules are used to establish fiber-optic connections. You

use fiber-optic cables with LC connectors to connect to an SFP module. The SFP modules support 850

to 1550 nm nominal wavelengths. These field-replaceable modules provide the uplink optical interfaces,

laser send (TX), and laser receive (RX).

The restrictions are that each port must match the wave-length specifications on the other end of the

cable, and the cable must not exceed the stipulated cable length for reliable communications. Table 1-3

lists these stipulations.

The 1000BASE-T SFP module is used to establish a Gigabit Ethernet connection through a Category 5

(copper) cable. This module can provide a Gigabit Ethernet connection of up to 100 meters through a

Category 5 cable.

Use only Cisco SFP modules on the Catalyst 2940-8TF-S switch. Each SFPmodule has an internal serial

EEPROM that is encoded with security information. This encoding provides a way for Cisco to identify

and validate that the SFP module meets the requirements for the switch.

Table 1-3 Cabling Stipulations for Fiber-Optic SFP Modules

SFP

Module

62.5/125 micron

Multimode

850 nm1Fiber

1. nm = nanometer

50/125 micron

Multimode

850 nm Fiber

62.5/125 micron

Multimode

1310 nm Fiber

50/125 micron

Multimode

1310 nm Fiber

9/125 micron

Single-mode

1310 nm Fiber

8micron

Single-mode

Dispersion

Shifted Fiber

SX 275 m2at

200 Mhz-km

2. m = meter

550 m at

500 Mhz-km —

LX — — 550 m at

500 Mhz-km 550 m at

400 Mhz-km 10 km —

CWDM3

3. CWDM = Coarse Wavelength-Division Multiplexing

1470,1490,1510,

1530,1550,1570,

1590, 1610

SMF 9/125 — 62 miles (100

km) 1470, 1490,

1510, 1530,

1550, 1570,

1590, 1610

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Front-Panel Description

The Cisco CWDM SFPs operate on single-mode fiber. The SFPs support both Gigabit Ethernet as well

as fiber channel (1 Gigabit and 2 Gigabit) links. For more information about Cisco CWDM SFPs, see

the Cisco CWDM SFP Transceiver Compatibility Matrix at this URL:

http://www.cisco.com/en/US/products/hw/modules/ps4999/products_device_support_table09186a00803bf095.html

Also see your SFP module documentation and the Cisco Small Form-Factor Pluggable Modules

Installation Notes (not orderable but is available on Cisco.com).

For the latest information about SFP modules supported by the switch, see the release notes.

Cable Guard

You can order an optional cable guard to secure cables to the front of the switch and prevent them from

being accidentally removed. To order a cable guard, contact your Cisco representative.

LEDs

There are four LEDs on the left panel of the switch, and there are port status LEDs above all the switch

ports, as shown in Figure 1-3.

Figure 1-3 LEDs on Catalyst 2940 Switches

You can use these LEDs to monitor switch activity and performance:

•The system (SYST) continually displays the system status. The SYST LED color shows the switch

status.

•The status (STAT), duplex (DPLX), and speed (SPD) LEDs show the information that is being

displayed by the port status LEDs. Pressing the Mode button cycles the LEDs through the STAT,

DPLX, and SPD displays.

1Port status LED 4STAT LED

2Mode button 5DPLX LED

3SYST LED 6SPD LED

89453

1x 2x 3x 4x 5x

SYST

STAT

DPLX

SPD

MODE

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Chapter 1 Overview Front-Panel Description

All of the LEDs described in this section are visible through the GUI management applications—the

Network Assistant application for multiple switches and the device manager for a single switch. The

switch software configuration guide describes how to use the CLI to configure and to monitor individual

switches and switch clusters.

SYST LED

The SYST LED shows whether the system is receiving power and functioning properly. Table 1-4 lists

the LED colors and meanings.

For information about the system LED colors during the power-on self-test (POST), see the

“Understanding POST Results” section on page 3-1.

STAT, DPLX, SPD, and Port LEDs

Press the Mode button to cycle through the STAT, DPLX, and SPD LED displays. When the LED is

highlighted for the mode that you want, release the button to enable that highlighted mode.

Table 1-5 lists the mode meanings.

Each port has a port status LED, also called a port LED. These LEDs display information about the

individual ports. When you change the port mode, the meanings of the port LED colors change.

Table 1-6 explains how to interpret these colors.

Table 1-4 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.

Table 1-5 Port Mode LEDs

Mode LED Port Mode Description

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

DPLX Port duplex mode Port duplex mode: half duplex or full duplex.

SPD Port speed Port operating speed: 10 or 100 Mbps for 10/100 ports and

10, 100, or 1000 Mbps for 10/100/1000 ports.

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Chapter 1 Overview

Front-Panel Description

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

Port Mode Color Meaning

STAT Off No link.

Solid green Link present.

Flashing green Activity. Port is sending or receiving data.

Alternating

green-amber Link fault. Error frames can affect connectivity, and errors such as

excessive collisions, CRC errors, and alignment and jabber errors are

monitored for a link-fault indication.

Solid amber Port is not forwarding. Port was disabled by management, an address

violation, or Spanning Tree Protocol (STP).

Note After a port is reconfigured, the port LED can remain amber for

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

DPLX Off Port is operating in half duplex.

(half or

full

duplex)

Green Port is operating in full duplex.

SPD 10/100 ports

Off Port is operating at 10 Mbps.

Green Port is operating at 100 Mbps.

10/100/1000 ports

Off Port is operating at 10 Mbps.

Green Port is operating at 100 Mbps.

Flashing green Port is operating at 1000 Mbps.

SFP modules

Off Port is operating at 10 Mbps.

Green Port is operating at 100 Mbps.

Flashing green Port is operating at 1000 Mbps.

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Chapter 1 Overview Rear-Panel Description

Rear-Panel Description

The rear panel of the switches, as shown in Figure 1-4, have an AC power connector and an RJ-45

console port.

Figure 1-4 Catalyst 2940 Switch Rear Panel

Power Connector

You provide power to a switch by using the AC internal power supply. The internal AC power supply is

an autoranging unit that supports input voltages between 100 and 240 VAC. Use the supplied AC power

cord to connect the AC power connector to an AC power outlet.

The switch accessory kit includes an L-shaped AC power cord. Table 1-7 lists the spare L-shaped AC

power cords that you can order from your Cisco sales representative.

1AC power connector

2RJ-45 console port

89886

Table 1-7 Spare L-Shaped Power Cords

Type Cisco Part Number

110 V CAB-AC-RA=

Argentina CAB-ACR-RA=

Australia, 10 A CAB-ACA-RA=

China CAB-ACC-RA=

Europe CAB-ACE-RA=

Italy CAB-ACI-RA=

Japan CAB-JPN-RA=

Switzerland CAB-ACS-RA=

UK CAB-ACU-RA=

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Chapter 1 Overview

Rear-Panel Description

Console Port

You can connect a switch to a PC through the console port by using a RJ-45-to-DB-9 adapter cable.

If you want to connect a switch to a terminal, you need to provide an RJ-45-to-DB-25 female DTE

adapter. You can order a kit (part number ACS-DSBUASYN=) with that adapter from Cisco.

For console-port and adapter-pinout information, see the “Cable and Adapter Specifications” section on

page B-5.

Security Slots

The switches have security slots in the left and right side panels. You can install an optional cable lock,

such as the type that is used to secure a laptop computer, to secure either or both sides of the switch.

Figure 1-5 shows the slot on a left-side panel.

Figure 1-5 Switch Left Panel

Cable locks are available from most computer accessory suppliers.

1Security slot

93001

Otros manuales para Catalyst Series Switch 2940

Tabla de contenidos

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Cisco Catalyst X5234 Manual de operación y mantenimiento

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