Cisco Systems 2940 User Manual

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 instructio ns on settin g up your swi tch by using the command-line interface (CLI), see Appendix C, “Configuring the Switch with the CLI-Based

Setup Program.”

CHAPTER

Features

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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 configur at ion g uide for examples that show how you might deploy the switch es 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.

Catalyst 2940 Switch Hardware Installation Guide

1-1

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

Chapter 1 Overview

SYST STAT

DPLX SPD

MODE

1 10/100 Ethernet ports 2 10/100/1000 Gigabit Ethernet port

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

SYST STAT

DPLX

SPD

MODE

100Base-FX

SFP

Catalyst 2940

SERIES

89451

SERIES

89452

1-2

1 10/100 Ethernet ports 2 100BASE-FX port 3 SFP module slot

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Chapter 1 Overview

Port Numbering

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

Table 1-1 Port and Slot Numbering

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

10/100 Ethernet 1 throug h 8 1 through 8 Gigabit Ethernet

10/100/1000 100BASE-FX — 9 SFP module — 1

10/100 Ports

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

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

Front-Panel Description

1—

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,

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 dup lex, 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

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

four twisted-pair, Category 5 cabling.

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• 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.

Catalyst 2940 Switch Hardware Installation Guide

1-3

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 wi th 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).

Chapter 1 Overview

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 b y default. Howe v er , 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.

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=

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 b y default. Howe v er , if an SFP module is already installed in the switch, the SFP module slot is enabled.

1-4

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

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