Table Of Contents
STAT, DPLX, SPD, and Port LEDs
Overview
This chapter provides information about these topics:
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 "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:
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Hardware
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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
Port Numbering
Table 1-1 lists the port and slot numbering for the Catalyst 2940 switches.
Table 1-1 Port and Slot Numbering
10/100 Ethernet
1 through 8
1 through 8
Gigabit Ethernet 10/100/1000
1
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100BASE-FX
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9
SFP module
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1
10/100 Ports
The 10/100 ports use RJ-45 connectors and twisted-pair cabling. The ports can connect to these devices:
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Note
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:
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Note
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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
If you install an SFP module after the switch has powered on, you must reload the switch to enable the SFP module.
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:
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Note
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.
Table 1-3 Cabling Stipulations for Fiber-Optic SFP Modules
SX
275 m2 at
200 Mhz-km550 m at
500 Mhz-km—
LX
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550 m at
500 Mhz-km550 m at
400 Mhz-km10 km
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CWDM3
1470, 1490, 1510, 1530, 1550, 1570, 1590, 1610
SMF
9/125
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62 miles (100 km)
1470, 1490, 1510, 1530, 1550, 1570, 1590, 1610
1 nm = nanometer
2 m = meter
3 CWDM = Coarse Wavelength-Division Multiplexing
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 SFP module 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.
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:
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:
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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.
Table 1-4 System LED
Off
System is not powered on.
Green
System is operating normally.
Amber
System is receiving power but is not functioning properly.
For information about the system LED colors during the power-on self-test (POST), see the "Understanding POST Results" section.
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.
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.
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.
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.
Management Options
Catalyst 2940 switches offer these management options:
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The Network Assistant is a GUI-based application that you can install and run on your desktop; you do not need a web browser to run it. You can use Network Assistant to manage and monitor switch clusters or standalone devices. For more information, see the Getting Started with Cisco Network Assistant guide and the Network Assistant online help.
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You can use the device manager, which is in the switch memory, to manage individual and standalone switches. The device manager is accessible after you have run the Express Setup program (see the getting started guide for more information about running Express Setup). Use the device manager to perform basic switch configuration and monitoring. You can access the device manager from anywhere in your network through a web browser.
To launch the device manager, enter the switch IP address in the web browser, and press Enter. The device manager page appears.
See the device manager online help for more information.
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You can manage switches by using command-line entries. To access the CLI, connect a PC or a terminal directly to the console port on the switch. If the switch is attached to your network, you can use a Telnet connection to manage the switch from a remote location. For more information about the CLI, see the switch command reference.
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You can use the CiscoView device-management application to set configuration parameters and to view switch status and performance information. This application, which you purchase separately, can be a standalone application or part of an Simple Network Management Protocol (SNMP) network-management platform. For more information, see the documentation that came with your CiscoView application.
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You can manage switches by using an SNMP-compatible management station running platforms such as HP OpenView and SunNet Manager. The switch supports a comprehensive set of MIB extensions and MIB II, the IEEE 802.1D bridge MIB, and four Remote Monitoring (RMON) groups. For more information, see the documentation that came with your SNMP application.
