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This chapter provides these topics that describe the Catalyst 2955 switch, hereafter referred to as the switch.
The Catalyst 2955 switch is a member of the Catalyst switch family. Catalyst switches are a series of Ethernet switches that you can use to connect workstations and other Ethernet-enabled devices.
The Catalyst 2955 switch is an Ethernet switch that mounts on a DIN rail in an industrial enclosure as well as in a standard 19-inch rack. Its components are designed to withstand extremes in temperature, vibration, and shock so that the switch can be deployed in an industrial environment.
Refer to the switch software configuration guide for examples that show how you might deploy the switches in your network.
Figure 1-1 through Figure 1-3 show the Catalyst 2955 switches.
These are the switch features:
The switch front panel contains the ports, the LEDs, and the power and relay cable connector.
Figure 1-1 to Figure 1-3 show the switch front panels.
The laser safety warning label (as shown in Figure 1-4) appears on the Catalyst 2955C-12 and Catalyst 2955S-12 switch front panels. The MM fiber-optic ports on the Catalyst 2955C-12 are Class 1 LEDs. The SM fiber-optic uplink ports on the Catalyst 2955S-12 are Class 1 Laser products.
The laser safety warning label means that you should exercise caution when working with fiber-optic ports and cabling. See "Translated Safety Warnings" for more information about laser safety guidelines.
The hot surface warning label (as shown in Figure 1-5) appears on the Catalyst 2955C-12, Catalyst 2955S-12 and Catalyst 2955T-12 switch front panels. This label means that the surface of the switch is a hot surface. See "Translated Safety Warnings" for more information about proper handling guidelines for hot surfaces.
The 10/100 ports use RJ-45 connectors and twisted-pair cabling. The ports can connect to these devices:
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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 "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.
The 10/100/1000 uplink ports on the Catalyst 2955T-12 switch use RJ-45 connectors and twisted-pair cabling. The ports can connect to these devices:
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Note When connecting the switch to a 1000BASE-T device, be sure to use a four twisted-pair, Category 5 cable. |
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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 "Connectors and Cables." |
The 10/100/1000 ports on the Catalyst 2955T-12 switch can be explicitly set to operate at 10, 100, or 1000 Mbps but only in full-duplex mode. They 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).
The 100BASE-FX ports on the Catalyst 2955C-12 use 50/125- or 62.5/125-micron MM fiber-optic cabling. In full-duplex mode, the MM fiber-optic cable length from a switch to an attached device cannot exceed 6562 feet (2 kilometers).
For MM connections, you can connect a 100BASE-FX port to a port on a target device by using one of the MT-RJ fiber-optic patch cables listed in Table B-1. Use the Cisco part numbers in Table B-1 to order the patch cables that you need.
The 100BASE-LX ports on the Catalyst 2955S-12 use 9/125-micron SM fiber-optic cabling. The cable length from a switch to an attached device cannot exceed 9.375 miles (15 kilometers).
For SM connections, use one of the different connectors listed in Table B-2. Use the Cisco part numbers in Table B-2 to order the connectors that you need.
The power and relay connector gives DC power and configurable alarm contacts to the switch. The power and relay connector is on the right of the uplink ports on the faceplate, as shown in Figure 1-6.
The connector is a pluggable screw terminal block connector that gives power and return connections for both the primary and secondary power supplies. The positive DC power input for power supply A is labeled 24V A, and the return for power supply A is labeled RTN A. For power supply B (the redundant power supply), the positive DC power input is labeled 24V B, and the return is labeled RTN B. The Catalyst 2955 switch can operate with a single power supply or with dual power supplies. In dual-power mode, the switch draws power from the power supply with higher voltage. In case the primary power supply fails in dual power mode, the alternate power supply gives power to the switch.
The power and relay connector gives the Catalyst 2955 switch the interfaces to two independent alarm relays. The relays can be triggered by alarms for environmental, power supply, and port status conditions. The relays can be configured to send a fault signal to an external alarm device, such as a bell or a light. You can use the CLI to associate any alarm condition with either alarm relay or both relays.
The alarm relays on the Catalyst 2955 switch are normally open (NO). To connect an external alarm device to the relays, you must connect two relay contact wires to complete an electrical circuit. Because each external alarm device requires two connections to a relay, the Catalyst 2955 switch supports a maximum of two external alarm devices.
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Note Refer to the switch configuration guide for instructions on how to configure the alarm relays. |
For more information about the power and relay connector, see "Connectors and Cables."
You can connect a switch to a PC through the console port and the supplied 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.
You can use the LEDs to monitor switch activity and performance. The LEDs on all Catalyst 2955 switches are on the bottom edge of the front panel. The LEDs are visible in both face-up and parallel mounting configurations, as shown in Figure 1-7 and Figure 1-8.
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Note The 10/100 port status LEDs show port status only. |
All of the LEDs described in this section are visible in the Cluster Management Suite (CMS). The switch software configuration guide describes how to use CMS to configure and to monitor individual switches and switch clusters.
The Catalyst 2955 switch can operate with a single power supply or with dual power supplies. In dual-power mode, the switch draws power from the power supply with higher voltage. In case the primary power supply fails in dual power mode, the alternate power supply gives power to the switch.
The power status LEDs show whether the individual power supplies are receiving power and functioning properly. Table 1-1 lists the LED colors and meanings.
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Note The power status LEDs show that power is not present on the switch if the power
input drops below 17 V. The power status LEDs only show that power is present
if the input exceeds 18.5 V. The 1.5 V difference, or hysteresis, ensures that the
power status LEDs do not oscillate at values near 18 V. In dual power mode, the power status LEDs show status for both power inputs, 24 VA and 24 VB. |
| Color | System Status |
|---|---|
For information about the power LED colors during the power-on self-test (POST), see the "Powering On the Switch and Running POST" section.
Each 10/100 port has a port status LED, also called a port LED, as shown in Figure 1-7 and Figure 1-8. These LEDs display information about the switch and the individual ports, as shown in Table 1-2.
Table 1-2 10/100 Port Status LEDs
The Catalyst 2955 switch has two uplink port status LEDs to the right of the port status LEDs. On the Catalyst 2955C-12 and Catalyst 2955S-12 switches, the fiber-optic uplink port status LEDs are labeled 13 and 14 (see Figure 1-8). On the Catalyst 2955T-12, the 10/100/1000BASE-T uplink ports are labeled 1 and 2 (see Figure 1-7).
These LEDs display information about the switch and the individual uplink ports, as shown in Table 1-3, Table 1-4, and Table 1-5.
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Note The uplink port status LEDs provide system and status information during POST. See the "Powering On the Switch and Running POST" section for more information about uplink port LED colors during POST. |
Two alarm and relay LEDs labeled MAJ and MIN are to the right of the uplink port status LEDs, as shown in Figure 1-7 and Figure 1-8. These LEDs reflect the state of the major and minor system alarms.
You can use Cisco IOS command line interface (CLI) to configure the major and minor LEDs to drive the relay contacts, so that the connected external alarm device state mirrors the alarm state indicated by the major (MAJ) or minor (MIN) LED. You can also use the CLI to associate port and global status alarms to one or both relays. Refer to the switch software configuration guide for details.
Table 1-6 lists the LED colors and meanings.
Table 1-6 Alarm and Relay LEDs
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Note The minor LED is disabled by default. |
The rear panel of the Catalyst 2955 switch has a DIN rail mounting clip assembly, as shown in Figure 1-9.
The switch ships with the clip assembly installed on the rear panel, for a parallel mounting configuration. To mount the switch in a face-down configuration, remove the clip assembly from the rear panel, and then install it on the top of the switch.
Catalyst 2955 switches offer these management options:
CMS is made up of three web-based applications that you can use to manage switches. You can use Cluster Builder, which includes Cluster View, and Cluster Manager to create, configure, and monitor switch clusters. You can also use Device Manager to manage individual and standalone switches. For more information, refer to the switch software configuration guide and the CMS online help.
You can manage switches by using command-line entries. To access the CLI, connect a PC or 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, refer to the switch command reference.
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, refer to the documentation that came with your CiscoView application.
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, refer to the documentation that came with your SNMP application.
Posted: Fri Apr 25 20:22:15 PDT 2003
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