Product Overview

The Catalyst 2948G-L3 switch router is a standalone, fixed configuration, multiprotocol 10/100/1000 Ethernet switch. The Catalyst 2948G-L3 switch router is designed for high-performance, high-density wiring closet applications, such as CiscoWorks for Switched Internetworks. This chapter provides an overview of the Catalyst 2948G-L3 switch router. (See Figure 1-1.)

Figure 1-1: Catalyst 2948G-L3 Switch Router

The Catalyst 2948G-L3 switch router can connect to networking equipment at three different Ethernet speeds:

The Ethernet (10BaseT) interface is for workstations and repeaters.
The Fast Ethernet (100BaseT) interface is for workstations, servers, switches,
and routers.
The Gigabit Ethernet (1000BaseX) interface is primarily for backbone interconnection of high-performance switches and routers.

The Catalyst 2948G-L3 switch router's high-density 10/100BaseT switching enables cost-effective deployment to the desktop. Autonegotiation of link speed on each 10/100 port allows migration to 100BaseT from a 10BaseT installed base.

Catalyst 2948G-L3 Switch Router Components

This section describes the Catalyst 2948G-L3 switch router hardware components.

Switching Ports

The 48, high-density 10/100BaseT Fast Ethernet autoconfiguring fixed ports enable cost-effective deployment to the desktop. Autonegotiation of link speed on each 10/100 port allows migration to 100BaseT from a 10BaseT installed base.

Gigabit Ethernet Ports

Two 802.3z Gigabit Ethernet ports with modular GBIC interfaces can be independently configured with the following GBIC modules:

1000BaseSX (Short wavelength)
1000BaseLX/LH (Long wavelength/long haul)
1000BASE-ZX (Extended distance)

The Catalyst 2948G-L3 switch router's high-speed Gigabit switching ports provide a migration path to the third generation of Ethernet technologies.

Management Ports

A console serial port (RJ-45) provides system management using standard console equipment. See Table A-2 for a list of console port pinouts.

The auxiliary port supports remote console interfaces. This port is for network management only. This port is not a switching port. There is no connectivity between this port and the 10/100BaseT switching ports. See Table A-3 for a list of auxiliary
port pinouts.

Front Panel LEDs

The LEDs on the front panel of the Catalyst 2948G-L3 switch router perform the following functions:

Status LEDs indicate the operating state of the Catalyst 2948G-L3 switch router
Link status LEDs indicate the switching port status
PS1 LED indicates the internal power supply status
RPSU LED indicates the external redundant power supply unit status

The 10/100BaseT ports are configured in vertical pairs. The top ports are odd-numbered ports (1 through 47) and the bottom ports are even-numbered ports (2 through 48). (See Figure 1-2.) Each vertical pair of 10/100BaseT ports has two link status LEDs below it. The LED on the left is for the top port and the LED on the right is for the bottom port. For example, LED 1 is for the upper port (port 1) and LED 2 is for the bottom port (port 2).

Figure 1-2: Catalyst 2948G-L3 Port Numbering and LED s

Two Gigabit Ethernet ports are at the far right of the front panel. (See Figure 1-3.) Port 49 is the top port; port 50 is the bottom port. The two link status LEDs for these ports are below port 50. The LEDs are labeled to the corresponding port number.

Figure 1-3: Catalyst 2948G-L3 Gigabit Ethernet Ports and LEDs

Table 1-1 describes the LEDs.

LED	State	Description
Status	Green Red Orange Off	The Catalyst 2948G-L3 switch router performs a series of self-test diagnostics: All tests pass A test other than an individual port test fails Switch boot or diagnostic tests in progress Switch is disabled
Link status	Green Orange Flashing orange Off	The 100BaseT is in use The 10BaseT is in use Power-on self-test indicates faulty port No signal detected, or link configuration failure
PS1 and RPSU	Green Red	Operational Failure

Table 1-1: LED Descriptions

LED State Description

Status

Green
Red
Orange
Off

The Catalyst 2948G-L3 switch router performs a series of self-test diagnostics:
All tests pass
A test other than an individual port test fails
Switch boot or diagnostic tests in progress
Switch is disabled

Link status

Green
Orange
Flashing orange
Off

The 100BaseT is in use
The 10BaseT is in use
Power-on self-test indicates faulty port
No signal detected, or link configuration failure

PS1 and RPSU

Green
Red

Operational
Failure

Chassis Cooling

The switch router's fan assembly provides cooling air for the internal chassis components. The fans exhaust air from the rear and fresh air is drawn in from the left, right, and front.
(See Figure 1-4.)

Figure 1-4: Catalyst 2948G-L3 Internal Airflow

If an individual fan fails, the other fan(s) continues to run. Sensors monitor the internal air temperatures. If the air temperature exceeds a desired threshold, the environmental monitor displays warning messages.

Power Sup plies

The Catalyst 2948G-L3 switch router has an internal power supply and supports a second, external redundant power supply unit (RPS). To order a Cisco RPS for a Catalyst 2948G-L3 switch router, consult the Cisco Product Catalog.

Each power supply has an individual power cord and status LEDs (PS1 and RPSU). The Catalyst 2948G-L3 switch router and the RPS use power cords to connect to the site power source. There is no power on switch on the Catalyst 2948G-L3 switch router; AC power is present in the supply when the power cord is plugged in. See Table A-1 for complete power specifications for the Catalyst 2948G-L3 switch router.

The RPS has two power cords and two power switches. When operating from the RPS, both power switches on the RPS must be on for power supply redundancy.

Caution Use only the y-cable to connect the switch to the RPS. The y-cable ensures use of the load sharing capabilities of the RPS.

Note If the internal power supply fails, the RPS output is enabled. The transition causes a power cycle and an automatic system reset.

Note When using the internal power supply, the RPS is connected and turned on; however, it remains idle unless it is needed.

Environmental Monitoring of the Power Supplies

Using the environmental monitoring and reporting functions, you can maintain normal system operation by resolving adverse environmental conditions prior to loss of operation.

Each power supply monitors its own temperature and output voltages. If conditions reach critical thresholds, the power supply might shut down to avoid damage from excessive heat or electrical current. The Catalyst 2948G-L3 switch router senses the operating condition of the power supply and reports status through the LEDs.

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Product Overview