Table of Contents
Product Overview
Product Overview
This chapter provides an overview of the Catalyst 4908G-L3 switch router and contains the following sections:
The Catalyst 4908G-L3 switch router (see Figure 1-1) is a standalone, fixed configuration, multiprotocol 10/100/1000 Ethernet switch. The Catalyst 4908G-L3 switch router is designed for high-performance, high-density wiring-closet applications, such as CiscoWorks for Switched Internetworks (CWSI).
Figure 1-1: Catalyst 4908G-L3 Switch Router
Switch Router Ports
The following sections describe the switch router ports:
Gigabit Ethernet Ports
- 1000BASE-SX (short wavelength)
- 1000BASE-LX/LH (long wavelength/long haul)
- 1000BASE-ZX (extended distance)
Management Ports
The switch router has two management ports: console port and auxiliary port.
The console port provides local system management using standard console equipment. (See Figure 1-2.) See Table A-2 for a list of console port pinouts.
The auxiliary port supports remote console interfaces using a modem. (See Figure 1-2.) This port is for network management only and is not a switching port. There is no connectivity between this port and the Gigabit Ethernet ports. See Table A-3 for a list of auxiliary port pinouts.
Figure 1-2: Catalyst 4908G-L3 Console Port and Auxiliary Port
LEDs
The LEDs on the front panel of the switch router perform the following functions:
- STATUS LED indicates the operating state of the switch router.
- Link status LEDs indicates the port status of the Gigabit Ethernet.
- PS1 LED indicates the status of the internal power supply.
- RPS LED indicates the status of the external redundant power supply.
The STATUS LED is located at the bottom left of the front panel. The eight Gigabit Ethernet ports are numbered 1 through 8 and have a link status LED below each port. Figure 1-3 and Figure 1-4 show the location of the LEDs on the front panel. See Table 1-1 for LED descriptions.
Figure 1-3: Catalyst 4908G-L3 Port Numbering and LEDs
The PS1 and RPS LEDs are near the auxiliary and console ports at the far right of the front panel. (See Figure 1-4.)
Figure 1-4: Catalyst 4908G-L3 Gigabit Ethernet Ports and LEDs
Table 1-1 describes the LEDs.
Table 1-1: LED Descriptions
| LED | State | Description |
|---|---|---|
|
STATUS |
Green |
The switch router performs a series of self-test diagnostics. All tests pass. |
|
Link status |
Green |
Operational. |
|
PS1 |
Green |
Operational. |
|
RPS |
Green |
Operational. |
Fan Assembly
The 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 of the chassis. (See Figure 1-5.)
Figure 1-5: Catalyst 4908G-L3 Internal Airflow
If an individual fan fails, the other fans continue to run. Sensors monitor the internal air temperature. If the air temperature exceeds a desired threshold, the environmental monitor displays warning messages on the console.
Power Supplies
Each power supply has an individual power cord and status LEDs (PS1 and RPS). There is no power switch on the Catalyst 4908G-L3 switch router; power is available in the power supply when the power cord is plugged in. See Table A-1 for complete power specifications.
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 provides the load-sharing capabilities of the RPS. |
 |
Note When using the internal power supply, the RPS is connected and turned on; however, it remains idle unless it is needed. If the internal power supply fails, the RPS provides power to the switch router. The transition causes a power cycle and an automatic system reset. |
You can maintain normal system operation by resolving adverse environmental conditions before the loss of operation by using the environmental monitoring and reporting functions of the power supplies.