Cisco CATALYST 2960 - Long-Distance, High-Bandwidth Transport Configuration; Figure 1-5 shows a configuration for sending 8 Gigabits of data over a single fiber-optic cable. The Catalyst 2960, 2960-S or 2960-C switches have coarse wavelength-division multiplexing (CWDM) fiber-optic SFP modules installed. Depending on the CWDM SFP module, data is sent at wavelengths from 1470 to 1610 nm. The higher the wavelength, the farther the transmission can travel. A common wavelength used for long-distance transmissions is 1550 nm.

CHAPTER
4-1
Catalyst 2960 Switch Hardware Installation Guide
OL-7075-09
4
Troubleshooting
The LEDs on the front panel provide troubleshooting information about the switch. They show failures
in the power-on self-test (POST), port-connectivity problems, and overall switch performance. For a full
description of the switch LEDs, see the “LEDs” section on page 1-14.
You can also get statistics from the browser interface, from the command-line interface (CLI), or from
a Simple Network Management Protocol (SNMP) workstation. See the software configuration guide, the
switch command reference guide on Cisco.com, or the documentation that came with your SNMP
application for details.
This chapter describes these topics for troubleshooting problems:
• Diagnosing Problems, page 4-1
• Clearing the Switch IP Address and Configuration, page 4-5
• Locating the Switch Serial Number, page 4-6
Diagnosing Problems
The LEDs on the front panel provide troubleshooting information about the switch. They show POST
failures, port-connectivity problems, and overall switch performance. You can also get statistics from
the CLI or from an SNMP workstation. See the software configuration guide and the switch command
reference on Cisco.com or the documentation that came with your SNMP application for more
information.
• “Verify Switch POST Results” section on page 4-2
• “Monitor Switch LEDs” section on page 4-2
• “Verify Switch Connections” section on page 4-2
• “Monitor Switch Performance” section on page 4-4