Cisco WS-C2940-8TT-S User Manual

3-4
Catalyst 2940 Switch Hardware Installation Guide
OL-6157-01
Chapter 3 Troubleshooting
Diagnosing Common Problems
Table 3-2 Poor Performance Problems and Their Solutions
Symptom Possible Cause Resolution
Poor performance or excessive
errors.
Duplex autonegotiation
mismatch.
See the switch software
configuration guide for
information about identifying
autonegotiation mismatches.
Cabling distance exceeded.
• Port statistics show
excessive frame check
sequence (FCS),
late-collision, or alignment
errors.
• See the switch software
configuration guide for
information about
displaying port statistics.
• For 10BASE-T,
100BASE-TX, and
1000BASE-T connections:
– The distance between
the port and the attached
device exceeds 328 feet
(100 meters).
• Reduce cable length to
within the recommended
distances.
– If the switch is attached
to a repeater, the total
distance between the
two end stations
exceeds the cabling
guidelines.
• See your repeater
documentation for cabling
guidelines.
• For SFP module
connections: The distance
between the SFP module
and the attached device
exceeds the SFP cabling
guidelines.
• See Table 1-3 for cabling
guidelines.
Bad adapter in attached
device.
• Excessive errors found in
port statistics.
• Run adapter card diagnostic
utility.
• Spanning Tree Protocol
(STP) is checking for
possible loops.
• Wait 30 seconds for port
status LED to turn green.

Cisco WS-C2940-8TT-S Specifications

General

Brand	Cisco
Model	WS-C2940-8TT-S
Category	Switch
Language	English

Summary

Chapter 1 Overview

Setting up the Switch Guide

Guide to initial switch setup using Express Setup or CLI.

Switch Features Overview

Details the hardware capabilities of Catalyst 2940 switch models.

Front-Panel Description

Describes the ports, LEDs, and Mode button on the switch front.

Port Numbering Details

Details the port and slot numbering for Catalyst 2940 switches.

SFP Modules Supported

Details supported SFP modules, fiber-optic connections, and stipulations.

Rear-Panel Description

Describes the AC power connector and console port on the switch rear.

Management Options Summary

Overview of managing the switch: Network Assistant, Device Manager, CLI, etc.

Chapter 2 Installation

Preparing for Installation Steps

Information and steps required before installing the switch.

Installing the Switch Methods

Procedures for mounting the switch in various locations.

Connecting to SFP Module

Instructions for connecting cables to an SFP module.

Connecting to 10/100 & 10/1000 Ports

Steps to connect devices to 10/100 and 10/1000 ports via Ethernet.

Connecting to 100BASE-FX Port

Steps to connect the 100BASE-FX port to a device using fiber-optic cables.

Connecting to SFP Module Port

Steps to connect fiber-optic cables to an SFP module port.

Chapter 3 Troubleshooting

Understanding POST Results

Interpreting Power-On Self-Test (POST) results and failure indicators.

Diagnosing Common Switch Problems

Categorizes and provides solutions for common switch issues.

Appendix A Technical Specifications

Appendix B Connectors and Cables

Appendix C CLI Configuration

Accessing the Switch CLI

Methods for accessing the Command Line Interface (CLI) for switch setup.

CLI Access via Console Port

Steps to access CLI through the console port connection.

Connecting to a Power Source

Steps to connect the switch to an AC power source and outlet.

Connecting to the Console Port

Steps to connect the switch console port to a PC using the adapter cable.

Starting Terminal Emulation Software

Instructions for starting terminal emulation software for switch communication.

Entering Initial Configuration Information

Setting baud rate, data bits, stop bits, parity, and flow control.

Configuring IP Settings

Required network information (IP address, subnet mask, gateway) for switch setup.

Completing the Setup Program

Steps to set hostname, passwords, SNMP, and interface IP/subnet mask.