Contents
v
Cisco CGS 2520 Hardware Installation Guide
OL-31444-01
C H A P T E R
4
Troubleshooting
4-1
Diagnosing Problems
4-1
Switch POST Results
4-1
Switch LEDs
4-1
Switch Connections
4-2
Bad or Damaged Cable
4-2
Ethernet and Fiber-Optic Cables
4-2
Link Status
4-2
10/100 and 10/100/1000 Port Connections
4-3
10/100 PoE+ Port Connections
4-3
SFP Module
4-3
Interface Settings
4-4
Ping End Device
4-4
Spanning Tree Loops
4-4
Switch Performance
4-4
Speed, Duplex, and Auto-Negotiation
4-4
Auto-Negotiation and Network Interface Cards
4-5
Cabling Distance
4-5
Resetting the Switch to the Factory Default Settings
4-6
Finding the Switch Serial Number
4-6
A P P E N D I X
A
Technical Specifications
A-1
Switch Specifications
A-1
Power Supply Module Specifications
A-4
A P P E N D I X
B
Connector and Cable Specifications
B-1
Connector Specifications
B-1
10/100 Ethernet Ports
B-1
SFP Module Connectors
B-2
Dual-Purpose Ports
B-3
Alarm Port
B-3
Alarm Ratings
B-3
Cables and Adapters
B-4
SFP Module Cables
B-4
Cable Pinouts
B-6
Console Port Adapter Pinouts
B-8