Cisco Systems CGS 2520 manual Auto-Negotiation and Network Interface Cards, Cabling Distance

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Chapter 4 Troubleshooting

Diagnosing Problems

Auto-Negotiation and Network Interface Cards

Problems sometimes occur between the switch and third-party network interface cards (NICs). By default, the switch ports and interfaces autonegotiate. Laptops or other devices are commonly set to autonegotiate, yet sometimes issues occur.

To troubleshoot auto-negotiation problems, try manually setting both sides of the connection. If this does not solve the problem, there could be a problem with the firmware or software on the NIC. You can resolve this by upgrading the NIC driver to the latest version.

Cabling Distance

If the port statistics show excessive FCS, late-collision, or alignment errors, verify that the cable distance from the switch to the connected device meets the recommended guidelines. See the “Cables and Adapters” section on page B-4.

Cisco CGS 2520 Hardware Installation Guide

	OL-31444-01	4-5

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Contents Cisco CGS 2520 Hardware Installation Guide Page N T E N T S Wall-Mounting Troubleshooting Accessing the CLI Through the Console Port C-1 Preface Related Publications Obtaining Documentation and Submitting a Service RequestProduct Overview Cable Side Switch ModelsModel Description Cisco CGS-2520-16S-8PC Cable-Side View PortsPoE and PoE+ Ports 10/100BASE-T PortsSFP Modules Dual-Purpose Gigabit Ethernet PortsType of SFP Module Model SFP Module Patch CableAlarm Output Power-Input TerminalAlarm Ports Alarm InputManagement Ports LEDsSystem LED Switch Panel LEDsColor System Status Alarm LEDs Power Supply Module LEDsConsole LEDs LED Color Meaning Port LEDsPoE LED Color DescriptionSD Flash Memory Card LED Power Supply SideSD Flash Memory Card Dual-Purpose Port LEDsPSU OK LED Power Supply Features Power Supply-Side LEDsManagement Options Network Configurations Switch Installation 140F 60C Statement Verifying Switch Operation Installation Guidelines75 in .4 cm. Statement Mounting into a Rack Installing the SwitchMounting Brackets 2shows the 23-inch rack mounting brackets Attaching Brackets for 19-Inch RacksAttaching Brackets for 19-Inch Racks Attaching Brackets for 19-Inch Racks IP-30 Compliance Inserting the Rubber Plugs Inserting the Rubber Plugs Inserting the Rubber Plugs detail Attaching Brackets for 19-Inch Racks 10 Attaching Brackets for 19-Inch Racks Attaching Brackets for 23-Inch Racks11 Attaching Brackets for 23-Inch Racks Attaching Brackets for Etsi Racks12 Attaching Brackets for Etsi Racks Mounting the Switch into a Rack Attaching Brackets for Wall Mounting Wall-Mounting14 Attaching 19-inch Rack Brackets for Wall Mounting Wall-Mounting for IP-30 Compliance15 Inserting the Rubber Plugs into the Switch Holes Installing SFP Modules Installing and Removing SFP ModulesRemoving SFP Modules 17 Installing an SFP Module18 Removing a Bale Clasp Latch SFP Module Inserting and Removing the SFP Module Patch CableRemoving the SFP Module Patch Cable Replacing the SD Flash Memory Card21 Loosening the Captive Screw Device Crossover Cable Straight-Through Cable Connecting Devices to the Ethernet PortsConnecting to the 10/100 PoE+ Ports Connecting to the 10/100 and 10/100/1000 PortsWhere to Go Next Power Supply Modules Power Supply InstallationPWR-RGD-AC-DC Power Supply Module Power Supply Module InstallationInstalling a Power Supply Module Installation GuidelinesEquipment That You Need Grounding the Switch Dual-hole terminal lug Loosen the Screws on the Power Supply Blank Installing the Power Supply Module in the SwitchAC 5 A, DC 15 a Statement Wiring the Power SourcePSU2 11 Stripping the Input Power Source Wire 12 Crimping the Spade Terminal Lug AC power Removing the Power Supply Module15 Removing the Screws Switch Post Results Diagnosing ProblemsSwitch LEDs Link Status Switch ConnectionsBad or Damaged Cable Ethernet and Fiber-Optic Cables10/100 PoE+ Port Connections 10/100 and 10/100/1000 Port ConnectionsSFP Module Spanning Tree Loops Switch PerformanceInterface Settings Ping End DeviceCabling Distance Auto-Negotiation and Network Interface CardsFinding the Switch Serial Number Resetting the Switch to the Factory Default SettingsPhysical Specifications Switch SpecificationsEnvironmental Ranges Power Requirements Power Requirements Power Specifications Power Supply Module Specifications10/100 Ethernet Ports Connector SpecificationsFigure B-2 Fiber-Optic SFP Module LC Connector SFP Module ConnectorsAlarm Ratings Alarm PortDual-Purpose Ports Commercial SFPs Cables and AdaptersSFP Module Cables Industrial and Rugged SFPs100BASE-BX Cable Pinouts Extended temperature SFPsFigure B-6 DSR DTR CTS RTS Console Port Adapter PinoutsSwitch Console RJ-45-to-DB-25 Port DTE Adapter Device OL-31444-01 RJ-45 Console Port Accessing the CLI Through the Console PortFigure C-1 Connecting the Console Cable USB Console Port Figure C-2 Connecting the USB Console CableInstalling the Cisco Microsoft Windows XP USB Driver Installing the Cisco Microsoft Windows USB Device DriversInstalling the Cisco Microsoft Windows 2000 USB Driver Installing the Cisco Microsoft Windows Vista USB Driver Uninstalling the Cisco Microsoft Windows USB DriversIP Settings Entering the Initial Configuration InformationUninstalling the Cisco Microsoft Windows Vista USB Driver Completing the Setup Program These choices appear