Cisco Systems 3650 manual Switch Connections, Bad or Damaged Cable, Ethernet and Fiber Cables

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Chapter 5 Troubleshooting

Diagnosing Problems

Switch Connections

Bad or Damaged Cable

Always examine the cable for marginal damage or failure. A cable might be just good enough to connect at the physical layer, but it could corrupt packets as a result of subtle damage to the wiring or connectors. You can identify this situation because the port has many packet errors or the port constantly flaps (loses and regains link).

•Exchange the copper or fiber-optic cable with a known good cable.

•Look for broken or missing pins on cable connectors.

•Rule out any bad patch panel connections or media convertors between the source and destination. If possible, bypass the patch panel or eliminate media convertors (fiber-optic-to-copper).

•Try the cable in another port to see if the problem follows the cable.

•For Catalyst 3650 switch StackWise cable, remove and inspect the cable and StackWise port for bent pins or damaged connectors. If the StackWise cable is bad, replace it with a known good cable.

Ethernet and Fiber Cables

Make sure that you have the correct cable:

•For Ethernet, use Category 3 copper cable for 10 Mbps UTP connections. Use either Category 5, Category 5e, or Category 6 UTP for 10/100 or 10/100/1000 Mbps connections.

•Verify that you have the correct fiber-optic cable for the distance (100 meters or less) and port type. Make sure that the connected device ports match and use the same type encoding, optical frequency, and fiber type. For more information about cabling, see the “SFP and SFP+ Module Cable Specifications” section on page B-7.

•Determine if a copper crossover cable was used when a straight-through was required, or the reverse. Enable auto-MDIX on the switch, or replace the cable. See Table 2-1for recommended Ethernet cables.

Link Status

Verify that both sides have a link. A broken wire or a shut-down port can cause one side to show a link even though the other side does not have a link.

A port LED that is on does not guarantee that the cable is functional. It might have encountered physical stress, causing it to function at a marginal level. If the port LED does not turn on:

•Connect the cable from the switch to a known good device.

•Make sure that both ends of the cable are connected to the correct ports.

•Verify that both devices have power.

•Verify that you are using the correct cable type. See Appendix B, “Connector and Cable Specifications” for more information.

•Look for loose connections. Sometimes a cable appears to be seated but is not. Disconnect the cable and then reconnect it.

Catalyst 3650 Switch Hardware Installation Guide

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OL-29734-01

 

 

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Contents Preface PurposeDocument Conventions Obtaining Documentation and Submitting a Service Request Related DocumentationSwitch Models Switch Model Cisco IOS Image DescriptionProduct Overview Product Overview Switch Models Switch Model Cisco IOS Image Description Front Panel Catalyst 3650-48PD-L Switch Front Panel 10/100/1000 Ethernet Ports PoE and PoE+Management Ports USB Type a Port USB Mini-Type B PortUplink Ports LEDsSFP and SFP+ Modules 3 4 5 Color System StatusMode LED Port Mode Description Port LEDs and ModesPort Mode Port LED Color Meaning USB Console LED ColorPoE+ LED Color DescriptionUplink Ports LEDs Color PoE+ StatusRear Panel Color Uplink Ports Link StatusRJ-45 Console Port LED StackWise PortsRJ-45 Console Port Status1 Power Supply Modules AC-Power Supply Module LEDs Models Default Power Supply Available PoE PowerPoE Option Port Switch ModelsDC-Power Supply Module LEDs Fan ModulesManagement Options Ethernet Management PortRJ-45 Console Port Network Configurations OL-29734-01 Switch Installation Preparing for InstallationSafety Warnings OL-29734-01 Installation Guidelines Powering Off the Switch Planning a Switch Data StackVerifying Switch Operation Tools and EquipmentSwitch Stacking Guidelines Data Stack Cabling ConfigurationsData Stacking up to Four Switches in a Side-by-Side Mounting Data Stack Bandwidth and Partitioning ExamplesPower-On Sequence for Switch Data Stacks Example of a Data Stack with Half Bandwidth ConnectionsChanges to Switch Stack Membership Installing the Switch Rack-Mounting Attaching the Rack-Mount Brackets Rack-Mounting BracketsAttaching Brackets for 19-inch Racks Mounting the Switch in a Rack Mounting the Switch in a RackAfter Installing the Switch Table- or Shelf-MountingConnecting to the StackWise Ports Installing the StackWise Adapter in a StackWise Port Installing and Removing SFP and SFP+ Modules Installing SFP and SFP+ Modules14 Installing an SFP Module in an Uplink Port Connecting Devices to the Ethernet Ports Removing SFP or SFP+ Modules10/100/1000 Ethernet Port Connections Switch Installation Connecting Devices to the Ethernet Ports PoE+ Port Connections Device Crossover CableWhere to Go Next Power Supply Installation Power Supply Module OverviewPart Number Description AC OK LED 640-W AC Power Supply Module 6 5 Installation Guidelines AC Power Supply Module LEDsDC Power Supply Module LEDs Installing or Replacing an AC Power Supply Installing a DC Power Supply StatementGrounding the Switch Equipment That You NeedStripping the Ground Wire 10 Attaching the Ground Lug and Wire Assembly Installing the DC Power Supply in the Switch Wiring the DC Input Power SourceFinding the Power Supply Module Serial Number 12 DC Source a Isolated From Source B with No Common Ground14 1025-W AC Power Supply Serial Number 16 640-W DC Power Supply Module Serial Number Installing the Fan OverviewFan Module Installation Installing a Fan Module Fan LEDFinding the Fan Module Serial Number Fan Module Serial NumberSwitch Post Results TroubleshootingDiagnosing Problems Switch LEDsEthernet and Fiber Cables Switch ConnectionsBad or Damaged Cable Link Status10/100/1000 Port Connections PoE and PoE+ Port ConnectionsSFP Modules Ping End Device Switch PerformanceInterface Settings Spanning Tree LoopsResetting the Switch Autonegotiation and Network Interface CardsCabling Distance Finding the Switch Serial Number Replacing a Failed Data Stack MemberTechnical Specifications Switch SpecificationsEnvironmental Ranges Physical Specifications Power Supply Module Specifications Power SpecificationsPower Specifications Fan Module Specifications Physical SpecificationOperating Specification OL-29734-01 Connector and Cable Specifications Connector Specifications10/100/1000 Ports Gigabit Ethernet CX1 SFP+ Copper Connectors SFP and SFP+ ModulesFigure B-4 Simplex LC Cable Connector 10/100/1000 Ethernet Management PortConsole Port Figure B-7 10/100 Port PinoutsCable and Adapter Specifications StackWise CablesLocating the StackWise Adapter Serial Number StackWise AdaptersStackWise Cables Minimum Bend Radius and Coiled Diameter Cable Part Number Cable Length Minimum Bend RadiusSFP and SFP+ Module Cable Specifications StackWise Adapter BlanksFour Twisted-Pair Cable Pinouts Two Twisted-Pair Cable PinoutsConsole Port Adapter Pinouts Switch Console RJ-45-to-DB-9 Port DTEIdentifying a Crossover Cable DeviceSwitch Console RJ-45-to-DB-25 Port DTE DSR DTR CTS RTSAccessing the CLI Through Express Setup Configuring the Switch with the CLI-Based Setup ProgramAccessing the CLI Accessing the CLI Through a Console PortUSB Console Port Installing the Cisco Microsoft Windows USB Device Driver Uninstalling the Cisco Microsoft Windows USB Driver Uninstalling the Cisco Microsoft Windows XP USB DriverEntering the Initial Configuration Information IP SettingsConfiguring the Setup Program Enter a host name for the switch, and press Return These choices appear OL-29734-01
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