Enterasys Networks V2H124-24P manual Fiber Standards, Cable Testing for Existing Category 5 Cable

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B Cables

Cable Testing for Existing Category 5 Cable

Installed Category 5 cabling must pass tests for Attenuation, Near-End Crosstalk (NEXT), and Far-End Crosstalk (FEXT). This cable testing information is specified in the ANSI/TIA/EIA-TSB-67 standard. Cables must also pass test parameters for Return Loss and Equal-Level Far-End Crosstalk (ELFEXT). These tests are specified in the ANSI/TIA/EIA-TSB-95 Bulletin, “The Additional Transmission Performance Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”

Note that when testing your cable installation, be sure to include all patch cables between switches and end devices.

Adjusting Existing Category 5 Cabling to Run 1000BASE-T

If your existing Category 5 installation does not meet one of the test parameters for 1000BASE-T, there are basically three measures that can be applied to try to correct the problem:

1.Replace any Category 5 patch cables with high-performance Category 5e or Category 6 cables.

2.Reduce the number of connectors used in the link.

3.Reconnect some of the connectors in the link.

Fiber Standards

The current TIA (Telecommunications Industry Association) 568-A specification on optical fiber cabling consists of one recognized cable type for horizontal subsystems and two cable types for backbone subsystems.

Horizontal 62.5/125 micron multimode (two fibers per outlet).

Backbone 62.5/125 micron multimode or single-mode.

TIA 568-B will allow the use of 50/125 micron multimode optical fiber in both the horizontal and backbone in addition to the types listed above. All optical fiber components and installation practices must meet applicable building and safety codes.

B-4

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Contents Matrix V-Series V2H124-24P Fast Ethernet Switch Page Page Regulatory Compliance Information Environmental Requirements Safety Compliance Power Cord Set France et Pérou uniquement Vii Declaration of Conformity Enterasys Networks, Inc Firmware License Aggreement Page Page Xii Contents Appendix C Specifications C-1 Glossary Index Tables Figures Figures Overview Switch ArchitectureIntroduction Power-over-Ethernet Capability Network Management OptionsDescription of Hardware 10/100BASE-T Ports1000BASE-T/SFP Ports Port and System Status LEDsSystem Status LEDs System Status LEDs Mode PoE/Link Button Stack Master ButtonPower Supply Receptacle Optional Stacking TransceiverFeatures and Benefits ConnectivityPerformance ManagementIntroduction to Switching Network PlanningApplication Examples Collapsed BackboneNetwork Aggregation Plan Network Aggregation PlanRemote Connections with Fiber Cable Remote Connections with Fiber CableMaking Vlan Connections Making Vlan ConnectionsApplication Notes Ethernet Cabling Installing the SwitchSelecting a Site Getting Help Equipment ChecklistPackage Contents Rack Mounting MountingOptional Rack-Mounting Equipment Installing the Switch in a Rack Desktop or Shelf MountingInstalling an SFP Transceiver Installing an SFP TransceiverStacking Switches Installing a Stacking TransceiverConnecting Switches in a Stack Connecting Switches in a StackConnecting to a Power Source Connecting to the Console PortWiring Map for Serial Cable DTE PortInstalling the Switch Connecting Network Devices Power-over-Ethernet ConnectionsMaking Network Connections Twisted-Pair DevicesConnecting to PCs, Servers, Hubs and Switches Cabling GuidelinesNetwork Wiring Connections Network Wiring ConnectionsFiber Optic Devices Making Fiber Port ConnectionsMbps Gigabit Ethernet Collision Domain Connectivity Rules1000BASE-T Cable Requirements Mbps Ethernet Collision Domain Cable Labeling and Connection RecordsMbps Fast Ethernet Collision Domain Power and Cooling Problems Appendix a TroubleshootingDiagnosing Switch Indicators Stack Troubleshooting InstallationIn-Band Access 10/100BASE-TX Pin Assignments Appendix B CablesTwisted-Pair Cable and Pin Assignments Straight-Through Wiring Crossover Wiring1000BASE-T Pin Assignments Twisted-Pair Cable and Pin Assignments BCable Testing for Existing Category 5 Cable Fiber StandardsAppendix C Specifications Physical CharacteristicsSwitch Features Management FeaturesStandards CompliancesSpecifications Glossary 10BASE-TIeee LED Virtual LAN Vlan Index NumericsIndex-2 Page ES3526-PoE-60 P/N 150200039300A E042004-R01