SMC Networks SMCGS24 1000BASE-T Cable Requirements, Cable Testing for Existing Category 5 Cable

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1000BASE-T CABLE REQUIREMENTS

1000BASE-T Cable Requirements

All Category 5 UTP cables that are used for 100BASE-TX connections should also work for 1000BASE-T, providing that all four wire pairs are connected. However, it is recommended that for all critical connections, or any new cable installations, 4-pair Category 5e (enhanced Category 5) cable should be used. The Category 5e specifications include test parameters that are only recommendations for Category 5. Therefore, the first step in preparing existing Category 5 cabling for running 1000BASE-T is a simple test of the cable installation to be sure that it complies with the IEEE 802.3ab standards.

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.

Additionally, 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

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 6 cables.

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

3.Reconnect some of the connectors in the link.

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Contents Page Page EZ Switch 10/100/1000 User Guide Trademarks Limited Warranty Limited Warranty EC Conformance Declaration Class a CompliancesFCC Class a Japan Vcci Class a Industry Canada Class aCompliances Power Cord Set Vii Viii Halten Audience Environmental StatementPurpose Warnhinweis Faseroptikanschlüsse Optische Sicherheit Safety ComplianceXii Table of Contents Viii Introduction Features and BenefitsFront Panel LEDs Front Panel RJ-45 PortsRear Panel Selecting a Site Installing the SwitchPackage Contents Instructions Installing the Switch Typical application for the SMCGS16 is illustrated below Application ExampleDiagnosing Switch Indicators TroubleshootingSymptom Possible Solutions10BASE-T/100BASE-TX Pin Assignments Cable SpecificationsCables 1000BASE-T Pin Assignments Pin MDI-X Signal Name MDI Signal Name1000BASE-T Cable Requirements Cable Testing for Existing Category 5 CableAdjusting Existing Category 5 Cabling EZ Switch 10/100/1000 Product SpecificationsPower Consumption WeightPower Requirement TemperatureProduct Specifications Page For Technical SUPPORT, Call
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