SMC Networks SMC8950EM, SMC8926EM manual 1000BASE-T Pin Assignments, Figure B-3 Crossover Wiring

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Twisted-Pair Cable and Pin Assignments B

You must connect all four wire pairs as shown in the following diagram to support Gigabit Ethernet connections.

EIA/TIA 568B RJ-45 Wiring Standard 10/100BASE-TX Crossover Cable

White/Orange Stripe

Orange

 

1

White/Green Stripe

1

End A

2

 

2

 

3

Blue

3

 

4

 

4

 

5

White/Blue Stripe

5

 

6

Green

6

 

7

7

 

 

 

8

White/Brown Stripe

8

 

 

 

End B

Brown

Figure B-3 Crossover Wiring

1000BASE-T Pin Assignments

All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use straight-through cables for all network connections to PCs or servers, or to other switches or hubs.

The table below shows the 1000BASE-T MDI and MDI-X port pinouts. These ports require that all four pairs of wires be connected. Note that for 1000BASE-T operation, all four pairs of wires are used for both transmit and receive.

Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for 1000BASE-T connections. Also be sure that the length of any twisted-pair connection does not exceed 100 meters (328 feet).

Table B-2 1000BASE-T MDI and MDI-X Port Pinouts

Pin

MDI Signal Name

MDI-X Signal Name

 

 

 

1

Bi-directional Pair A Plus (BI_DA+)

Bi-directional Pair B Plus (BI_DB+)

 

 

 

2

Bi-directional Pair A Minus (BI_DA-)

Bi-directional Pair B Minus (BI_DB-)

 

 

 

3

Bi-directional Pair B Plus (BI_DB+)

Bi-directional Pair A Plus (BI_DA+)

 

 

 

4

Bi-directional Pair C Plus (BI_DC+)

Bi-directional Pair D Plus (BI_DD+)

 

 

 

5

Bi-directional Pair C Minus (BI_DC-)

Bi-directional Pair D Minus (BI_DD-)

 

 

 

6

Bi-directional Pair B Minus (BI_DB-)

Bi-directional Pair A Minus (BI_DA-)

 

 

 

7

Bi-directional Pair D Plus (BI_DD+)

Bi-directional Pair C Plus (BI_DC+)

 

 

 

8

Bi-directional Pair D Minus (BI_DD-)

Bi-directional Pair C Minus (BI_DC-)

 

 

 

B-3

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Contents Installation Guide TigerStack II 10/100/1000 Installation Guide Page Warranty and Product Registration Compliances and Safety Warnings CE Mark Declaration of Conformance for EMI and Safety EEC Safety Compliance Power Cord SafetyPower Cord Set France et Pérou uniquement Environmental Statement Documentation About This Guide Contents Making Network Connections Glossary Index Tables Figures Figures Overview IntroductionNetwork Management Options Switch ArchitectureIntroduction Speed Port Status LEDsCondition Status Link Activity On/Flashing GreenPower Supply Sockets Optional Redundant Power SupplyConnectivity Features and BenefitsOptional Media Extender Modules Extender Module LEDsManagement ExpandabilityPerformance Introduction Network Planning Introduction to SwitchingCollapsed Backbone Application ExamplesNetwork Aggregation Plan Network Aggregation PlanRemote Connections with Fiber Cable Remote Connections with Fiber CableMaking Vlan Connections Making Vlan ConnectionsUsing Layer 3 Routing Application Notes Network Planning Ethernet Cabling Installing the SwitchSelecting a Site Optional Rack-Mounting Equipment Equipment ChecklistPackage Contents Rack Mounting MountingDesktop or Shelf Mounting Installing the Switch in a RackInstalling an Optional Module Installing an Optional Module into the SwitchInserting an SFP Transceiver into a Slot Installing an Optional SFP TransceiverMaking Stacking Connections Connecting Switches in a StackStacking Topologies Connecting to a Power SourceSerial Cable Wiring Switch’s 8-Pin Null Modem PC’s 9-Pin Connecting to the Console PortWiring Map for Serial Cable Installing the Switch Cabling Guidelines Connecting Network DevicesMaking Network Connections Twisted-Pair DevicesNetwork Wiring Connections Connecting to PCs, Servers, Hubs and SwitchesFiber Optic SFP Devices Network Wiring ConnectionsMaking Connections to SFP Transceivers Gbps Fiber Optic ConnectionsConnecting to an XFP Transceiver Gbps Ethernet Collision Domain Connectivity Rules1000BASE-T Cable Requirements Mbps Ethernet Collision Domain Mbps Gigabit Ethernet Collision DomainMbps Fast Ethernet Collision Domain Cable Labeling and Connection Records Diagnosing Switch Indicators Appendix a TroubleshootingIn-Band Access Power and Cooling ProblemsInstallation Stack Troubleshooting Troubleshooting 10BASE-T/100BASE-TX Pin Assignments Appendix B CablesTwisted-Pair Cable and Pin Assignments Crossover Wiring Straight-Through Wiring1000BASE-T Pin Assignments Figure B-3 Crossover WiringFiber Standards Cable Testing for Existing Category 5 CableAdjusting Existing Category 5 Cabling to Run 1000BASE-T Non-Zero Dispersion-Shifted Dispersion-Shifted FiberNm Loss-Minimized Cables Physical Characteristics Appendix C SpecificationsPower Consumption WeightTemperature Power SupplyStandards Switch FeaturesManagement Features Extender Modules Compliances10BASE-T GlossaryCSMA/CD Ieee TIA Numerics IndexIndex-2 Index-3 Index Index-4 Page 150200000054A R01

SMC8926EM, SMC8950EM specifications

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