SMC Networks SMC8926EM, SMC8950EM manual Straight-Through Wiring, Crossover Wiring

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B Cables

Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts

Pin

MDI Signal Name

MDI-X Signal Name

1

Transmit Data plus (TD+)

Receive Data plus (RD+)

 

 

 

2

Transmit Data minus (TD-)

Receive Data minus (RD-)

 

 

 

3

Receive Data plus (RD+)

Transmit Data plus (TD+)

 

 

 

6

Receive Data minus (RD-)

Transmit Data minus (TD-)

 

 

 

4,5,7,8

Not used

Not used

 

 

 

Note: The “+” and “-” signs represent the polarity of the wires that make up each wire pair.

Straight-Through Wiring

If the twisted-pair cable is to join two ports and only one of the ports has an internal crossover (MDI-X), the two pairs of wires must be straight-through. (When auto-negotiation is enabled for any RJ-45 port on these switches, you can use either straight-through or crossover cable to connect to any device type.)

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 Straight-through 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-2 Straight-through Wiring

Crossover Wiring

If the twisted-pair cable is to join two ports and either both ports are labeled with an “X” (MDI-X) or neither port is labeled with an “X” (MDI), a crossover must be implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port on these switches, you can use either straight-through or crossover cable to connect to any device type.)

B-2

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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 Power Cord Safety Safety CompliancePower Cord Set France et Pérou uniquement Environmental Statement Documentation About This Guide Contents Making Network Connections Glossary Index Tables Figures Figures Introduction OverviewSwitch Architecture Network Management OptionsIntroduction Activity On/Flashing Green Port Status LEDsCondition Status Link SpeedOptional Redundant Power Supply Power Supply SocketsExtender Module LEDs Features and BenefitsOptional Media Extender Modules ConnectivityPerformance ExpandabilityManagement Introduction Introduction 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 ConnectionsUsing Layer 3 Routing Application Notes Network Planning Selecting a Site Installing the SwitchEthernet Cabling Package Contents Equipment ChecklistOptional Rack-Mounting Equipment Mounting Rack MountingInstalling the Switch in a Rack Desktop or Shelf MountingInstalling an Optional Module into the Switch Installing an Optional ModuleInstalling an Optional SFP Transceiver Inserting an SFP Transceiver into a SlotConnecting Switches in a Stack Making Stacking ConnectionsConnecting to a Power Source Stacking TopologiesWiring Map for Serial Cable Connecting to the Console PortSerial Cable Wiring Switch’s 8-Pin Null Modem PC’s 9-Pin Installing the Switch Twisted-Pair Devices Connecting Network DevicesMaking Network Connections Cabling GuidelinesConnecting to PCs, Servers, Hubs and Switches Network Wiring ConnectionsNetwork Wiring Connections Fiber Optic SFP DevicesGbps Fiber Optic Connections Making Connections to SFP TransceiversConnecting to an XFP Transceiver 1000BASE-T Cable Requirements Connectivity RulesGbps Ethernet Collision Domain Mbps Fast Ethernet Collision Domain Mbps Gigabit Ethernet Collision DomainMbps Ethernet Collision Domain Cable Labeling and Connection Records Appendix a Troubleshooting Diagnosing Switch IndicatorsInstallation Power and Cooling ProblemsIn-Band Access Stack Troubleshooting Troubleshooting Twisted-Pair Cable and Pin Assignments Appendix B Cables10BASE-T/100BASE-TX Pin Assignments Straight-Through Wiring Crossover WiringFigure B-3 Crossover Wiring 1000BASE-T Pin AssignmentsAdjusting Existing Category 5 Cabling to Run 1000BASE-T Cable Testing for Existing Category 5 CableFiber Standards Nm Loss-Minimized Dispersion-Shifted FiberNon-Zero Dispersion-Shifted Cables Appendix C Specifications Physical CharacteristicsPower Supply WeightTemperature Power ConsumptionManagement Features Switch FeaturesStandards Compliances Extender ModulesGlossary 10BASE-TCSMA/CD Ieee TIA Index NumericsIndex-2 Index-3 Index Index-4 Page 150200000054A R01

SMC8926EM, SMC8950EM specifications

SMC Networks has established itself as a prominent player in the networking and connectivity market, offering a range of professional solutions designed for small to medium-sized enterprises. Among its notable products are the SMC8950EM and the SMC8926EM, two advanced Ethernet switches that cater to the need for reliable and efficient networking.

The SMC8950EM is an enterprise-class managed switch that delivers high-performance capability with 48 10/100/1000Mbps Ethernet ports, providing extensive connectivity for various devices on a local area network. Its architecture is designed to handle high traffic loads, making it apt for environments where speed and reliability are paramount. This switch supports multiple protocols, including VLANs, which allow for flexible network segmentation and improved security. The SMC8950EM also features several Layer 2 and Layer 3 management protocols, enabling the switch to support advanced routing, Quality of Service (QoS), and network traffic management.

On the other hand, the SMC8926EM is a compact yet powerful switch equipped with 24 10/100/1000Mbps Ethernet ports, making it ideal for smaller installations or branch offices that require scalability without compromising on performance. With support for Power over Ethernet (PoE), the SMC8926EM simplifies the implementation of IP phones, security cameras, and wireless access points, making it particularly useful in environments where power outlets may be limited.

Both models employ advanced technologies, such as network storm control and link aggregation, to enhance performance and ensure seamless connectivity. They also provide comprehensive network monitoring capabilities, allowing administrators to manage traffic and troubleshoot issues proactively. The user-friendly web interface facilitates easier management and configuration, while SNMP support enables integration with existing network management systems for enhanced visibility and control.

Ultimately, the SMC8950EM and SMC8926EM represent robust networking solutions that address the challenges faced by modern enterprises. With their combination of high performance, advanced features, and scalability, these switches are well-suited for companies looking to build a reliable and efficient network infrastructure. Whether for a large organization or a small branch office, SMC Networks continues to deliver products that meet the evolving needs of users worldwide.
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