πŸ”Œ Crimping and Difference Between Crossover and Straight-Through Cable

 

Crimping Straight-Through Cable vs Cross-Over Cable

A crimping tool is used to attach RJ-45 connectors to Ethernet cables. The difference between Straight-Through and Cross-Over cables is the wiring order of the colored wires.

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Group 1 Devices

Examples: Computers (PCs), Servers, Routers

Group 2 Devices

Examples: Switches, Layer3 Switches.. 

Straight through - Different group devices 
Cross over - Same group devices.. 

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Straight-Through Cable

Used to connect different devices, such as:

  • PC ↔ Switch
  • PC ↔ Router
  • Switch ↔ Router

Both ends use the same standard (usually T568B).

T568B Wiring Order (Pin 1 to Pin 8)

PinColor
1White/Orange
2Orange
3White/Green
4Blue
5White/Blue
6Green
7White/Brown
8Brown
End A (T568B)           End B (T568B)

1 White/Orange    --->  1 White/Orange
2 Orange          --->  2 Orange
3 White/Green     --->  3 White/Green
4 Blue            --->  4 Blue
5 White/Blue      --->  5 White/Blue
6 Green           --->  6 Green
7 White/Brown     --->  7 White/Brown
8 Brown           --->  8 Brown

Cross-Over Cable

Used to connect similar devices, such as:

  • PC ↔ PC
  • Switch ↔ Switch (older devices)
  • Hub ↔ Hub

One end uses T568A, the other uses T568B.

T568A Wiring Order

PinColor
1White/Green
2Green
3White/Orange
4Blue
5White/Blue
6Orange
7White/Brown
8Brown

Cross-Over Mapping

End A (T568A)           End B (T568B)

1 White/Green     --->  3 White/Green
2 Green           --->  6 Green
3 White/Orange    --->  1 White/Orange
4 Blue            --->  4 Blue
5 White/Blue      --->  5 White/Blue
6 Orange          --->  2 Orange
7 White/Brown     --->  7 White/Brown
8 Brown           --->  8 Brown

Crimping Steps

4
  1. Strip about 1 inch (2.5 cm) of the cable jacket.
  2. Untwist the wire pairs.
  3. Arrange wires according to T568A or T568B.
  4. Straighten and trim the wires evenly.
  5. Insert wires fully into the RJ-45 connector.
  6. Verify wire order.
  7. Use the crimping tool to crimp the connector.
  8. Test the cable with a cable tester.

    https://www.youtube.com/shorts/BrXcIIDlEEQ

πŸ”Œ Difference Between Crossover and Straight-Through Cable

FeatureStraight-Through CableCrossover Cable
PurposeConnect different types of devicesConnect similar types of devices
Typical UsePC → Switch, Switch → RouterPC → PC, Switch → Switch, Router → Router
Pin ConnectionPins 1→1, 2→2, 3→3, 6→6TX ↔ RX crossover (Pins 1↔3, 2↔6)
Cable Color CodeBoth ends use same wiring standard (T568A ↔ T568A or T568B ↔ T568B)One end T568A, other end T568B
Data FlowTransmit and receive on different pairsTransmit of one device connects to receive of the other

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