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Connectors
Cat 5 & 5e Network
Straight-Through vs Cross-Over
- In general, the patch cords that you use with your Ethernet connections are "straight-through", which means that pin 1 of the plug on one end is connected to pin 1 of the plug on the other end (for either standard).
- The only time you cross connections in 10BaseT is when you connect two Ethernet devices directly together without a hub or connect two hubs together. Then you need a "cross-over" patch cable, which crosses the transmit and receive pairs. An easy way remember how to make a cross-over cable is to wire one end with the T-568A standard and the other with the T-568B standard.
Crossover Cables:
- Normal cables that connect a PC/NIC card to a hub are wired straight through. That is pin 1 is connected to pin 1, pin 2 to pin 2, etc. However, if you are simply connecting two PCs together without a hub, you need to use a crossover cable made by reversing pair 2 and 3 in the cable, the two pairs used for transmisson by Ethernet. The easy way to make a crossover cable is to make one end to T568A color coding and the other end to T568B. Then the pairs will be reversed.
Pin Number Designations
T-568B
| Pin | Color | Pair | Descrtipion | 
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|
| 1 | white/orange | 2 | TxData + | ||
| 2 | orange | 2 | TxData - | ||
| 3 | white/green | 3 | RecvData + | ||
| 4 | blue | 1 | Unused | ||
| 5 | white/blue | 1 | Unused | ||
| 6 | green | 3 | RecvData - | ||
| 7 | white/brown | 4 | Unused | ||
| 8 | brown | 4 | Unused |
T-568A
| Pin | Color | Pair | Description | 
|
|
| 1 | white/green | 3 | RecvData + | ||
| 2 | green | 3 | RecvData - | ||
| 3 | white/orange | 2 | TxData + | ||
| 4 | blue | 1 | Unused | ||
| 5 | white/blue | 1 | Unused | ||
| 6 | orange | 2 | TxData - | ||
| 7 | white/brown | 4 | Unused | ||
| 8 | brown | 4 | Unused |
Note: Odd pin numbers are always the striped wires..
HDMI Connector
Tips & Tricks from Platinum Tools
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