> For the complete documentation index, see [llms.txt](https://mudassirs46.gitbook.io/network-fundamentals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mudassirs46.gitbook.io/network-fundamentals/cabling-pinouts-ethernet-utp.md).

# Cabling Pinouts (Ethernet UTP)

* For [Transmitting Data on UTP](https://app.gitbook.com/@mudassirs46/s/network-fundamentals/~/drafts/-MRZ8l67L5MHnaQIEh9W/transmitting-data-over-ethernet-utp).

  **Pinouts for 10BASE-T and 100BASE-T:**
* 10BASE-T & 100BASE-T both use 2 pairs of 4 Wires:
* To connect two different devices a Straight-through Cable is used but to connect two similar devices Crossover Cable is used.

  **PC, ROUTERS & WAP's Ethernet Interface Transmits on Pin 1&2 and Receives at Pin 3&6**

  whereas 

  **HUB & SWITCH Transmits at Pin 3&6 and Receives on Pin 1&2.**
* But if 2 PCs are connected then also they both will transmit at Pin 1&2 and receive at Pin 3&6. Hence a Straight-through cable won't work.
* To connect two Similar devices we need a Straight Cable. But to connect two different devices we need a Crossover Cable.
* Crossover cable will now be able to connect two PC by connecting PC 1's Pin 1-PC2's Pin 3 and lastly PC1's Pin 2-PC2's Pin 6.
* Similarly to connect two Switch by connecting SW1's Pin3-SW2's Pin1 and lastly SW1's Pin6-SW2's Pin2.

  **Pinouts for 1000BASE-T:**
* 1000BASE-T both uses all the 4 pairs of 8 Wires:
* In 1000BASE-T **CROSSOVER CABLE** Pins 1,2,4&5 Transmits (TX) & Pins 3,6,7&8 Receives (RX)

## Reference:

CCNA 200-301 OCG, Volume 1, Pg. 42,43,44,45,46 - Wendell Odom.