Gigabit Ethernet is a transmission technology that is used to network devices in a wired local environment. This environment is called a Local Area Network (LAN) and allows connected devices to send and receive data over a cable at a rate of 1 billion bits per second. The main components include the RJ45 connector that connects to the ethernet cable, the 4 differential pairs that transmit data, and the controller that acts as a bridge between the ethernet and the PCIe or RGMII microcontrollers.
.png?version=1&modificationDate=1617407629297&cacheVersion=1&api=v2&height=250)
.png?version=1&modificationDate=1617407629297&cacheVersion=1&api=v2&height=400)
Resources:
https://resources.altium.com/p/gigabit-ethernet-101-basics-implementation
...
Gigabit Ethernet uses 4 differential pairs to transmit and receive data. Each of these pairs is bi-directional so they can send and receive data at the same time. They are also backwards compatible with slower methods of ethernet such as 100 Mbps and 10Mbps. The naming and colour codes for these pairs are seen below:
The data is sent in 56-bit packages with the following structure:
Resources:
http://www.interfacebus.com/Gigabit_Ethernet_Description.html
https://allpinouts.org/pinouts/connectors/networking/ethernet-1000base-t-gigabit/
Controller
The ethernet controller is the bridge between the ethernet and the microcontroller that uses either PCIe or RGMII for further data transmission. They generally integrate the PHY and MAC interface.
- bridging between ethernet and PCIE/RGMII
- Reference Clock
- EEPROM storage
...