Ethernet Frame
Before Bit Transmission on a RJ-45 starts, Data is encapsulated in the Data Layer using the Ethernet Protocol Encapsulation.
Ethernet Jargon
Ethernet protocol uses FCS which has different jargon than Frames that use CRC
Structure
Header
- Premable: Used for synchronization
- Start Frame Delimitter: Signifies that next byte is start of destination address
- Destination MAC address: Signifies destination
- Source MAC address: Signifies source
- Ethernet Type: IPv4,IPv6,SNA,DECnet,AppleTalk,etc…
Payload
The middle is the payload data