Course: CP 210
Title: Advanced EtherNet/IP

Ethernet Packet

7 Main Parts of Ethernet Packet:

Preamble - Seven bytes of useful information. One portion, for example, is the first bit that determines whether the packet should be multi-cast, sent to multiple devices, or sent to just the destination device.

Start-of-Frame Delimiter - A series of 8 bits that tells the receiver the real message is starting. In other words, it's a way for the two devices to synchronize, much like two spies synchronize their watches to ensure they're on the same time frame.

Destination Address - Where the packet is going.

Source Address - Where the packet came from.

Length - The full size of the packet. Ensures the destination device "listens" for the full message.

Data - The actual data being sent, as well as information for other, higher protocols.

Frame Check Sequence - A calculated number the destination device uses to ensure it received all the data.

7 Main Parts of a Packet
1. Preamble
2. Start-of-Frame Delimiter
3. Destination Address
4. Source Address
5. Length
6. Data
7. Frame Check Sequence

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