What Is Frame Check Sequence?

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When you send data packets, they can get lost in the ether. You know how sometimes you're just sending an email or a text, and it's not even that important, and then something happens, and you're like, "Wait, did I just lose this?" Well, you did. That's where Frame Check Sequence comes in! FCS is an extra bit of data added to the end of your packet that helps make sure it makes it through intact. If an error occurs while the pack is in transit, the receiving device will be able to recognize this error by checking its FCS value against what was initially sent. If the FCSs do not match, the data is discarded. The process by which frames are handed off from one piece of hardware to another is often called "handoff." During this process, a set of bits is added to the frame's header. This set of bits is called "handoff data" and synchronizes the new piece of hardware with the structure. The frame check sequence is a checksum that ensures your data reaches its destination intact. It's like a security guard for your information—it keeps an eye on how things are going, and if anything happens along the way, it's there to let you know about it. The source calculates the frame check sequence and adds it to the end of the data frame before it's sent. That frame arrives at its destination and is checked against what was expected by both parties: If the FCS matches what was calculated by the receiver, then everything is excellent. If not well, then something went wrong! At that point, you can decide whether or not to discard the whole thing or try again—it depends on what your situation calls for (and how much time you have).

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