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Why is the SFD (Start Frame Delimiter) value 171 (10101011 in binary notation)?

Is it just a constant number?

I'm just curious...

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The ethernet SFD is is a continuation and ending of the preamble. The preamble, from the original ethernet specification, is a series of alternating bits which aided signal synchronization. The SFD continues the synchronization until the last bit, which is a one instead of zero. This one bit marks the end of synchronization.

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