HDLC format Fig 1 shows the HDLC frame format consisting of 6 different fields. Each frame has a different length to serve its respective purpose as following:  Flag field is an 8-bit sequence that identifies the beginning and the end of a frame. It serves the purpose of synchronization.

HDLC format Fig 1 shows the HDLC frame format consisting of 6 different fields. Each frame has a different length to serve its respective purpose as following:  Flag field is an 8-bit sequence that identifies the beginning and the end of a frame. It serves the purpose of synchronization.

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