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High-Level Data Link Control
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====Reject (REJ)==== * Bit value = 10 (0x08 to match above table type field bit order<ref>{{Cite web|url=http://www.euclideanspace.com/coms/protocol/x25/link/f_types/index.htm#rej|title = X.25 frame types - Martin Baker}}</ref>) * Requests immediate retransmission starting with N(R). * Sent in response to an observed sequence number gap; e.g. after seeing I1/I2/I3/I5, send REJ4. * Optional to generate; a working implementation may use only RR.
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