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High-Level Data Link Control
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====Receive Ready (RR)==== * Bit value = 00 (0x00 to match above table type field bit order<ref>{{Cite web|url=http://www.euclideanspace.com/coms/protocol/x25/link/f_types/index.htm#rr|title = X.25 frame types - Martin Baker}}</ref>) * Indicate that the sender is ready to receive more data (cancels the effect of a previous RNR). * Send this packet if you need to send a packet but have no I frame to send. * A primary station can send this with the P-bit set to solicit data from a secondary station. * A secondary terminal can use this with the F-bit set to respond to a poll if it has no data to send.
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