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Andreas.Eversberg Andreas.Eversberg at versatel.de> The timer recovery condition is only cleared if the data link layer > entity receives a valid supervisory frame response > with the F bit set to "1". If the N(R) of this received supervisory > frame is within the range from its current state variable > V(A) to its current send state variable V(S) inclusive, it shall set > its send state variable V(S) to the value of the received > N(R). Timer T200 shall be reset if the received supervisory frame > response is an RR or REJ response with F bit set to > "1". The data link layer entity shall then resume with I frame > transmission or retransmission, as appropriate. > Timer T200 shall be set if the received supervisory response is an RNR > response, and the data link layer shall proceed > with the enquiry process in accordance with subclause 5.5.5. hi sylvain, you are right. in case of an RR "response" (or an I frame) with the F bit set to "1", there is no clearing of the "timer recovery state". in other cases (RNR, REJ) it is handled. i would like to test this with a prepared frame drop tonight. if this works, i will commit it. regards, andreas