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in ABM shall cease transmitting I-frames at the earliest
possible time by completing or aborting the frame in process.
The combined station receiving an RNR shall perform a timeout
operation before resuming asynchronous transmission of
I-frames unless the busy condition is reported as cleared by the
remote combined station. If the RNR was received as a
command with the P bit set lo "I", the receiving station shall
respond with an S-frame with the F bit set to bbl".
8.6.4.3.1.2 The busy condition shall be cleared at the
station which transmitted the RNR when the internal constraint
ceases. Clearance of the busy condition shall be reported to the
remote station by transmission of an RR, REJ, SABM, or UA
frame (with or without the P/F bit set to "I").
7/11/96
No. 71
Annex I0 - Aeronautical Telecommunications Volume ZII
FRMR WORMATION FIELD BITS FOR BASIC (SABM) OPERAnON
First bit
transmitted
~ -
where:
rejected basic 'control field is the control field of the received frame which caused the frame reject;
V(S) is tbc current value of the send state variable at the remote combined station reporting the error condition
(bit 10 = low order bit);
V(R) is the current value of the receive state variable at the remote combined station reporting the error condition
(bit 14 = low order bit);
v set to '7'' indicates that the received frame which caused rejection was a response;
w set to "I" indicates that the control field received and returned in bits I through 8 are invalid or not
implemented;
x set to "I" indicates that the control field received and returned in bits 1 through 8 was considcrcd invalid
because the frame contained an information field which is not permitted with this command. Bit w must be set to
"1" in conjunction with this bit;
y set to "1" indicates that the information field received exceeded the maximum information field length which
can be accommodated by the station reporting the error condition. This bit is mutually exclusive with bits w and x
above;
z set to "1" indicates that the control field received and returned in bits 1 through 8 contained, an invalid N(R)
count. This bit is mutually exclusive with bit w.
1 8
rejected basic control field
8.6.4.3.2 N(S) sequence error: An N(S) sequence excep- sequence error, only one "sent RW exception condition, from
tion shall be established in the receiving station when an one station to another station, shall be established at a time. A
I-frame that is received error free (no FCS error) contains an "sent REJ" exception shall be cleared when thc requested
N(S) sequence number that is not equal to the receive variable I-frame is received. A station receiving REJ shall initiate
V(R) at the receiving station. The receiving station shall not sequential (re)transmission of I-frames starting with the
acknowledge (shall not increment its rec~iveva riable V(R)) the I-frame indicated by the N(R) contained in the REJ frame.
frame causing the sequence error, or any I-frames which may
follow, until an &frame with the correct N(S) number is
received. A station that receives one or more I-frames having 8.6.4.3.2.1.2 In the event a receiving station, due to a
sequence errors, but which are otherwise error free, shall transmission error, does not receive (or receives and discards)
accept the control information contained in the N(R) field and a single I-frame or the last Lframe(s) in a sequence of
I-frames, it shall not detect an out-of-sequence exception and,
the P/F bit to perform link control functions, e-g. to receive
therefore, shall not transmit REJ. The station which transmitted
acknowledgement of previously transmitted I-frames (via the
A'(/?)), to cause the station to respond (P bit set to "I"). the unacknowledged I-frame(s) shall, following the completion
of a system-specified time-out period, take appropriate
9
0
.. -
8.6.4.3.2.1 The means specified in 8.6.4.3.2.1.1 and recovery action to determine the sequence number at which
8.6.4.3.2.1.2b elow shall. be available for initiating- the retrans- retransmission must begin.
mission of lost or errored I-frames Following the occurrence of
a sequence error. 8.6.4.3.2.1.3 Recommendation.- A combined station
which has timed out waitingfor u response should not retrans-
8.6-4.3.2.1.1 Where the REI commandlrespotlse is used mit all unacknowledgedfrumes irnnzediat~ly. The sfatinn may
to initiate an exception rccovery following the detection of a enquire about status with a supervisolyfrarne.
10 12
vf s)
711 1/96
No. 71
13
v
14 16
VfR)
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