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to solicit (poll) a response or sequcnce of responses
from the remote combined station.
h) The final (P/F) bit shall be used by the remote combined
station to indicate the response frame transmitted
as the result of a soliciting (poll) command.
i) The maximum number (k) of sequentially numbered
I-frames that a station may have outstanding (i.e.
unacknowledged) at any given time is a station parameter
which shall never exceed the modulus.
Note.- k is determined by statiorz buffering
lirnitatio~ls and should be the subject of bilateral
agreement at the time of circuit establishment.
8.6.4.2.7 Commands and responses. It shall be permissible
for a combined station to generate either commands or
responses. A command shall contain thc remote station address
while a response shall contain the sending station address. The
mnemonics associated with all of the commands and responses
prescribed for each of the three frame types (I, S, and U) and
the corresponding encoding of the control field are as shown
in Table 8-6.
8.6.4.2.7.1 The I-frame command provides the means for
transmitting sequentially numbered frames, each of which shall
be permitted to contain am information field.
8.6.4.2.7.2 The S-frame commands and tesponses shall
be used to perform numbered supervisory functions (such as
acknowledgement, polling, temporary suspension of information
transfer, or error recovery).
8.6.4.2.7.2.1 The receive ready command or response
(RR) shall be used by a station to:
a) indicate ihat it is ready to receive an I-frame;
b) acknowledge previously received I-frames numbcred
up to and including N(R) - 1;
c) clear a busy condition that was initiated by the
transmission of RNR.
Note.- It is pernzissible for a combined station to use the
RR command to solicit u response from the remote combined
station with the poll bit set to "1".
8.6.4.2.7.2.2 It shall be permissible to issue a reject
command or response (REJ) to request retransmission of
frames starting with the I-frame numbered N(R) where:
a) I-frames numbered N(R) - 1 and below are acknowledged;
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications
Table 8-6. Commands and responses
Volume ZZZ
b) additional I-Frames pending initial transmission are to 8 .6.4.2.7.2.3.1 Recommendation.-
be transmitted following the retransmitted I-frame(s);
Type
Information transfer
Supervisory
Unnumbered
c) only one REJ exception condition, from one given
station to another station, shall be established at any
given time: another REJ shall not be issued until the
first W exception condition has been cleared;
d) the REJ exception condition is cleared (reset) upon the
receipt of an I-frame with an N(S) count equal to the
N(R) of the REJ command/response.
Commands
1 (information)
RR (receive ready)
RNR (receive not ready)
REJ (reject)
SABM (set asynchronous
balanced mode)
DISC (disconnect)
8.6.4.2.7.2+3 Thc receive not ready command or
response (RNR) shall be used to indicate a busy condition, i.e.
temporary inability to accept additional incoming I-frames,
where:
a) frames numbered up to and including N(R) - 1 are
acknowledged;
R~sponses
RR (receive ready)
RNR (receive not ready)
REJ (reject)
DM (disconnected mode)
UA (unnumbered
acknowledgement)
FRMR (frame reject)
b) frame N(K) and any subsequent I-frames received, if
any, arc not acknowledged (the acceptance status of
these frames shall be indicated in subsequent
exchmges);
U) A station receivin,g an RNR jkme when in the process
qf transmitting should stop transnzitting I-frames at the
earliest possible time.
C field encoding
1 2 3 4 5 6 7 8
b) Any REJ command or response which was received
prior to the RNR should be acrioned before the termination
of transmission.
0 N(s)
1 0 O O
1 0 1 0
1 0 0 1
I 1 1 1
1 1 1 1
C) It should be permissiblefor a combined station to use
the RNR command with the poll bit set to "I" to
obtain a supervisory *me with the final bit set to "I"
@om the renrote combined station.
8.6.4.2.7.2.4 It shall be permissible for the selective
reject command or response (SRET) to be used to rcquest
retransmission of the single I-frame numbered N(R) where:
P
P/F
P/F
P/F
P/F
1 1 O O P O l O
1 1 O O F 1 1 O
1 1 I O F O O l
a) frames numbered up to N(R) - 1 are acknowledged;
frame N(R) is not accepted; the only I-frames accepted
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