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PCS shall be the ones' complement of the remainder, R(x), tents before transmission, and shall insert a single 0 bit
obtained from the modulo 2 division of immediately following each sequence of 5 consecutive
by the CRC polynomial, P(x).
1 bits:
b) the receiving station shall examine the received frame
contents fox patterns consisting of 5 consecutive 1 bits
irnmediately~followed by one (or more) 0 bit(s) and
G(x) shall be the contents of the frame existing between, shall remove the 0 bit which directly follows 5 consebut
including neither, the final bit of the opcning Rag nor cutive 1 bits.
the first bit of the FCS, excluding bits inserted for
transparent transmission.
8.6.4.2.4 Special transmission sequences and related link
K shall be the length of G(x) (number of bits). stutes. In addition to employing the prescribed repertoire of
commands and responses to manage the interchange of data
8.6.4.2.2.4 The generation md checking of the FCS and control information, stations shall use the following conaccumulation
shall be as follows: ventions to signal the indicated conditions:
a) the transmitting station shall initiate the 1;%S accumulation
with the first (least significant) bit of the address
(A) field and shall include all bits up to and including
the last bit preceding the FCS sequence, but shall
exclude all 0 bits (if any) inserted to achieve transparent
transmission:
b) upon completion of the accumulation the FCS shall be
transmitted, starting with bit bl (highest order
coefficient) and proceeding in sequence to bit b16
(lowest order coefficient) as shown below;
transmittbeidt 1
a) Abort is the procedure by which a station in the
process of sending a frame ends the frame in an
unusual manner such that the receiving station shall
ignore the frame. The conventions for aborting a frame
shall be:
1) transmitting at least seven, but less than fifteen,
one bits (with no inserted zeros);
2) receiving seven one bits.
c)
the receiving station shall carry out the cyclic
redundancy check (CRC) on thc content of the frame
commencing with the first bit received following the
opening flag, and shall include all bits up to and
including the last bit preceding the closing flag, but a)
shall exclude all 0 bits (if any) deleted according to
the rules for achievement of transparency;
b) Active link state. A link is in an active state when a
station is transmitting a frame, an abort sequence, or
interframe time fill. When the link is in the active
state, the right of the transmitting station to conti'nue
transmission shall be reserved.
Interframe time $11. Interframe time fill shall be
accomplished by transmitting continuous flags between
frames. There is no provision for time fill within a
frame.
Idle link state. A link is in an idle state when a continuous
one condition is detected that persists for 15 bit
times, or longer. Idle link time fill shall be a continuous
one condition on the link.
d) upon completion of the FCS accumulation, the
receiving station shall examine the remainder. h the e) Invalid frame. An invalid frame is one that is not
absence of transmission error, he remainder shall be properly bounded by two flags or one which is shorter
1111OOOO10111OOO (x" through x15, respectively). ihan 32 bits between flags.
7/11/96
No. 71
Annex 10 - Aeronau tical Telec~mmunications
Table 8-5. Control field formats
Volume III
8.6.4.2.5.1 Operational mode. The operational mode
shall be the asynchronous balanced mode (ABM).
Control field format for
Information transfer (I frame)
Supervisory commands/rcsponses (S frame)
Unnumbered conimands/responses
8.6.4.2.5.1.1 It shall be permissible for a combined
station in ABM to lransmit without invitation from the
associated station.
8.6.4.2.5.1.2 A combined station in ABM shall be permitted
to transmit any command or response type frame except
DM.
where:
NIX) = send sequence count (bit 2 = low order bit)
N(R) = reccive sequence count (bit 6 = low order bit)
S = supcrvisory function bits
M = modifier function bits
P = poll bit (in commands)
F = final bit (in responses)
Control field bits
8-6.4.2.5.2 Nun-operatiorzal mode. The non-operational
mode shall be the asynchronous disconnected mode (ADM) in
which a combined station is logically disconnected from the
data link.
1.
0
1
1
8.6.4.2.5.2.1 It shall be permissible for a combined station
in ADM to lransmit without invilaliori from the associated
station.
8.6.4.2.5.2.2 A combined station in ADM shall transmit
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