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be 64 transmission bits, while the number of columns shall be
5. Row interchanging in the interleaver shall be performed in
accordance with 4.4.2.2.5.3,
4.4.3.4 Performance. The Standard in 4.4.2.3 shall
apply.
Annex I0 - Aeronautical TeEecommunicah'ons Volume IIZ
4.4.4 T channel
4.4.4.1 Channel rate accuracy. The channel rate error
shall not exceed one part in 2R, where R is the channel, rate,
and one part in lo4.
4.4,.4.2 Timing relative to P channel. The begmning of
each T channel burst shall occur within -+300ps of the
beginning of the assigned T channel slot defined by the
received P channel superframe. As shown in Figure 4-7, each
P channel superframe shall be divided into 16 nominal frames
with 64 T channel slots in each frame. The shortest guard time
between the T channel bursts of two different aircraft is under
control of the GES and shall be 5 slots.
be 64 transmission bits, while the number of columns shall
depend on the data rate as shown in Table 4-13. At the
transmitter the output of the convolutional encoder shall be
written into the 64-bit columns, until the specified number of
columns are full. The interleaver row interchange algorithm
shall be in accordance with 4.4.2.2.5.3.
4.4.4.4 Perfbrmnce. The Standard in 4.4.2.3 shall
apply.
4.4.5 C channel
4.4.5.1 Channel rate accuracy. The channel rate emr
shall not exceed one part in 2R, where R is the channel rate,
and one part in lo4.
4.4.4.3 BURST STRUCTURE
4.4.4.3. I General characteristics. Each T channel burst
shall consist of three fields: the preamble, the unique word and
the information field as shown in Figure 4-8.
4.4.4.3.2 Preamble, The Standard in 4.4.3.3.2 shall
apply.
4.4.4.3.3 Unique word. The Standard in 4.4.2.2.6 shall
apply.
4.4.4.3.4 Informutionfield. The information field of each
T channel burst shall consist of a burst identifier, n SUs and
3 6 flush bits prior to convolutiond encoding, as follows.
Burst identifier - this field has 48 bits which shall
identify the originating aircraft and the destination GES,
n $Us - from 2 to 31 standard length signal units of 96
bits each, and
Flush - a field of 16 bits (dl 0s) to flush out the
convolutional encoder.
The information field shall be scrambled, coded and interleaved,
in that order.
4.4.4.3.4.1 Scrambling. The Standard in 4.4.2.2.5.1 shall
apply, except that the scrambler shall be re-initialized at the
beginning of the information field of each burst.
4.4.4.3.4.2 Forward error correction (FEC) coding. The
Standard in 4.4.2.2.5.2 shall. apply, except that the convolutional
encoder shall be initialized to the all 0s state at the
beginning of the information field of each burst.
4.4.4.3.4.3 hzterleaving. All T channels shall employ
block interleaving. The number of rows in the interleaver shall
4.4.5.2 TRANSMISSIOFONR MATS
4.4.5.2.1 Preamble. The preamble for the C channel
shall consist of an unmodulated carrier portion followed by a
modulated portion. The length of these shall depend on the
channel rate as shown in Table 4-34 as applicable to the
system capability levels defined in 4.1.3. The preamble shall
be as described in the text of 4.4.3.3.2 and in Table 4-14.
4+4.5.2.2 Postamble. The postamble of the C channel
shall consist of continuous "0"s on the I channel, and alternating
"0 and "I" (commencing with "0") on the Q channel.
The length of the postamble shall be equivalent to a single
interleaver block for channels with interleaving, and 96 bits for
channels without interleaving.
4.4.5.2.3 To-aircraft. The C channel shall operate in
burst mode in the to-aircraft direction. In this mode, the C
channel burst shall consist of a preamble followed by a series
of contiguous frames followed by a postamble. Each frame
shall consist of three fields: the unique word, a dummy field
and the information field, as in Figures 4-9 and 4-10. Each
frame shall be 500 rns long.
4.4.5.2.4 From-aircraft. The C channel shall operate in
continuous mode in the from-aircraft direction. Each transmission
shall begin with the preamble described in 4.4.5.2.1.
In this mode, the C channel frame shall consist of three fields:
the unique word, a dummy field and the information field as
in Figures 4-9 and 4-10. Each frame shall be 500 ms long.
Note.- In the P, R and T channels the information field
refers to the information bits crfier forward error correction
coding. With the C ch.anne1 the infomation field m y or may
not include coding depending upon the particular C chan.nel
WPe.
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