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interleaver to the number of bits required to be transmitted on
the channel.
4.2.6 To facilitate the re-synchronization of an AES
transferring from one P channel. to another on the same GES,
all P channels transmitted by the same GES are synchronized.
43 R channel
4.3.1 Geneml. All AESs will log on to AMSS using an R
channel that has been designated for that purpose in the
particular service area of the AES. For the duration of its
bg-on period an AES will be assigned one or more R channels
(at the appropriate channel rates). Over these R channels, the
AES can transmit signalling, short data packets, and requests
for additional capacity on the T channel. The burst mode data
channel characteristics for the R channel have been specified
in th2 AMSS SARPs as has been the slot structure used for its
No. 75
Athzchment A to PaH I Annex 10 - Aeronwtieal Teleconrmunk~ns
slotted-ALOHA random access protocol. The functional 4.4.2 T chunnel format. The T channel burst length can
blocks at the transmit (AES) end of each channel are as vary from 2 to 31 signal units. The number of columns used
follows: in the interleaver varies with the transmission bit rate and the
burst length according to the AMSS SARPs. Each burst
a) data scrambler; includes a special short signal unit, the burst identifier, which
ensures that the originating AES and &stination GES are
b) FEC encoder; always known. If a GES receives a burst in which the burst
identifier is lost, absent or indicates a different OES, the GES
c) interleaver, would discard the burst.
d) preamble and unique word generator; and 4.4.3 T c h n e l tmnsmit timing. The T channel is also
synchronized to the P channel superframe, but in this case the
e) modulator. superframe is subdivided into 1 024 slots of approximately 7.8
milliseconds. The shortest guard time between the burst of two
The functional blocks at the receive end of each R channel are different AESs is under control of the receiving GES and is set
complementary to those at the transmit end. The complete to approximately 39 milliseconds (5 slots).
series of functional blocks form transmit end to receive end is
shown in Figure A-12 of this guidance material.
4.3.2 R channel tmnsrnit timing. The R channel transmits 4.5 C channel
in slots detived from the P channel superframe. The R channel
slot length varies according to the channel bit rate. The start of 4.5.1 General. The C channel is a circuit-made channel
any given R ~halhllels lot is referenced to leading edge of used for digital voice or data communications. A C channel
the first bit in the P channel format identifier field. An R can be requested by an AES over the R channel, and assigned
channel h s t may begin at an integer number of slot durations by the GES over the P channel. The functional blocks at the
after this time. For the R channel, the nominal starting instant transmit end of each C channel are as follows:
of the first bit of the preamble is the beginning of the slot.
a) interfaces for primary (e.g. voice) and sub-band channel;
4.4 T channel
4.4.1 Geneml. For the duration of its log-on period an
AES will be assigned one or more T channel frequencies (at
the appropriate channel rates). These channels are shared with
a number of other AESs on a demand-assigned basis. That is,
these channels are assigned on a conflict-free basis to
individual AESs by the GES for short periods of time. The
requests for T channel capacity can be made over the R
channel, or over the T channet, if capacity has already been
assigned. The burst mode data channel characteristics for the
T channel have been specified in the SARPs, as has been the
slot structure used for its reservation TDMA protocol. The
functional blocks at the transmit (MSe)nd of each channel
are as follows:
a) data scrambler;
b) FEC encoder;
c) interleaver;
d) preamble and unique word generator; and
e) modulator.
The functional blocks at the receive end of each T channel are
complementary to hose at the transmit end. The complete
series of functional blocks form transmit end to receive end is
shown in Figure A-12 of this guidance material.
b) primary channelhub-band channel data multiplexor;
c) data scrambler;
d) FEC encoder (unless it is not used);
e) interleaver (unless FEC is not used);
f) preamble and unique word generator; and
g) modulator.
The functional blocks at the receive end of each C channel are
complementary to those at the transmit end. The complete
series of functional blocks from transmit end to receive end is
shown in Figure A- 13 of this guidance material.
4.5.1.1 The C channel has been specified at a number of
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