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4.1.3.1.1 There shall be a P channel and an R channel
P, and R,,, capability which perform system management
functions for each satellite service area.
4.1.3.1.2 For the case where there is one transmit channel
unit shared between the R and T channels, R channel
transmissions shall be delayed, whenever necessary, to avoid
interrupting a T channel transmission.
4.1.3.2 Level 1. An AES with Level 1 capability shall
have the capabilities for:
a) receiving and processing data on one P channel at
channel rates of 0.6 and 1.2 kbitsls; and
b) processing and transmitting data on one R channel and
on one T channel at channel rates of 0.6 and 1.2 kbitsls.
Simultaneous transmission on the R channel and the T channel
shall not be required.
4.1.3.2.1 An AES with Level 1 capability shall receive
and process continuously the assigned P channel once logged
on with the GES to enable receipt of AES-addressed messages
and respond to GES commands.
4.1.3.2.2 Recommendation.- An AES with Level I
capability should have the capabilities described in 4.1.3.2 for
the additional channel rate of 2.4 kbits/s.
Note.- An AES with Level I capability provides basic
packet mode data communications based on the open system
interconnection rnodel to suppo~ aviation safety
communications. An AES with Level I capabili~re quires o~le
receive channel and one transmit channel.
4.1.3.3 Ltrvel 2. An AES with Level 2 capability shall
have the capabilities for:
a) receiving and processing data on one P channel at
channel rates of 0.6 and 10.5 kbitsfs; and
b) processing and transmitting data on one R channel and
on one T channel at channel rates of 0.6 and 10.5 kbits/s.
Simultaneous transmission on the R channel and the T channel
shall not be required. Simultaneous reception on more than
one P channel shall not be required.
4.1.3.3.1 Recommendation.- An AES with LRvel 2
capabili~sh ould have the capabilities described in 4.1.3.3 a)
for the additional channel rate of 4.8 kbits/s.
4.1.3.4 Level 3. An AES with Level 3 capability shall
provide the capabilities for:
a) an AES with Level 2 capability; and
b) receiving, processing and transmitting digital
information on one C channel at a channel rate of 8.4 or
21.0 kbitsls.
Simultaneous operation of the C channel with either the R
channel or the T channel shall not be required.
4.2.3.4.1 Recommendation.- Level 3 channel capability
should be provided at channel rates of 5.25, 6.0 and 10.5
kbirds.
Note.- An AES with Level 3 capabiliiy provides digitized
voice capability on a C channel in addition to the Level 2
packet mode data capability. Preemption requirements are
described in Sections 4.8 and 4.9. Two receive channels and
one transmit channel are required.
4.1.3.5 Level 4. An AES with Level 4 capability shall
provide the capabilities for:
a) an AES with Level 3 capability;
b) simultaneous operation of a C channel with the R
channel; and
c) simultaneous operation of the C channel with the T
channel.
Simultaneous operation of the three channels (C, R and T)
shall not be required.
4.1.3.5.2 Recommendation.- Level 4 channel capability
should be provided at channel rates of 5.25. 6.0 and 10.5
kbits/s.
Note.- An AES with Level 4 capability provides digitized
voice capability on a C channel simultaneously with packet
mode dcira capability on the R channel or the T channeL Two
receive channels and two transmit channels are required.
4.1.3.5.2 Recommendation.- A Level 4 AES should he
capable of simultaneous R and T channel transmissions
whenever the C diannel is not it1 use.
2/X1/00
No. 75
Annex 10 - Aeronautical Telecommunications Volume IId
4.2 BROADBAND RF
CHARACTERISTICS
4.2.1 Frequency bands
Note.- Categories of messages, and their relative priorities
within the aeronautical mobile (R) service, are given in
Annex .lo, Volume 11, 5.1.8. These categories and prioiities are
equally valid for the aemnautical mobile (R) satellite service
(see ITU Radio Regulation No. 3651).
4.2.1.1.1 Every aircraft earth station and ground eaah
station shall be designed to ensure that messages defined in
Annex 10, Volume II, 5.1.8 are not delayed by the transmission
andlor reception of other types of messages employing
frequencies within the bands stated in 4.2.1.2 and 4.2.1.3 or
other frequencies to which the station can tune. Message types
not defined in Annex 10, Volume H, 5.1.8 shall be terminated
if necessary, and without warning, to allow Annex 10, Volume
II, 5.1.8 type messages to be transmitted and received.
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