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receive channel and one transmit channel.
4.1.3.3 Level 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 kbitsls; and
b) processing and transmitting data on one R channel and
on one T channel at channel rates of 0.6 and 10.5 kbitsls.
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 Level 2
capability should have the capabilities described in 4.1.3.3 a)
for the additional channel rate of 4.8 kbitds.
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 kbitsts.
Simultaneous operation of the C channel with either the R
channel or the T channel shall not be required.
4.1.3.4.1 Recommendation.- Level 3 channel capability
should be provided ~t channel rates of 5.25, 6.0 and 10.5
kbitS/S.
Note.- An AES with Level 3 capability provides digitized
voice capability on a C channel in addition to the Level 2
packet mode data capability. Pre-emption 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.
4.1.3.5.1 Recommendation.- Level 4 channel capability
should be provided at channel rates of 5.25, 6.0 and 10.5
kbitds.
Note.- An AES with Level 4 capability provides digitized
voice capability on a C channel simultaneously with packet
mode data 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 be
capable of simultaneous R and T channel transmissions
whenever the C channel is not in use.
2/XUOO
No. 75
Annex 10 - Aeronautical Telecommunications Volume 111
4.2 BROADBAND RF
CHARACTERISTICS
4.2.1 Frequency bands
4.2.1.1 USE OF AMS(R)S BANDS
Note.- Use of the band 1 645.5 to 1 646.5 MHz by rnobilesatellite
services is limited to distress and safety operations.
4.2.1.3.2 Recommendation.- The aircrafi earth station
should be capable of traltsmitting in the frequency band
1 656.5 to 1 660.5 MHz.
Note.- The band 1 656.5 to 1 660.5 MHz may be protected
Note.- Categories of messages, and their relative priorities and utilized by some statesfo r national and international
within the aemnautical mobile (R) service, are given in A M S ( R ) S ~ ~ ~ ~ ~ ~ ~ ~ .
Annex 10. Volume 11, 5.1.8. These categories and priorities are
equally valid far the aeronautical mobile-satellite (R) service 4.2.1.3.3 Recommendation.- The aimrufi earth station
(see ITU Radio Re&ulations Article $44). should also be capable of transmitting in the frequency band
1 626.5 to 1 645.5 MHz.
4.2.1.1.1 Every aircraft earth station and ground earth
station shall be designed to ensure that messages defined in
Annex 10, Volume 11, 5.1.8 are not delayed by the transmission Note.- The band 1626.5 to 1645.5 MHz may be used to
andlor reception of other types of messages employing communicate for purposes of distress and public corresponfrequencies
within the bands stated in 4.2.1.2 and 4.2.1.3 or dence with stations of the maritime mobile-satellite service in
other frequencies to which the station can tune. Message types accordance with ITU Radio Regulations Article S41.
not defined in Annex 10, Volume 11, 5.1.8 shall be terminated
if necessary, and without warning,. to allow Annex 10,
Volume 11, 5.1.8 type messages to be transmitted and received.
4.2.1.4 TUNING INCREMENTS
Note.- See lTU Radio Regulations No. S5.357A.
4.2.1.4.1 Channels shall be allocated throughout the
bands in increments of 2.5 kHz, for the to- and from-aircraft
transmission path.
4.2.1.2 TO-AIRCRAFT
4.2.1.4.2 Channel assignment and tuning of the aircraft
4.2.1-2.1 The aircraft earth station shall be capable of earth station shall be achieved under control from the GES.
receiving in the frequency band 1 544 to 1 555 MHz.
Note.- Use o f the band 1544 to 1545 MHz by mobile
satellite services is limited to distress and safety operations.
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