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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 rare of 21.0 kbitsls.
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 at chamel 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 requirenzents are
described in Sections 4.8 and 4.9. Two receive channels and
one truhsmit chanizel 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 capabiliv
sholtld be provided at channel rates of 5.25, 6.0 ahd
10.5 kbits/s.
Note.- An AES wilh Level 4 capability provides digitized
voice capabiliry on a C channel simultaneouslv with packet
mode data capability on the R channel or the T channel. Two
receive channels and two rrarzsmit channels are required.
4.1.3.5.2 Recommendation.- A Level 4 AES should be
capable of simultaneous R and T charznel trans~nissions
whenever the C channel is not in use.
Annex 10 - Aeronautical Telecommunications Volume ZZZ
4.2 BROADBAND RJ!
CHARACTERISTICS
4.2.1 Frequency ban&
4.2.1 .I USE OF AMS(R)S BANDS
Note.- Categories of messages, and their relative
priorities within the aeronautical mobile (R) service, are given
in Annex 10, Volume 11, 5.1.8. These categaries and priorities
are equally vulid for the aeronautical mobile (R) satellite
service (see ITU Radio Regulation No. 36511.
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 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 11, 5.1 .8 shall be terminated
if necessary, and without warning, to allow Annex 10,
Volume K5.1.8 type messages to be transmitted and received.
Note.- See ITU Radio Regulations, Article 8, No. 729A.
4.2.1 2 . 1 The aircraft earth station shall be capable of
receiving in the frequency band 1 544 to 1 555 MHz,
Note.- Use of the band 1 544 to 1 545 MHz by mobile
satellite services is limited to distress und safety operations.
4.2.1.2.2 Recommendation.- The aircrafi earth station
should be capuble of receiving in the frequency band 1 555 fo
1 559 MHz.
Note.- The band 1 555 to 1 559 MHz muy be protected
and utilized by some States for national and international
AMS(R)S purposes.
4.2.1.2.3 Recommendation.- The aircraft earth station
should also be capable o f receiving in the frequency band
1 525 to 1 544 MHz.
Note.- The band 1 525 to I 544 MHz may be used to
con~n~unicaftoer purposes of distress and public correspondence
with stations of the maritime mobile-satellite service in
accordance with No. 3571 of the ITU Radio Regulations.
4.2.1.3.1 The aircraft earth station shall bc capable of
transmitting in the frequency band 1 645.5 to 1 656.5 MHz.
Nore.- Use of the band 1 645.5 to 1 646.5 MHz by
mobile-satellite services is limited to distress and safety
operations.
4.2.1.3.2 Recommendation.- The ainzraft earth stution
should be capable of transmittirtg in the frequency band
I 656.5 to 1 660.5 MHz.
Note.- The band 1 656.5 to 1 660.5 MHz may be
protected and utilized by some States for national and international
AMS(R)S purposes.
4.2.1 -3.3 Recommendation.- The aircraft earth station
should also be capable of transmitting in the frequency band
1 626.5 to 1 645.5 MHz.
Nore.- The band 1 626.5 to 1 645.5 MHz may be used to
communicate for purposes of distress and public correspondence
with stafions of the maritime mobile-satellite service
in accordunce with No. 3571 of the ITU Radio Regulations.
4.2.1.4 TUNINGIN CREMENTS
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.
4.2.1.4.2 Channel assignment and tuning of the aircraft
earth station shall be achieved under control from the GES.
　
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