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and procedures
6.8.2.1 Thc VDL Mode 3 shall use the advanced
multiband excitation (AMBE) 4.8 kbilsls encodingldecoding
algori~hm, version number AMBE-ATC-10, developed by
Digital Voice Systems, Incorporated (DVSI) for voicc
communications.
Note I.- Informutiorz on technicul churacteristics of the
4.8 kbits/s AMBE algorithm is contained in AMBE-ATC-I0
Low h v e l Description, obtuinuble frorn DVSI.
Note 2,- The 4.8 kbirs/s AMBE encading/decoding
technology described irr the document IS subject to DVSIpatent
rights urzd copyrigh fs. Manufuchuers must enter into a
license agreement with DVSI prior to obtuining a detailed
description of the algorithm before incorporation in equipment
operating irz the VDL Mode 3 service By letter to ICAO dared
29 October 1999, DVSI confirn~ed its commitntenr to license
rhe technology for the manufacture and sale of aeronautical
equipment under reasonable terms and conditions, negotiuted
on a non-discriminatory basis.
6.8.2.2 Speech encoding definition, voice unit parameters,
6.8.1 Services and procedure descriptions for VDL Mode 3 Voice Unit
operation are contained in the Manual on VDL Mode 3
6.8.1.1 The voice unit shall provide for a simplex,
"push-to-talk" audio and signalling interface between the user
and the VDL. Two separate murually exclusive voice circuit
types shall be supported:
6.9 VDL MODE4
a) Dedicated circuits: This shall provide service to a 6.9.1 A Mode 4 station shall conform to the requirements
'pecific user group On an basis with sharing defined in sections 6.1.2.3, 6.1.4.2, 6.2.1.1, 6.2.3.1, 6.2.4,
of the circuit with other users outside the group. Access 6.3.1, 6.3-3. 6.3.4, 6.3.5 and 6.9.
shall he based on a "listen-before-push-to-talk"
discipline.
6.9.2 VDL Mode 4 radio channels
b) Demand assigned circuits: This shall provide voice
circuit access which is arbitrated by the ground station
in response to an access request received from the 6.9.2.1 VDL MODE 4 STATION FREQUENCY RANGE
aircraft station. This type of operation shall allow
dynamic sharing of the channel resource increasing 6.9.2.1.1 Transmitter/receiver tuning range. A VDL
trunking efficiency. Mode 4 transmitterlreceiver shall be capable of tuning to any
of the 25 kHz channels from 117.975 MHz through 137 MHz.
631.2 Priority uccess. The unit operation shall The transmitter shall have a means for the tuning range to be
support a priority override access for authorized ground users. a narrower range-
Note.- Operational conditions or certain qplications may
6'8.1.3 Message source idenf@ca'ion. The voice 'nit wguiw ,he equipment to be in a narmw,crjrequency
operation shall support notification to the user of the source of ,nge.
a received message (i.e. whether the message originated from
an air or ground station). 6.9.2.1.2 Recommendation.- A VWL Mode 4 transrnitter/
receiver should be capable of tuning to any of rhe 25 kHz
6.8.1.4 Coded squelch. The voice unit shall support a channels from 108 to 11 7.975 MHz.
coded squelch operation that offers some degree of rejeciion of
undesired co-channel voice messages based on the burst time Note.- The bund 108 - 11 7.975 MHz rnuy be utilized in
of arrival. some States for ADS applications.
1/11/01
No. 76
Annex 10 - Aeronautical Telecornrnunications Volume 112
6.9.2.1.3 Simultuneous reception. A VDL Mode 4 station 6.9.4 Coordination of channel utilization
shall be capable of receiving two channels simultaneously.
6.9.4.1 On a regional basis, transmissions shall be
6.9.2.1.4 ~ ~ ~ ~A v~m ~~~d~ 4 ~scariodn ~schedu~led reliative ~to UTC~, to e.nsure -efficie nt use of shared
should be capable of receiving additionul channels channels and to avoid unintcnlional slot re-use.
simulraneously as required by operutionul services.
6.9.5 Physical layer protocols and services
Note.- Unless otherwise stated, the requirements de$ned
in this section apply to both nzabile and gmund stations.
6.9.2.2.1 VDL Mode 4 stations shall use two assigned
frequencies as global signalling channels (GSC), to support
user communications and link management functions.
6.9.5.1 FUNCTIONS
Note.- Additional channels muy be defined in a local
domain and not$ed to mobile users by broadcast from ground 6.9.5.1.1 TRANSMITTED POWER
stations on the GSCs defined above.
6.9.5.1.1.1 Airborne installation. The effective radiated
power shall be such as to provide a field srrengrh of at least
6.9.3 System capabilities 35 microvolts per metre (minus 114.5 dJ3w/mZ) on the basis of
free space propagation, at ranges and altitudes appropriate to
6.9.3.1 ATN compatibi~iry~. h~ VDJ- M~~~ system shall the conditions pertaining to the areas over which the aircraft is
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