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Annex 10 - Aerolzautical Telecommunicntions
FIGURE FOR CHAPTER 3
Note I.- Shading indicates elements outside the scope of these SARPs. User requirements define the intelface between the
application enrity and rhe user and ensure the functionaliry and interoperabiliry of the ATN.
Nore 2,- The figure represenls a simplified model of the ATN and does nor depict all of its capabilities (e.8. the srore and forward
capability which is for ATS message handling service).
Nore 3.- Various end-to-end points have been defined within rhe ATN to specifi certair~ end-to-end performance requirements. It
may be necessary, howevel; to define dzferenr end-to-end points to.facilitare the qualification of implemeritations to rhose petj%rmance
requirernenrs. In such cases, the end-to-end points should be clearly defined and correlated with the end-to-end points shown in r h ~
fi6u re-
Nore 4.- An IS is a coriceplual represenlarion of functionality and does not correspond precisely to A muter A router which
implements the system management application requires h e protocols of an end system and when using the system management
appliculion is also acting as an end system.
Figure 3-1. Conceptual model of the ATN
1/11/U1
No. 76
End system (ES)
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Part I Annex 10 - Aeronautical Telecomrnuhicatio~~
4.1.3 System capabilities
Note.- A system providing aeronautical mobile-satellite
service (AMSS) comprises the AES, the satellite and the GES.
A Level 1 (2, 3 or 4) system consists of an AES with Level I
(2, 3 or 4) capability with one or more satellites and one or
more GESs having the capabilities to operate compatibly with
all capabilities of the AES. Multiple service providers of such
systems may coexist. A basic level of interoperability among
digerent systems is provided.
4.1.3.1 Scope. A level of system capability shall include
the performance of the AES, the satellite and the GES. All
AESs, as a minimum, shall have a Level 1 capability and shall
continuously monitor the P channel after log-on to the GES.
Each GES shall provide at all times when operating AMS(R)S,
a Level 1 capability as a minimum.
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 1
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 1 capability provides basic
packet mode data communications based on the open system
interconnection model to support aviation safety
communications. An AES with Level 1 capability requires one
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