Home' RTCA Documents for Review : DO-343B Contents © RTCA, 2018
COMMUNICATION SERVICE PROVIDER REQUIREMENTS
To facilitate the pro-forma compliance matrices required for the system-
specific attachments to this generic system-level requirement document,
the system-level performance requirements in Section 2.3 are presented
in tabular form.
The AMS(R)S system SHALL meet all pertinent airworthiness, human factors and
operational requirements including alerts, controls and frequency management
Requirements relating to carriage of AMS(R)S equipment on aircraft and
implementation of ground infrastructure supporting AMS(R)S SHALL be in accordance
with national requirements, regional agreements or international agreements, including
the level of system capability, as appropriate for Air Traffic Service operations and
Aeronautical Operational Control. This document anticipates that different AES
requirements may apply to AMS(R)S offered through different satellite subnetworks.
STANDARD OPERATING CONDITIONS
When measured at the CSP interfaces (Points A and H of FIGURE 1-4), the standard
operating conditions for data, and voice communications SHALL be as established by
relevant national or regional ANSP. For the purpose of this document, such operating
conditions should include the maximum number of aircraft in the operational airspace,
the average data rates to and from an operational aircraft using the AMS(R)S service,
the average call demand (Erlang) loading for cockpit voice services, and the maximum
burst data rate required for an individual aircraft.
For the purposes of delay measurement, the standard data message SHALL consist of
one block of 220 octets of user input data of controller or pilot-defined information for
ACARS and 1024 octets for ATN/OSI, along with associated checksums and protocol
headers defined by the satellite network and other intermediate systems within the SSP
and CNP subsystems.
The AMS(R)S system SHALL meet its requirements under the defined traffic
The intent of the standard data message definition is to establish a design
condition for system delay. There is no requirement to partition longer
transactions into 220 /1024 octet segments. Verification will use actual
The AMS(R)S system SHALL meet its requirements for aircraft in normal flight
configurations while operating in airspace, controlled by procedural separation or ATS
surveillance means. Refer to Section 1.7 for the definitions.
The airspace relevant to the specific satellite subnetwork included in the
overall CNP network will be the intersection of all airspace with the
geographical coverage volume of the relevant satellite system. There is
no requirement on the minimum or maximum coverage volume to be
provided by the satellite system, but it is expected that any such volume
will be a substantial fraction of the Earth’s surface.
Radio Frequency Spectrum
When providing AMS(R)S communications, the satellite subnetwork of an AMS(R)S
system SHALL operate only in frequency bands which are appropriately allocated to
AMS(R)S and protected by the ITU Radio Regulations.
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