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optional (0) for conformance to a particular communications
standard.
Service provider. An entity at a layer that provides services to
the layer above. These services are provided at service
access points through the use of service primitives.
Service user. An entity at a layer that makes use of the
services that are provided at service access points by the
layer below through the use of service primitives.
Subnetwork connection. A long-term association between an
aircraft DTE and a ground DTE using successive virtual
calls to maintain context across link handoffs.
VRL station. A VDL-capable entity. A VDL station may
either be an aircraft station or a ground station. A VDL
station is a physical entity that transmits and receives
frames over the air-ground interface and comprises, at a
minimum: a physical layer, medi,a access control sub-layer,
and a unique DLS address. The particular initiating
process (i.e. DLE or LME) in the VDL station cannot be
determined by the source DLS address. The particular
destination process cannot be determined by the destination
DLS address. These can only be determined by the
context of these frames as well as the current operational
state of the DLEs.
6.1.2 Radio channels and
functional channels
Subnetwork connection maintenance. The process by which 6.1.2.1 Aircraft station radio frequency range. An
the VDL SNDCF maintains subnetwork context from one aircraft shall be capable of tuning to any of the 760 25-kHz
subnetwork connection to the next during handoffs. channels from 11 8.000 MHz through 136.975 MHz within 100
milliseconds of the receipt of the autotune command.
Subnetwork connection management. The process by which
the VDL SNDCF initially establishes a connection and 6.1.2.2 Ground station radio frequency range. A ground
then maintains it during handoffs. station shall be capable of operating on its assigned channel
within the spectrum detailed in 6.1.2.1.
Subnetwork dependent convergence facility (SNDCF). A
facility that matches the characteristics and services of a
particular subnetwork to those characteristics and services
required by the internetwork facility.
Subnetwork entity. In this document, the phrase "ground
DCE" will be used for the subnetwork entity in a ground
station communicating with an aircraft; the phrase "ground
DTE" will be used for the subnetwork entity in a ground
router communicating with an aircraft station; and, the
phrase "aircraft DTE" will be used for the subnetwork
entity in an aircraft communicating with the station. A
subnetwork entity is a packet layer entity as defined in
IS0 8208.
Subnetwork layer. The layer that establishes, manages, and
terminates connectiolls across a subnetwork.
System. A VDL-capable entity. A system comprises one or
more stations and the associated VDL management entity.
A system may either be an aircraft system or a ground
system.
I: The baud period or llbaud rate.
Unicast. A transmission addressed to a single station.
VRL management entity. A VDL-specific entity that provides
the quality of service requested by the ATN-defined
SN-SME. A VME uses the LMEs (that it creates and
destroys) to enquire the quality of service available from
peer systems.
6.1.2.3 Common signalling channel. Frequency 136.975
MHz shall be used as a world-wide common signalling
channel (CSC) for VDL Mode 2 to announce the availability
of any VDL services.
6.1.3 System capabilities
The VDL communications functions shall meet the general
requirements in 6.1.3.1 through 6.1.3.4 below.
6.1.3.1 Data transparency. The VDL system shall
provide code-independent, byte-independent transfer of data.
6.1.3.2 Broadcast. The VDL system shall provide link
layer broadcast services.
6.1.3.3 Connection management. The VDL system shall
establish and maintain a reliable communications path between
the aircraft and the ground system while allowing but not
requiring manual intervention.
Note.- In this context "reliable" is dejined by the BER
requirement specified in 6.3.5.1.
6.1.3.4 Ground network transition. A VDL-equipped
aircraft shall transition from one ground station to another
when circumstances dictate.
6111WI
No. 72
Annex 10 - Aeronautical Telecommunications Volume ZII
6.1.4 Air-ground VHF digital Note.- Appendix 8 to the Radio Regulations ~otzt~itnhse
link communications tolerances for the levels of spurious emissions to which
system characteristics transmitters must conform in accordance with Radio Regulation
304.
6.1.4.1 The characteristics of the air-ground VHF digital
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