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(e.g. Mode S) and which provides channel management, field. This field is used by the downlink ELM protocol.
and segments andlor reassembles messages for transfer. It is
connecred to one side of aircraft elem&ts common to all Connection, A logical association between peer-level entities
data link systems and on the other side to the air-ground in a communication system.
link itself.
Data link capability report. Information in a Comm-B reply
Aircraft address. A unique combination of 24 bits available identifying the complete Mode S communications capabilifor
assignment to an aircraft for the purpose of air-ground ties of the aircraft installation.
communications, navigation and surveillance.
Aircraf?/vehicle. May be used to describe either a machine or
device capable of atmospheric flight, or a vehicle on the
airport surface movement area (i.e. runways and taxiways).
BDS Comrn-B Data Selector. The 8-bit BDS code determines
the register whose contents are to be transferred in the MB
field of a Comm-B reply. It is expressed in two groups of
4 bits each, BDSl (most signiticant 4 bits) and BDS2 (least
significant 4 bits).
Broadcast. The protocol within thc Mode S system that
permits uplink messages to be sent to all aircraft in
coverage area, and downlink messages to be made available
to all interrogators that have the aircraft wishing to send the
message under surveillance.
Capability report. Information identifying whether the
transponder has a data link capability as reported in the
Downlink. A term referring to the transmission of data from an
aircraft to thc ground. Mode S air-to-ground signals are
transmitted on the 1 090 MHz reply frequency channel.
Extended length message (ELM). A series of Comm-C
interrogations (uplink ELM) lransmitled without the
requirement for intervening replies, or a series of Comm-D
replies (downlink ELM) transmitted without intervening
inlerrogations.
Uplink ELM (UELM).A term referring to extended length
uplink communication by means of 11 2-bit Mode S
Comm-C interrogations, each containing the 80-bit
Comm-C message field (MC).
Downlink ELM (DELM). A tenn referring to extendcd
length downlink communication by means of 1 12-bit
Mode S Comm-D replies, each containing the 80-bit
Comm-D message lield (MD).
ANNEX 10 - VOLUME 111 5-1 2811 1102
No. 77
Annex 10 - Aeronautical Telecommunications Volume 221
Frame. The basic unit of transfer at the link level. In the
context of Mode S subnetwork, a frame can include from
one to four Comm-A or Comm-B segments, from two to
sixteen Comm-C segments, or from one to sixteen Comm-
D segments.
General formatter/manager (GFM). The aircraft function
responsible for formatting messages to be inserted in the
transponder registers. It is also responsible for detecting and
handling error conditions such as the loss of input data.
Ground data circus-terminating equbment (GDCE). A
ground specific data circuit-terminating equipment
associated with a ground data link processor (GDLP). It
operates a protocol unique to Mode S data link for data
transfer between air and ground.
Ground data link processor (GDLP). A ground-resident
processor that is specific to a particular air-ground data link
(e.g. Modc S), and which provides channel management,
and segmcnts andlor reassemblcs messages for transfer. It is
connected on one side (by means of its DCE) to ground
elements common to all data link systems, and on the other
side to the air-ground link itself.
Ground-initiated Comm-B (GICB). The ground-initiated
Comm-B protocol allows h c interrogator to extract
Comm-B replies containing data from a defined source in
the MB field.
required from the air-ground link. IS0 8208 packets may be
transformed into Mode S packets and vice-versa.
Mode S specific protocol (MSP). A protocol that provides
restricted datagram service within the Mode S subnetwork.
Mode S specific services. A set of communication services
provided by the Mode S system which are not available
from other air-ground subnetworks, and therefore not
interoperable.
Mode S specific services entity (SSE). An entity resident
within an XDLP to provide access to the Mode S specific
services.
Packet. The basic unit of data transfer among communication
devices within the network layer, (e.g. an IS0 8208 packet
or a Mode S packet).
Required navigation performance (RNP). A statement of the
navigation performance accuracy necessary for operation
within a defined airspace.
Segment. A portion of a message that can be accommodated
within a single MNMB field in the case of a standard
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