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associated with an airborne data link processor (ADLP). It Comm-D replies, each containing the 80-bit Comm-D
operates a protocol unique to Mode S data link for data message field (MD).
r-ransfer between air and ground.
Frame. The basic unit of transfer at the link level. In the
Capability report. Information identifying whether the trans- context of Mode S subnetwork, a frame can include from
ponder has a data link capability as reported in the capa- one to four Cornm-A or Comm-B segments, from two to
bility (CA) ficld of an all-call reply or squitter trans- sixteen Comm-C segments, or from one to sixteen Commmission
(see "data link capability report"). D segments.
Close-out. A command from a Mode S interrogator that
terminates a Mode S link layer communication transaction.
Cluster of interrogators. Two or more interrogators with the
same interrogator identifier (11) code, operating co-operatively
to ensure that there is no interference to tlie
required surveillance and data link performance of each of
the interrogators, in areas of common coverage.
Comm-A. .4 11 2-bit interrogation containing the 56-bit MA
message field. This field is used by the uplink standard
length message (SLM) and broadcast protocols.
Grorrnd data circuit-terminating equipment (GDCE). A
ground specific dala 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. Mode S), and which provides channel mmagemenr,
and segments andlox reassembles messages for
transler. It is connected on one side (by mcans of its DCE)
to ground elements common to all dala link systems, and
on the other side to the air-ground link ilself.
Comrn-B. A 112-bit reply containing the 56-bit MB message Ground-initiatedprotocol. A procedure initiated by a M0de.S
field. This field is used by the downlink SLM, ground- interrogator for deIivering standard Length or extended
initiated and broadcast protocols. length messages to a Mode S aircraft installation.
Cornrn-C. A 112-bit interrogation containing the 80-bit MC Mode S air-initiated Comm-B (AlCB) protocol. A procedure
message field. This field is wed by the uplink cxrended initjated by a Mode S transponder for transmitting a singIc
leng~hm essage (ELM) protocol. Cornnl-B segment from the aircraft installation.
7/11/96
No. 71 218 ANNEX 10 - VOLUME III
Annex 10 - Aeronautical Telecommunications
Mode S broadcast protocols. Procedures allowing standard
length uplink or downlink messages to be received by
more than one transponder or ground interrogator
respectively.
Mode S ground-inihhted Comm-B (GZCB) protocol. A
procedure initiated by a Mode S interrogator for eliciting
a single Comm-B segment from a Mode S aircraft installation,
incorporating the contents of one of 255 Comm-B
registers within the Mode S transponder.
Mode S rnultisite-directedprotocol. A procedure to ensure that
extraction and close-out of a downIink standard length or
extended length message is affected only by the particular
Mode S interrogator selected by the aircraft.
Mode S packet. A packet conforming to the Mode S subnetwork
standard, designed to minimize the bandwidth
required from the air-ground link. IS0 8208 packets may
be transformed into Mode S packets and vice-versa.
Mode S specijc protocol (MSP). A protocol that provides
restricted datagram service within the Mode S subnetwork.
Mode S spec@c 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 XDEP to provide access to the Mode S specific
services.
Segment. A portion of a message that can be accommodated
within a single MAMB field in thc case of a standard
length message, or MC/MD field in the case of an
extended length message. This term is also applied to the
Mode S transmissions containing these fields.
Standard length message {SLM). An exchange of digital data
using selectively addressed Comm-A interrogations andlor
Comm-B replies (see "Comm-A and "Comm-B").
Subnetwork management enti0 {SNME). An entity resident
within a GDLP that performs subnetwork management and
communicates with peer entities in intermediate or endsystems.
llmeout. The cancellation of a transaction after one of the
participating entities has failed to provide a required
　
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