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length message, or MCIMD 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
Ground-initiatedprotocol. A procedure initiated by a Mode S using selectively addressed Comm-A interrogations andlor
interrogator for delivering standard length or extended Comm-B replies (see "Comm-A" and "Comm-B").
length messages to a Mode S aircraft installation.
Subnetwork. An actual implementation of a data network that
Mode S air-initiated Comm-B (AICB) protocol. A procedure employs a homogeneous protocol and addressing plan, and
initiated by a Mode S transponder for transmitting a single is under the control of a single authority.
Comm-B segment from the aircraft installation.
Subnetwork managemenl entify (SNME). An entily resident
Mode S broadcast protocols. Procedures allowing standard within a GDLP that performs subnetwork management and
length uplink or downlink messages to be received by communicates with peer entities in intermediate or endmore
than one transponder or ground interrogator systems.
respectively.
Mode S ground-initiated Comm-B (GICB) 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-directed protocol. A procedure to ensure
that extraction and close-out of a downlink standard length
or extended length message is affected only by the
particular Mode S interrogator selected by the aircraft.
Timeout. The cancellation of a transaction after one of the
participating entities has failed to provide a required
response within a pre-defined period of time.
Uplink. A term referring to the transmission of dab from the
ground to an aircraft. Mode S ground-to-air signals are
transmitted on the 1 030 MHz interrogation frequency
channel.
XDCE. A general term referring to both the ADCE and the
GDCE.
Mode S packet. A packet conforming to the Mode S sub- XDLP. A general term referring to both the ADLP and the
network standard, designed to minimize the bandwidth GDLP.
No. 77
Part Z Annex 10 - Aeronautical Telecommunications
5.2 MODE S SUBNETWORK positive binary notation and the first bit transmitted shall be
CHARACTERISTICS the most significant bit (MSB) (3.1.2.3.1.3 of Annex 10,
Volume IV).
5.2.1 General provisions 5.2.1.6 Unassign,ed bits. When the length of the data is
not sufficient to occupy all bit positions within a message field
Note 1.- Reference [SO document. When the term "IS0 or subfield, the unassigned bit positions shall be set to 0.
8208" is referred to in this standard, it means the IS0
Stundurd "Informution technology - Data comnzunications -
X.25 Packet h y e r Protocol for Data Terminal Eq~~ipment,
Reference Number ISO/IEC 8208: 1990(E)". 5.2.2 Frames
Note 2.- The overall architecture of the Mode S
subnetwork is presented in the diagram on the following page. 5.2.2.1 UPLINK FRAMES
5.2.2.1.1 SLM frunze. An uplink SLM frame shall be
Note 3.- The processing splits into three d~yerenpt ud~s.T he composed of up to four selectively addressed Comm-A
first consists of the processing of switched virtual circuits segments.
(SVCs), the second consists of tlze processing of Mode S specific
services, and the third consists of the processing of subnetwork
management information. SVCs utilize the reformatting process
and the ADCE or GDCE function. Mode S specific services
utilize the Mode S specific services entity (SSE) function.
5.2.1 .I Message categories. The Mode S subnetwork
shall only carry aeronautical communications classified under
categories of tlight safety and flight regularity as specified in
Annex 10, Volume 11, Chapter 5, 5.1 3.4 and 5.1.8.6.
5.2.1.2 Signuls in space. The signal-in-space characteristics
of the Mode S subnetwork shall conform to the
provisions contained in Annex 10, Volume IV, Chapter 3,
3.1.2.
5.2.1.3 Code and byte independency. The Mode S subnetwork
shall be capable of code and byte independent
transmission of digital data.
Note.- Eaclz Comm-A segzeizt (MA j?eld) received by the
ADLP is acconzpanied by the first 32 bits of the interrogation
that delivered the segment (3.1.2.10.5.2.1.1 of Annex 10,
Volume IV). Within these 32 bits is the 16-bir speciul
designator (SD) field (3.1.2.6.1.4 oj- Annex 10, Volume IV).
5.2.2.1.1.1 SD field. When the designator identification
(DI) field (bits 14-16) has a code value of 1 or 7, the special
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