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response within a pre-defined period of time.
XDCE. A general term referring to both the ADCE and the
GDCE.
XDLP. A general term referring to both the ADLP and the
GDLP.
5.2 MODE S SUBNETWORK
CHARACTERISTICS
5.2.1 General provisions
Note 1.- Reference IS0 document. When the term "IS0
8208" is referred to in this standnrd, it menns the IS0
Standard "Iry50rmtion technology -Data cammunicutions -
X.25 Packer Layer Protocol for Data Terminal Equipment,
Reference Number ISOAEC 8208: 1990(E)".
Note 2.- The over-all architecture of the Mode S
subnetwork is presented in the diagram on the following page.
Note 3.- The processing splits into three diferent paths.
Thejirsf consists of the processing of switched virtual circuits
(SVCs), the second consists of the processing of Mode S
specific services, and the third consists of the processing of
subnetwork rnmagement information. SVCs utilize the
reformatting process and the ADCE or GDCEhnction. Mode
S specific services utilize the Mode S spec$c services entity
(SSE) function.
5.2.1.1 Message categories. The Mode S subnetwork
shall only carry aeronautical communications classified under
categories of flight safety and flight regularity as specified in
Annex 10, Volume II, Chapter 5, 5.1.8.4 and 5.1.8.6.
5.2.1.2 Signals 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 independenq. The Mode S subnetwork
shall be capable of code and byte independent
transmission of digital data.
5.2.1.4 Data transfer Data shall be conveyed over the
Mode S data link in segments using either standard length
message (SLM) protocols or extended length message (ELM)
protocols as defined in 3.1.2.6.11 and 3.1.2.7 of Annex 10,
Volume IV.
Note 1.- An SLM segment is the contents of one 56-bit
MA or MB field. An ELM segment is rhe contents of one 80-bit
MC or MD field.
Note 2.- An SLM frame is the contents of up to four
linked MA or MBfields. An ELM frame is the contents of 2 to
16 MC or 1 to 16 MD fields.
5.2.1.5 Bit numbering. In the description of the data
exchange fields, the bits shall be numbered in the order of
their transmission, beginning with bit 1. Bit numbers shall
coctinue through the second and higher segments of multisegment
frames. Unless otherwise stated, numerical values
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Annex 10 - Aeronautical Telecommunications Volume 111
Functional elements of the Mode S subnetwork
AIR
Tolfrorn end-sysrems
(see Notes 4 and 5)
SSE
DTE
interface
(5.2.3.2.1)
4
t
Mode S specific
services entity
W E )
IS0 8208
interface
I DCE (5.24) 1
I Mode S
Reformatting subnetwork
process (5.2.5.2) managcmcnt
entity (SNME)
ADCE (5.2.6) 4 - - - - I 4 (5.2.8)
GROUND
Tolfron~ end-systems
(see Notes 4 and 5)
IS0 8208
Packcr layer
protocol
SNME alternative
interface (5.2.8.2)
ATN router
----
-Mo-de - S p-ack et layer protocoT - "
DTE
o-de -S S-V-C f-ram e
Frame processing (5.2.2 and 5.2.7)
SSE
IS0 8208
interface
I DCE (5.2.4) 1
Mode S Mode S specific
(SSE)
entity (SNME)
Frame processing (5.2.2 and 5.2.7)
alternative
interface
I' 1 ,'
(5.2.3.3) Modc S link (5.2.3.4) $ (see Now 3)
I I +I INTERROGATOR
I 0 : physical (RF) connection
+ - - + : peer level association
4-b : interfaces
Notes:
1. Relevant Mode S subnetwork SARPs paragraph numbers are given in parenthesis.
2. The ADLPhransponder interface is also specified in Annex 10, Volume IV, 3.1.
3. A GDLP may be interfaced to more than one Mode S interrogator.
4. DTEs may be directly associated with end-systems.
5. ATN router access to end-systems may be made via other intermediate systems.
7/11/96
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Part I Annex 10 - Aeronautical Telecommunications
encoded by groups (fields) of bits shall be encoded using
positive binary notation and the first bit transmitted shall be
the most significant bit (MSB) (3.1.2.3.1.3 of Annex 10,
Volume IV).
5.2.1.6 Unassigned bits. When the length of the data is
not sufficient to occupy all bit positions within a message field
or subfield, the unassigned bit positions shall be set to 0.
5.2.2 Frames
5.2.2.1 UPLINK FRAMES
5.2.2.1.1 SLM frame. An uplink SLM frame shall be
composed of up ro four selectively addressed Comm-A
segments.
Note.- Each Comm-A segme~zt( MAf ield) received by the
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