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designator (SD) field (bits 17-32) of each Comm-A
interrogation shall be used to obtain the interrogator identifier
subfield (IIS, bits 17-20) and the linked Comm-A subfield
(US, bits 30-32). The action to be taken shall depend on the
value of US. The contents of US and IIS shall be retained
and shall be associated with the Comm-A message segment for
use in assembling the frame as indicated below. All fields
other than the LAS field shall be as defined in 3.1.2 of
Annex 10, Volume IV.
Note.- The SDfisld structure is shown in Figure 5-1 *.
5.2.1.4 Data rransfer; Data shall be conveyed over the
Mode S data link in segments using either standard length 5.2.2.1.1.2 LAS coding. The 3-bit U S subfield shall be
message (SLM) protocols or extended length message (ELM) as
protocb~s as defined in 3.1.2.6.1 1 and 3.1.2.7 of Annex 10,
Volume IV. LAS MEANING
0 single segment
Note 1.- An SLM segment is the contents of one 56-bit MA 1 linked, 1st segment
or MB,field. An ELM segment is the contents of one 80-bit MC 2 linked, 2nd but not final segment
or MD field. 3 linked, 3rd but not final segment
4 linked, 4th and final segment
Note 2.- An SLM frame is the contents of up to four linked 5 linked, 2nd and final segment
MA or MBfields. An ELM frame is th,e contents of 2 to I6 MC 6 linked, 3rd and final segment
or I to 16 MD fields. 7 unassigned
5.2.1.5 Bit numbering. In the description of the data 5.2.2.1.1.3 Single segment SLM frame. If LAS = 0, the
exchange fields, the bits shall be numbered in the order of data in the MA field shall be considered a complete frame and
their transmission, beginning with bit 1. Bit numbers shall shall be made available for further processing.
continue through the second and higher segments of multisegmcnt
frames. Unless otherwise stared, numerical values
encoded by groups (fields) of bits shall be encoded using * All tables and figures are located at thc end of this chapter.
2811 1/02
No. 77
Annex 10 - Aeronautical Xelecommunications
Functional elements of the Mode S subnetwork
Volume I11
2811 1/02
No. 77
AIR GROUND
'Totfrom cnd-systems 'Toifrom cnd-systems
(see Notes 4 and 5) (see Notes 4 and 5)
t t
ATN router IS0 8208
Packet layer
Kl-N router
protocol
DTE - - - - - - - DTE
A
SSE
A SSE
intcrfacc IS0 8208 SNME alten~ativc IS0 8208 alternative
il~tcrface
(5.2.3.2.1) interface interface (5.2.8.2) interface (5.2.3.2.2)
A (5.2.3.1) A (5.2.3.1)
f f
n c(5~.2.4 )
v
DCE (5.2.4)
7
-+
A
D
L
P
L
(5.2.3.3) Mode S link (5.2.3.4) 4 (sce Note 3)
T'RANSPONDEK JN1'EKKOGA'I'OR I
Key
& : physical (RF) connection
+-----b : peer level association
: interfaces
Notes:
1. Relevant Mode S subnetwork SARPs paragraph numbers are given in parenthesis.
2. The ADLPltransponder 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.
F
Modc S packet layer - - - - - - - - -
prorocol
Mo-de- S- S-VC- f-ra-me s
%d ~ o dsc s pccirZ
frames
Mode S
subnetwork
management
entity (SNME)
- - - - - - .
(5.2.8)
Mode S specific
scrviccs cntil?
(SSE)
(5.2.7.1)
4--
G
D
I,
P
J
Frame processin2 (5.2.2 and 3.2.7)
Reformatting
process (5.2.5.2)
ADCE(5.2.6)+
Mode S specific
scrviccs entity
(SSEi
(5.2.7.2)
Mode S
subnchvork
manaEcment
entity (SNME)
- - - - - - -
(5.2.8)
Frame processing (5.2.2 and 5.2.7)
~ ~ f ~ ~ ~ ~ g i ~ ~
process (5.2.j .2)
.
GDCE (5.2.6)
Part 1 Annex 10 - Aeronaulical Telecominui~ications
5.2.2.1.1.4 Mc~ltiples egmsrzt SLM franze. The ADLP shall
accept and assemble linked 56-bit Comm-A segments
associated with all sixteen possible interrogator identifier (11)
codes. Correct linking of Comm-A segments shall be achieved
by requiring that all Comm-A segments have the same value
of 11s. If LAS = 1 through 6, the frame shall consist of two to
four Comm-A segments as specified in the following
paragraphs.
5.2.2.1.1.4.1 Initial segment. If LAS = I, the MA field
shall be assembled as the initial segment of an SLM frame.
The initial segment shall be stored until all segments of the
frame have been received or the frame is cancelled.
5.2.2.1.1.4.2 Intermediate segment. If LAS = 2 or 3, the
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