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ADLP is accompurzied 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-bit special
designator (SD)ji eld (3.1.2.6.1.4 of Annex 10, Volume W).
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
designator (SD) field (bits 17-32) of cach Comm-A interrogation
shall be used to obtain the interrogator identifier
subfield (TIS, bits 17-20) and the linked Comm-A subfield
(US, bits 30-32). The action to be taken shall depend on the
value of U S . The contents of LAS 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 U S field shall be as defined in 3.1.2 of
Annex 10, Volume IV.
Note.- The SD field structure is shown in Figure 5-1 *.
5.2.2.1.1.2 U S coding. The 3-bit U S subfield shall be
coded as follows:
U S MEANING
0 single segment
1 linked, 1st segment
2 linked, 2nd but not final segment
3 linked, 3rd but not final segment
4 linked, 4th and final segment
5 linked, 2nd and final segment
6 linked, 3rd and final segment
7 unassigned
5.2.2.1.1.3 Single segment SLMframe. If L4S = 0, the
data in the MA field shall be considered a complete frame and
shall be made available for further processing.
5.2.2.1.1.4 Multiple segment SLM frame. The ADLP
shall accept and assemble linked 56-bit Comm-A segments
associated with all sixteen possible interrogator identifier (IT)
codes. Correct linking of Comm-A segments shall be achieved
by requiring that all Comm-A segments have the same value
of IIS. If U S = 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 U S = 1, the MA field
shall be assembled as the initial segment of an SLM frarnc.
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
MA field shall be assembled in numerical order as an intermediate
segment of the SLM frame. It shall be associated with
previous segments containing the same value of 11s.
5.2.2.1.1.4.3 Final segment. If LAS = 4, 5 or 6, the MA
field shall be assemblcd as thc final segment of the SLM
frame. It shall be associated with previous segments containing
the same value of HS.
5.2.2.1.1.4.4 Frame completion. The frame shall be
considered complete and shall be made available for further
processing as soon as all segments of the frame have been
received.
5.2.2.1 .I .4.5 Frame cancellation. An incomplete SLM
frame shall be cancelled if one or more of the following
conditions apply:
a) a new initial segment ( U S = 1) is received with the
same value of IIS. In this case, the new initial segment
shall be retained as the initial segment of a new SLM
frame;
b) the sequence of received LAS codes (after the
elimination of duplicates) is not contained in the
following list:
1) LAS=O
2) U S = 1,5
3) LAS = 1,2,6
4) LAS = 1,6,2
5) LAS = 1,2,3,4
6) U S = 1,3,2,4
7) LAS = 1,2,4,3
8) US = 1,3,4,2
9) U S = 1,4,2,3
10) LAS = 1,4,3,2
c) Tc seconds have elapsed since the last Comm-A
segment with the same value of IIS was received
(Table 5- 1 *).
* All tables and figures are located at the end of this chapter.
7/11/96
221 No. 71
Annex 10 - Aeronautical Telecommunications Volume ZZZ
5.2.2.1.1.4.6 Segment cancellation. A received segment
for an SLM frame shall be discarded if it is an intermediate or
final segment and no initial segment has been received with
the same value of 11s.
5.2.2.1.1.4.7 Segment duplicution. If a received segment
duplicates a currently received segment number with the same
value of US, the new segment shall replace the currently
received segment.
Note.- The action of the Mode S subnetwork protocols
may result in the duplicate delivery of Comm-A segments.
5.2.2.1.2 ELM frame. An uplink ELM frame shall
consist of from 20 to 160 bytes and shall be transferred from
the interrogator to the transponder using the protocol defined
in 3.1.2.7 of Annex 10, Volume IV. The first 4 bits of each
uplink ELM segment (MC field) shall contain the interrogator
identifier (11) code of the Mode S interrogator transmitting the
ELM. The ADLP shall check the I1 code of each segment of
a completed uplink ELM. If all of the segments contain the
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