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MA field shall be assembled in numerical order as an
intermediate segmenr of the SLM frame. It shall be associated
with previous segments containing the same value of IIS.
5.2.2.1.1.4.3 Fin,al segment. If U S = 4, 5 or 6, the MA
field shall be assembled as the final segment of the SLM
frame. It shall be associated with previous segments containing
the same value of 11s.
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.
5.2.2.1.1.4.5 Frame cancellation. An incomplete SLM
frame shall be cancelled if one or more of the following
conditions apply:
a) a new initial segment (LAS = 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 U S codes (after the
elimination of duplicates) is not coi~tained in [he
following list:
5 2 2~1. 1.4.6 Segment cancellation. A received segmcnt
for an SLM framc shall be discardccl if it is an internlediale or
final segment and no initial segment has been rcceived with the
same value of IIS.
5.2.2.1.1.4.7 Segment duplication. It' a received segment
duplicates a currently received segment number with the same
value of IIS, the new segment shall replace the currently
received segment.
Note.- The action of tlze Mode S subnetwork protocols
may result in the duplicate delivery of Conwz-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 compleled uplink ELM. If all of the segments contain the
same I1 code, the 11 code in each segment shall be deleted and
the remaining message bits retained as user data for further
processing. If all of the segments do not contain the same I1
codc, the entire uplink ELM shall be discarded.
Note.- An uplink ELM frarne consists of two to sixteen
associated Comm-C segments, each of which contains the 4-bit
II code. Therefore, the capaciry for packet transfer is 19 to 152
bytes per uplink ELM frame.
5.2.2.2 DOWNLINFKR AMES
5.2.2.2.1 SLM frame. A downlink SLM frame shall be
composed of up to 4 Comm-B segments. The MB field of the
first Comm-B segment of the frame shall contain a 2-bit linked
Comm-B subfield (LBS, bits 1 and 2 of the MB field). This
subfield shall be used to control linking of up to four Comm-
B segments.
Note.- The LBS uses the jirst 2-hit positions in the first
segment of a multi or single segment downlink SLM ,franze.
Hence, 54 bits ure available for Mode S packet data iiz rlzeflrst
segment of a downlink SLM frame. The remaining segments qf
the downlink SLM frame, if any, have 56 hits available.
5.2.2.2.1.1 LBS coding. Linking shall be indicated by the
coding of the LBS subfield of the ME field of the initial
Comm-B segment of the SEM frame.
The coding of LBS shall be as follows:
LBS MEANING
0 single segment
c) Tc seconds have elapsed since the last Comm-A 1 initial segmcnl of a two-segment SLM frame
segment with the same value of IIS was received 2 initial segment of a three-segment SLM frame
(Table 5-1). 3 initial segment of a four-segmenl SLM frame
28/11/02
No. 77
Annex 10 - Aeronautical Telecommunications Volume 111
5.2.2.2.1.2 Linking protocol
5.2.2.2.1.2.1 In the Comm-B protocol, the initial segment
shall be transmitted using the air-initiated or multisite-directed
protocols. The EBS field of the initial segment shall indicate
to the ground the number of additional segments to be
transferred (if any). Before the transmission of the initial
segment to the transponder, the remaining segments of the
SLM frame (if any) shall be transferred to thc transponder for
transmission lo the interrogator using the ground-initiated
Comm-B protocol. These segments shall be accompanied by
control codes that cause the segments to be inserted in groundinitiated
Comm-B registers 2, 3 or 4, associated respectively
with the second, third, or fourth segment of the frame.
5.2.2.2.1.2.2 Close-out of the air-initiated segment that
initiated the protocol shall not be performed until all segments
have been successfully transferred.
Note.- The linking procedure including the use of the
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