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downlink SLM or ELM frame, the 24-bit address of the
aircraft that transmitted the frame. GDLP frame processing
shall be capable of transferring to the interrogator the 24-bit
address of the aircraft that is to receive an uplink SLM or
ELM frame.
5.2.2.4.4 Mode S protocol type identijication. GDLP
frame processing shall indicate to the interrogator the protocol
to be used to transfer the frame: standard length message
protocol, extended length message protocol ,or broadcast
protocol.
5.2.2.4.5 Frame determination. A Mode S packet
(including multiplexed packets but excluding MSP packets)
intended for uplink and less than or equal to 28 bytes shall be
sent as an SLM frame. A Mode S packet greater than 28 bytes
shall be sent as an uplink ELM frame for transponders with
ELM capability, using M-bit processing as necessary
(5.2.5.1.4.1). If the transponder does not have ELM capability,
packets greater than 28 bytes shall be sent using the M-bit or
S-bit (5.2.5.1.4.2) assembly procedures as necessary and
multiple SLM frames.
Note.- The Mode S DATA, CALL REQUEST, CALL
ACCEPT, CLEAR REQUEST and INTERRUPT packets are .
the only Mode S packets that use M-bit or S-bit sequencing.
5.2.2.5.5 Frame cancellation. ADLP frame processing
shall be capable of cancelling downlink frames previously
transferred to the transponder for transmission but for which
a close-out has not been indicated. If more than one frame is
stored within the transponder, the cancellation procedure shall
be capable of cancelling the stored frames selectively.
5.2.2.5.6 Frame determination. A Mode S packet
(including multiplexed packets but excluding MSP packets)
intended for downlink and less than or equal to 222 bits shall
be sent as an SLM frame. A Mode S packet greater than 222
bits shall be sent as a downlink ELM frame for transponders
with ELM capability using M-bit processing as necessary
(5.2.5.1.4.1). When M-bit processing is used, all ELM frames
containing M = 1 shall contain the maximum number of ELM
segments that the transponder is capable of transmitting in
response to one requesting interrogation (UF = 24) (5.2.9.1).
If the transponder does not have ELM capability, packets
greater than 222 bits shall be sent using the M-bit or S-bit
(5.2.5.1.4.2) assembly procedures and multiple SLM frames.
Note.- The nraximum length of a downlink SWM frame is
222 bits. This is equal to 28 bytes (7 bytes for 4 Comm-B
segments) minus the 2-bit linked Comm-B sub$eld
(5.2.2.2.1.1).
5.2.2.6 PRIORITY MANAGEMENT
5.2.2.5 ADLP FRAME PROCESSING
5.2.2.5.1 General provisions. With the possible exception
of the last 24 bits (addresslparity), ADLP frame processing
shall accept from the transponder the entire content of both
56-bit and 1 12-bit received uplink transmissions, excluding allcall
and ACAS interrogations. ADLP frame processing shall
provide to the transponder all data for the downlink
transmission that is not provided directly by the transponder
(5.2.3.3).
5.2.2.5.2 Delively status. ADLP frame processing shall
accept an indication from the transponder that a specified
downlink frame that was previously transferred to the transponder
has been closed out.
5.2.2.5.3 Interrogator identijier; ADLP frame processing
shall accept from the transponder, along with the data in each
uplink SLM and ELM, the interrogator identifier (11) code of
the interrogator that transmitted the frame. ADLP frame
proccssing shall transfer to the transponder the II code of the
interrogator or cluster of interrogators that shall receive a
multisite-directed frame.
5.2.2.5.4 Mode S protocol type identification. ADLP
frame processing shall indicate to the transponder the protocol
to be used to transfer the frame: ground-initiated, air-initiated,
broadcast, multisite-directed, standard length or extended
length.
5.2.2.6.1 ADU priority management. Frames shall be
transferred from the ADLP to the transponder in the following
order of priority (highest first):
a) Mode S specific services;
b) search requests (5.2.8.1);
C) frames containing only high priority SVC packets; and
d) frames containing only low priority SVC packets.
5.2.2.6.2 GDLP priority management
Recommendation.- Uplink frames should be transferred
in the following order of priority (highestfirst):
a) Mode S specific services;
b) frames containing at least one Mode S ROUTE
packet (5.2.8.1);
c) frames containing at least one high priority SVC
packet; and
d) frames containing only low priority SVC packets*
5/11/98
No. 73
Annex 10 - Aeronautical Telecommunications
　
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