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receive from the interrogator along with the data in each
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 identificarion. GDLP
frame processing shall indicate to thc 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 derenninarion. A Mode S packct
(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 irarne 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 necessaly and
multiple SLM frames.
Note.- Tlze Mode S DATA, CALL REQUEST CALL
ACCEPT, CLEAR REQUEST and INTERRUPTpackets ure the
only Mode S packets that use M-bit or S-bit sequencing.
Note I.- SLM and ELM tmnsuctions can occur
independently.
5.2.2.5 ADLP FRAME PROCESSING
Note 2.- Uplink and downlink transactions can occur
independently.
5.2.2.3.3.2.1 SLM franzes. SLM frames awaiting transfer
shall be lransmitted in the order received.
5.2.2.3.3.2.2 ELM.frames. ELM frames awaiting transfer
shall be transmitted in the order received.
5.2.2.4 GDLP FKAME PROCESSING
5.2.2.4.1 GENERAPLR OVISIONS
5.2.2.4.1.1 The GDLP shall determine the data link
capability of the ADLPltransponder installation from the data
link capability report (5.2.9) before performing any data link
activity with that ADLP
5.2.2.4.1.2 GDLP framc processing shall provide to the
interrogator all data for the uplink transmission that are not
provided directly by the interrogator.
5.2.2.4.2 Delivery status. GDLP frame processing shall
accept an indication from the interrogator function that a
specified uplink frame that was previously transferred to the
interrogator has been successfully delivered over the groundto-
air link.
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 112-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 providcd directly by the transponder
(5.2.3.3).
5.2.2.5.2 Delivery 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 identifier: 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
processing shall transfer to the transponder the I1 code of thc
interrogator or cluster of inlerrogators lhat 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.
Annex 10 - Aeronautical Telecommunications Volume III
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
bc 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). IT
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