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Mode S packets into single SLM on ELM frame, the following XDLP, the following procedure shall be used.
procedures shall be used. Multiplexing of the packets within
the ADLP shall not be applied to packets associated with 5.2.2.3.3,2 Procedure
SVCs of different priorities.
Note I.- SLM and ELM transactions can occur
Note.- Multiplexing is not perfanned on MSP packets. independently-
5.2.2.3.2.1 Multiplexing optimization
Note 2.- Uplink and downlink transactions can occur
independently.
Recommendation.- When multiple packets are awaiting 5.2.2.3.3.2.1 SLMframes. SLM frames awaiting transfer
transfer to the same XDLR thty should be multiplexed into a shall be transmitted in the order received.
single frame in order to optimize throughput, provided that
packets associated with SVCs of diflerent priorities are not 5.2.2.3.3.2.2 ELMframs. ELM frames awaiting transfer
multiplexed togethel: shall be transmitted in the order received.
5.2.2.3.2.2 Structure. The structure of the multiplexed
packets shall be as follows: 5.2.2.4 GDLP FRAME PROCESSING
5.2.2.4.1 GENERAPLR OVISIONS
5.2.2.4.1.1 The GDLP shall determine the data link
Note,- A numbet in the field signifies the field length in capability of the ADLP/transponder installation from the data
bits; "v" signifies that the field is of variable length. link capability report (5.2.9) before performing any data link
activity with that ADLP.
5.2.2.3.2.2.1 Multiplexing header. The header for the
multiplexed packets shall be as follows: 5.2.2.4.1.2 GDLP frame processing shall provide to the
interrogator all data for the uplink transmission that is not
provided directly by the interrogator.
Where,
Data packet type (DP) = 0
MSP packet type (MP) = 1
Supervisory packet (SP) = 3
Supervisory type, (ST) = 2
Note.- See Figure 5-23 for a definition for the field
structure used in the multiplexing headel:
5.2.2.3.2.2.2 Length. This field shall contain the length
of the following packet in bytes.
5.2.2.3.2.3 Termination. The end of a frame containing
a sequence of multiplexed packets shall be determined by one
of the following events:
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.
5.2.2.4.3 Aircraft address. GDLP frame processing shall
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 transfeming 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
p1otocol.
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume 111
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 ;is 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 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 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 provided 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 tha~ 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 (II) code of
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