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Note.- Mode S specific services consist of the broadcast
Comm-A and Comm-B. GICB and MSP
5.2.3.2.1 ADLP
5.2.3.2.1.1 General provisions. The ADLP shall support
the accessing of Mode S specific services through the
provision of onc or more separate ADLP interfaces for this
purpose.
5.2.3.2.1.2 Functional capability. Message and control
coding via this interface shall support all of the capabilities
spccilicd in 5.2.7.1.
5.2.3.2.2 GDLP
The ADLP shall also accept the I1 code of the inlerrogator
used to transmit lhe surveillance, Comm-A or uplink ELM.
Note.- Transponders will not output all-call and ACAS
information on this interfcLce.
5.2.3.3.1.2 The ADLP shall accept control information
from the transponder indicating the status of downlink
transfers. This shall include:
a) Comm-B close-out;
b) Comm-B broadcast timeout; and
c) downlink ELM close-out.
5.2.3.3.1.3 The ADLP shall have access to current
information defining the communication capability of the
Mode S transponder with which it is operating. This
information shall be used to generate the data link capability
report (5.2.9).
5~2~3.3.2A DLP TO TRANSPONDER
5.2.3.3.2.1 The ADLP shall provide an indicat~on of
protocol type to the transponder in connection with data
transferred from the ADLP to the transponder. This shall
include the following types of protocols:
a) ground-initiated Comm-B;
5.2.3.2.2.1 General provisions. The GDLP shall support b) air-initiated Comm-B;
the accessing of Modc S specific services through the
provision of a separate GDLP interface for this purpose andlor c) multisite-directed Comm-B;
by providing access to these services through the DTEIDCE
interface. d) Comm-B broadcast;
5.2.3.2.2.2 Filnctional capability. Message and control e) downlink ELM; and
coding via this interface shall support all of the capabilities
specified in 5.2.7.2. f) multisite-directed downlink ELM
2811 1/02
Nn. 77
Annex 10 - Aeronautical Telecommunications Volume III
The ADLP shall also provide the I1 code for transfer of a
multisite-directed Comm-B or downlink ELM and the
Comm-B data selector (BDS) code (3.1.2.6.1 1.2 of Annex 10,
Volume IV) for a ground-initiated Comm-B.
5.2.3.3.2.2 The ADLP shall be able to perform frame
cancellation as specified in 5.2.2.5.5.
5.2.3.4 GDLPNoDE S INTERROGATOR INTERFACE
5.2.3.4.1 INTERROGATOR TO GDLP
5.2.3.4.1.1 The GDLP shall accept an indication of
protocol type from the interrogator in connection with data
transferred from the interrogator to the GDLP. This shall
include the following types of protocols:
a) ground-initiated Cornrn-B;
b) air-initiated Comrn-B;
c) air-initiated Comrn-B broadcast; and
d) downlink ELM.
The GDLP shall also accept the BDS code used to identify the
ground-initiated Comm-B segment.
5.2.3.4.1.2 The GDLP shall accept control information
from the interrogator indicating the status of uplink transfers
and the status of the addressed Mode S aircraft.
5.2.3.4.2 GDLP to interrogator: The GDLP shall provide
an indication of protocol type to the interrogator in connection
with data transferred from the GDLP to the interrogator. This
shall include the following types of protocols:
a) Comm-A interrogation;
b) Comm-A broadcast interrogation;
c) uplink ELM; and
d) ground-initiated Comm-B request.
The GDLP shall also provide the BDS code for the groundinitiated
Cornrn-B protocol.
5.2.4 DCE operation
Note.- The DCE process within the XDLP acts as a peer
process to the DTE. The DCE supports the operations of the
DTE with the capability specified in 5.2.3.1.4. The following
req~tirenients do not spec& format definitions andflow control
oil the DTEIDCE i~zte@ace.T lie spec~ficationsa nd definitionc
in IS0 8208 apply for these cases.
5.2.4.1 State transitions. The DCE shall operate as a
state machine. Upon entering a state, the DCE shall perform
the actions specified in Table 5-2. State transitions and
additional action(s) shall, be as specified in Table 5-3 through
Table 5- 12.
Note.- The next state transition ( i f any) that occurs when
the DCE receives a packet from the DTE is specified by
Table 5-3 through Table 5-8. These tables are organized
according to the hierarchy illustrated in Figure 5-2. The same
transitions are defned in Table 5-9 through Table 5-12 when
the DCE receives a packet from the XDCE (via the
rejormatting process).
5.2.4.2 DISF'OSlTION OF PACKETS
5.2.4.2.1 Upon receipt of a packet from the DTE, the
packct shall be forwarded or not forwarded to the XDCE (via
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