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capabilities:
a) expedited data delivery, i.e. the use of INTERRUPT
packets with a user data field of up to 32 bytes;
Other IS0 8208 facilities and the D-bit and the Q-bit shall not
be invoked for transfer over the Mode S packet layer protocol.
5.2.3.1.4.2 Pumrnzter values. The timer and counter
parameters for the DTE/DCE interface shall conform to the
default IS0 8208 values.
5.2.3.2 MODE S SPECIFIC
SERVICES INTERFACE
Note.- Mode S spec@ services consist of the broadcast
Comm-A and Comm-3. GICB and MSP
5.2.3.2.1 ADLP
5.2.3.2.1.1 General The ADLP shall support
the accessing of Mode S specific services through the provision
of one 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
specified in 5.2.7.1.
5.2.3.2.2 GDLP
5.2.3.2.2.1 Ceneralprovisions. The GDLP shall support
the accessing of Mode S specific services through the provision
of a separate GDLP interface for this purpose andlor by
providing access to these services through the DTE/DCE
interface.
5.2.3.2.2.2 Functional capability. Message and control
coding via this interface shall support all of the capabilities
specified in 5.2.7.2.
5.2.3.3 ADLP~RANSPONDEINRT ERFACE
5.2.3.3.1 TRANSPONDETOR A DLP
5.2.3.3.1.1 The ADLP shall accept an indication of
protocol type from the transponder in C O M ~ C ~w~itOh ~da ta
transferred from the transponder to the ADLP. This shall
include the following types of protocols:
a) surveillance interrogation;
b) Comm-A interrogation;
c) Comm-A broadcast interrogation; and
d) uplink ELM.
b) priority facility (with two levels, 5.2.5.2.1.1.6); and
c) fast select (5.2.5.2.1.1.13, 5.2.5.2.1.1.16).
The ADLP shall also accept the I1 code of the interrogator
used to transmit the surveillance, Comm-A or uplink ELM.
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume III
Note.- Transponders will not ouput all-call and ACAS
information on this inte$ace.
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 time-out; and
c) downlink ELM close-out.
5.2.3.3.1.3 The ADLP shall have access to information
dcfining the communication capability of the Mode S transponder
with which it is operating. This information shall be
uscd to generate the data link capability report (5.2.9).
5.2.3.3.2 ADLP TO TRANSPONDER
5.2.3.3.2.1 The ADLP shall provide an indication 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;
b) air-initiated Comm-B;
c) multisite-directed Comm-B;
d) Comm-B broadcast;
e) downlink ELM; and
f) multisite-directed downlink ELM.
The ADLP shall also provide the II code for transfer of a
multisite-directed Comm-B or downlink ELM and the Comm-
B data selector (BDS) code (3.1.2.6.11.2 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 GDLP/MODE S INTERROGATOR INTERFACE
5.2.3.4.1 INTERROGATOTRO 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 Comm-B;
b) air-initiated Comm-B;
c) air-initiated Comm-B broadcast; and
dj 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 interrogatol: 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;
bj 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
Comm-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 operatiorls of the
DTE with the capability spec$ed in 5.2.3.1.4. The following
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