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association of the packets. Messages longer than 151 bytes
shall be discarded. The interrogator shall provide a delivery
notice to the Mode S specific services interface(s) indicating
successful or unsuccessful delivery, for each uplinkcd packet.
5.2.7.2.2 DOWNLINK PROCESSING
5.2.7.2.2.1. Specific services capability. The GDLP shall
be capable of receiving Mode S specific services messages
from the interrogator via frame processing.
5.2.7.2.2.2 Broadcast processing. If the received message
is a broadcast Comm-B, as indicated by the
interrogatorJGDLP interface, the GDLP shall:
a) generate control data indicating the presence of a
broadcast message and the 24-bit address of the
aircraft from which the message was received;
b) append the 7-byte MB field of the broadcast Comm-B:
and
5.2.7.2 GDLP PROCESSING
5.2.7.2.1.1 Speci'c services capability. The GDLP shall
be capable of receiving control and message data from the
Mode S specific services interface(s) (5.2.3.2.2) and sending
delivery notices to the interface(s). The control data shall be
processed to deteimine the protocol type and the length of the
message data.
5.2.7.2.1.2 Broadcastprocessing. The GDLP shall determine
the interrogator(s), broadcast azimuths and scan times
from the control data and use the message data to specify the
MA field of a Comm-A broadcast message for transfer to the
interrogator(s).
5.2.7.2.1.3 GICBprocessing. The GDLP shall determine
thc rcgister number and the aircraft address from the control
data. The aircraft address and GICB register number shall be
passed to the interrogator as a rcquest for a ground-initiated
Comm-B.
5.2.7.2.1.4 MSP processing. The GDLP shall extract
from the control data the message length, the MSP channel
number (WCH) and the aircraft address, and obtain the
message content from the message data. If the message length
is 27 bytes or less, the SSE shall format a Comm-A message
c) forward this data to the Mode S specific services
interface(s) (5.2.3.2.2).
5.2.7.2.2.3 GlCB processing. If the received message is
a GICB, as indicated by the interrogator1GDLP interface, the
GDLP shall:
a) generate control data indicating the presence of a
GICB message, the register number and the 24-bit
address of the aircraft from which the message was
received;
b) append the 7-byte MB field of the GICB; and
c) forward this data to the Mode S specific services
interface(s) (5.2.3.2.2).
5.2.7.2.2.4 MSP prucessing. If the received message is
an MSP as indicated by the packet format header (5.2.7.31, the
GDLP shall:
a) generate control data indicating the transfer of an
MSP, the length of the message, the MSP channel
number (M/CH) and the 24-bit address of the aircraft
from which the message was received;
b) append the user data field of the received MSP packet;
and
7/11/96
No. 71
Part 1 Annex 10 - Aeronautical Telecommunications
C) forward this data to the Mode S specific services sequences. The first packet in an L-bit sequence shall be
interface(s) (5.2.3.2.2). assigned a sequence number of 0. Subsequent packets shall he
numbered sequentially. A packet received with the same
L-bit processing shall be performed as specified in 5.2.7.4. sequence number as the previously received packet shall be
discarded.
5.2.7.3 MSP PACKET FORMATS 5.2.7.4 L-bit processing. L-bit processing shall be
performed only on the long form MSP packet and shall be
5.2.7.3.1 Short form MSP packet. The format for this performed as specified for M-bit processing (5.2.5.1.4.1)
packet shall be as follows: except as specified in the following paragraphs.
5.2.7.4.1 Upon receipt of a long form MSP packet, the
XDLP shall construct the user data field by: M/CH:6
5.2.7.3.1 -1 Data packet type (DP). This field shall be set a) verifying that the packet order is correct using the
to 0. MISN field (5.2.7.3.2);
'5.2.7.3.1.2 MSPpacket type (MP). This field shall be set b) assuming that the user data field in the MSP packet is
to 0. the largest number of integral bytes that is contained
5.2.7.3.1 -3 MSPchannel number(M/CH). The field shall within the frame;
be set to the channel number derived from the SSE control c) associating each user data field in an MSP packet
data. received with a previous user data field in an MSP
FILLI: 0 or 6
5.2.7.3.1.4 Fill field (FILL]: 0 or 6). The fill length
UD:v
packet that has an L-bit value of 1;
shall be 6 bits for a downlink SLM frame. Otherwise the fill d) truncating the assembled user data field to 151 bytes
length shall be 0. (in the ADLP) and 159 bytes (in the GDLP) if
　
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