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the user data field of the received MSP packet shall be
forwarded to the Mode S specific services interface (5.2.3.2.1)
together with the MSP channel number (MICH), the US
subfield (5.2.2.1.1.1) together with control data that identifies
this as an MSP message. L-bit processing shall be performed
as specified in 5.2.7.4. The assignment of uplink MSP channel
numbers shall be as specified in Table 5-25.
5.2.7.2 GDLP PRWESSING
5.2.7.2.1.1 Specific 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 determine 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 GICBpmcessing. The GDLP shall determine
the register number and the aircraft address from the control
data. The aircraft address and GICB register number shall be
passed to the interrogator as a request 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 (MICH) 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
for transfer to the interrogator using the short form MSP
packet (5.2.7.3.1). If the message length is 28 to 151 bytes and
the transponder has uplink ELM capability, the SSE shall
format an ELM message for transfer to the interrogator using
the short form MSP packet. If the message length is 28 to 151
bytes and the transponder does not have uplink ELM
capability, the SSE shall fonnat multiple long form MSP
packets (5.2.7.3.2) utilizing the L-bit and the M/SN fields for
association of the packets. Messages longer than 151 bytes
shall bc discarded. The interrogator shall provide a delivery
notice to the Mode S specific services interface(s) indicating
successful or unsuccessful delivery, for each uplinked packet.
5.2.7.2.2 DOWNLINPKR OCESSING
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.
511 U98
No. 73
Part I Annex 10 - Aeronautical Telecommunications
5.2.7.2.2.2 Broadcast processing. If the received message
is a broadcast Comm-B, as indicated by the interrogator/
CDLP 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
C) forward this data to the Mode S specific services
interface(s) (5.2.3.2.2).
5.2.7.2.2.3 GICB processing. If the received message is
a GICB, as indicated by the interrogatorIGDLP 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 processing. If the received message is
an MSP as indicated by the packet format header (5.2.7.3), the
GDLP shall:
a) generate control data indicating the transfer of an
MSP, the length of the message, the MSP channel
number (MICH) 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
c) forward this data to the Mode S specific services
interface(s) (5.2.3.2.2).
L-bit processing shall be pedormed as specified in 5.2.7.4.
5.2.7.3 MSP PACKET FORMATS
5.2.7.3.1 Short form MSP packet. The format for this
packet shall be as follows:
5.2.7.3.1.1 Data packet type (DP). This field shall be set
to 0.
5.2.7.3.1.2 MSPpacker type (MP). This field shall be set
to 0.
5.2.7.3.1.3 MSP channel number (M/CH). The field shall
be set to the channel number derived from the SSE control
data.
5.2.7.3.1.4 Fillpeld (FILLltO or 6). The fill length shall
be 6 bits for a downlink SLM frame. Otherwise the fill length
shall be 0.
5.2.7.3.1.5 User data (UD). The user data field shall
contain message data received from the Mode S specific
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