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identifies this as a broadcast message. The assignment of
uplink broadcast identifier numbers shall be as specified in
Table 5-23.
5.2.7.1.2.3 MSP processing. If the received message is
an MSP, as indicated by the packet format header (5.2.7.3),
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 (M/CH), the IIS
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 PROCESSING
5.2.7.2.1 UPLINKPR OCESSING
5.2.7.2.2 DOWNL~NPKRO CESSING
5.2.7.2.2.1 Speccjic services capability. The GDLP shall
be capable of receiving Mode S specific services messages
from the interrogalor via frame processing.
5.2.7.2.2.2 Broadcast processing. If the received message
is a broadcast Comm-B, as indicated by the interrogatorIGDLP
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
GXCB, as indicated by the interrogator1GDLP interface, the
GDLP shall:
5.2.7.2.1.1 Speci3c services cupuhilit)~. The GDLP shall
be capable of receiving control and message data from the a) generate control data indicating the presence of a GICB
Mode S specific services interface(s) (5.2.3.2.2) and sending message, the register number and the 24-bit address of
delivery notices to the interface(s). Thc control data shall be thc aircraft from which the mcssagc was received;
processed to determine the protocol lype and the length of the
message data. b) append the 7-byte MB field of the GICB; and
5.2.7.2.1.2 Broudcasr processing. The GDLP shall deter- c) forward this data to the Mode S specific services
mine the in~crrogaror(s), broadcast azimuths and scan timcs inlerface(s) (5.2.3.2.2).
2811 1/02
No. 77
Part 1 Annex 117 - Aeror~autical Telecon~~zur~ications
5,2.7.2.?,4 MSP processing. If the received message is an
MSP as indicared by the packet format header (5.2.7.31, the
GDLP shall:
a) generate control data indicating the lransfer 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 rcceived;
b) append h e user data field of the received MSP packer;
and
c) forward this data to the Mode S specific services
intcrface(s) (5.2.3.2.2).
L-bit processing shall be performed as specificd in 5.2.7.4
5.2.7.3.3.1 MSP packet type (MP). This tield shall be set
to I .
5.2.7.3.3.2 S~cpervisofpya cket (SP).T his lield shall be set
10 0.
5.2.7.3.3.3 Lfield (L). A value of 1 shall indicate that the
packel is part of an L-bit scqucnce with more packets in the
sequence to follow. A value of 0 shall indicate that the
sequence ends with this packet.
5.2.7.3.3.4 MSP sequence numberfield (M/SN). This ficld
shall be used to detect duplication in the delivery of L-bit
sequences. The first packet in an L-bit sequence shall be
assigned a sequence number of 0. Subsequent packets shall be
numbered sequentially. A packet received with the same
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 M Sp~ack et, ~h~ format for performed as specified for M-bit processing (5.2.5.1.4.1)
packet shall be as follows: cxccpt as specified in the following paragraphs.
5.2.7.3.1.1 Dutu pucket type (DP).T his field shall be set a) verifying that the packet order is correct using the MISN
to 0. field (5.2.7.3.2);
5.2.7.4.1 Upon receipt of a long form MSP packet, thc
5.2.7.3.1.2 MSP packet zype (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
within the frame;
DP:1
5.2.7.3.1.3 MSP channel number (M/CH). The field shall
be set to the channcl number derived from the SSE control c) associating each user data field in an MSP packet
received with a previous user data field in an MSP
data.
packet that has an L-bit value of 1; and
5.2.7.3.1.4 Fill field (FILLI:O or 6). The fill length shall
be 6 bits for a downlink SLM frame. Otherwise the fill length
　
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