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(11) code shall be determined from the control data. The MSP
message content shall be extracted from he received message
data. If the message length is 26 bytes or less, the SSE shall
format an air-initiated Comm-B message (5.2.7.1.1.4.2) Ibr
wansfer to the transponder using the short form MSP packet
(5.2.7.3.1). If the message length is 27 to 159 bytes and the
transponder has adequate downlink ELM capability, the SSB
shallformat an ELM message for transfer using the short form
MSP packet. If the message length is 27 to 159 bytes and the
transponder has a limited downlink ELM capability, the SSE
shall format multiple long form MSP packets (5.2.7.3.2) using
ELM messages, as required utilizing the L-bit and MISN fields
for association of the packets. If the message length is 27 to
159 bytes and the wansponder does not havc downlink ELM
capability, he SSE shall format multiple long form MSP
packets (5.2.7.3.2) using air initiated Cornrn-B messages, as
required utilizing the L-bit and M/SN fields for association of
the packets. Different frame types shall never be used in thc
delivery of an MSP message. Message? longer than 159 bytcs
shall be discarded. Thc assignment of downlink MSP channel
numbers shall bc as specified in Table 5-25.
5.2.7.1 ADLP PROCEsSlNG 5.2.7.1.1.4.2 For an MSP, a rcquesl lo send a packet shall
cause the packet to be multisi~c-directed to the interrogator
5.2.7.1.1 DOWNLINPKRO C~SSING which I1 codc is specified in control data. If no I1 code is
specified, the packet shall be downlinked using the air-initiated
5.2.7.1.1.1 Specific services c ~ ~ ~ a b i l iTt yh.c ADLP shall protocol. A message delivery notice for this packet shall he
be capable of receiving control and message data from the provided to the Modc S specific interface whcn thc
2811 1102
No. 77
Anrtex 10 - Aeronautical Telacommunications Volume ZZZ
corresponding close-out(s) have been received from the
trarlsponder. Xf a close-out has not been received from the
transponder in Tz seconds, as specified in Table 5- I, the MSP
packet shall bc discarded. This shall include the cancellation in
the transponder of any frames associated with this packet. A
delivery failure notice for this message shall be provided to the
Mode S specific scrvices interface.
5.2.7.1.2 UPLINK PROCESSING
Note.- This section describes the processing of Mode S
specific services nzessages received from the transpondel:
5.2.7.1.2.1 Specific services capability. The ADLP shall
be capable of receiving Mode S specific serviccs messages
from the transponder via frame processing. The ADLP shall be
capable of delivering the messages and the associated control
data at the specific serviccs interface. When the resources
allocated at this interface are insufficient to accommodate the
output data, the ADLP shall discard the message and deliver
an error report at this interface.
from h e control data and format the broadcast message ror
transkr to the interrogator(s) as specified in 5.2.7.5.
5.2.7.2.1.3 GICB processing. The GDEP shall determine
h e register number and the aircraft address from thc conirol
data. The aircraft address and BDS code 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 Cornm-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 thc
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 15 1 bytes and
lhe transponder does not have uplink ELM capability, the SSE
shall format 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 be discarded.
The interrogator shall provide a delivery notice to the Mode S
Note.- he diugnostic content and the error repofling specific services interface(s) indicating successful or
mechanism are a local issue. unsuccessful delivery, for each uplinked packet.
5.2.7.1.2.2 Broadcast processing. If the received message
is a broadcast Comm-A, as indicated by control data received
over the transponderIADLP interface, the broadcast ID and
user data (5.2.7.5) shall be forwarded to the Mode S specific
services interface (5.2.3.2.1) along with the control data that
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