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message data. The register content shall be transferred to the
transponder, along with an indication of the specified register
number. A request to address one of the air-initiated Comm-B
registers or the airborne collision avoidance system (ACAS)
active resolution advisories register shall be discarded. The
assignment of GICB register numbers shall be as specified in
Table 5-24.
5.2.7.1.1.4 MSP processing
5.2.7.1.1.4.1 Thc MSP message length, channel number
(M/CH) (5.2.7.3.1.3) and optionally the interrogator identifier
(11) code shall be determined from the control data. The MSP
message content shall be extracted from the received message
data. If the message length is 26 bytes or less, the SSE shall
format an air-initiated or multisite-directed Comm-B message
(5.2.7.1.1.4.2) for transfer 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 SSE shall format an ELM message for rransfer
to the transponder using the short form MSP packet. If the
message length is 27 to 159 bytes and the transponder does
not have adequate downlink ELM capability, the SSE shall
format multiple long form MSP packets (5.2.7.3.2) as required
utilizing the L-bit and the MISN fields for association of the
packets. Messages longer than 159 bytes shall be discarded.
The assignment of downlink MSP channel numbers shall be as
specified in Table 5-25.
5.2.7.1.1.4.2 For an MSP, a request to send a packet
shall cause the packet to be multisite-directed to the interrogator
which I1 code is specified in control data. If no LT code
is specified, the packet shall be downlinked using the airinitiated
protocol. A message delivery notice for this packet
shall be provided to the Mode S specific interface when the
corresponding close-out(s) have been received from the transponder.
If a close-out has not been received from the
transponder in Tz seconds, as specified in Table 5-1, the MSP
packet shall be 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 $ specific services interface.
5.2.7.1.2 UPLINKPR OCESSING
Note.- .This section describes the processing of Mode S
specific services messages received from the transponder:
5.2.7.1.2.1 Specific services capability. The ADLP shall
be capable of receiving Mode S specific services messages
from the transponder via frame processing. The ADLP shall be
capable of delivering the messages and the associated control
data at thc specific services interface. When the resources
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241 No. 71
Annex 10 - Aeronautical Telecommunications Volume 111
allocated at this interface are insufficient to accommodate the
output data, the ADLP shall discard the message and deliver
an error repon at this interface.
Note.- The diagnostic content and the error reporting
mechanism are a local issue.
5.2.7.1.2.2 Broadcast processing. If the received message
is a broadcast Comnl-A, as indicated by control data
receivcd over the transponder1ADLP interface, the 7-byte MA
field of the broadcast Comm-A (5.2.7.5) shall be forwarded to
the Mode S specific services interface (5.2.3.2.l), along with
the contents of the first 32 bits of the interrogation that
delivered the broadcast message, and control data that 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. I 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 (MJCH), the IIS
subfield (5.2.2.1.1.1) and (for a single segment SLM) the first
32 bits of the interrogation that delivered the MSP together
with control data that identifies this as an MSP message. L-bit
processing shall be performed as specificd in 5.2.7.4. The
assignment of uplink MSP channel numbers shall be as
specified in Table 5-23.
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 format multiple long form MSP
packets (5.2.7.3.2) utilizing the L-bit and the MISN fields for
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