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number of the last packet passed to the XDCE; and
c) the Tq timer associated with any of the released
packets shall be stopped.
5.2.6.9.6 Tq timer expiration. If a Tq timer expires, the
following procedure shall be applied:
a) NESN shall be incremented until the next missing
sequence number is detected after that of the packet
associated with the Tq timer that has expired;
b) any stored packets with sequence numbers that are no
longer in the resequencing window shall be forwarded
to the XDCE except that an incomplete S-bit sequence
shall be discarded; and
Note.- The downlink broadcast identijer is equivalent to
the Comm-B data selector (BDS) value (3.1.2.6.11.2.1 of
Annex IO, VoLume ZV).
5.2.7.1 .I .3 GICB processing. The $-bit GICB register
number shall be determined from the control data. The 7-byte
GICB register content shall be extracted from the received
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
c) the Tq timer associated with any released packets shall 5.2.7.1.1.4.1 The MSP message length, channel number
be stopped. (M/CH) (5.2.7.3.1.3) and optionally the interrogator identifier
5/11/98
No. 73
Annex 10 - Aeronautical Telecommunicutions Volume ZIZ
(IT) codc 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 transfer
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 requircd
utilizing the E-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 11 code is specified in control dava. If no II code is
specified, the packet shall be downlinked using the air-initiated
protocol. A message delivery notice for this packet shall be
provided to the Mode S specific inte~ace 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 S
specific services interface.
5.2.7.1.2 UPLINKP ROCESSING
Note.- This section describes the processing of Mode S
specific services messages received from the transponder:
5.2.7.1.2.1 Spec$c 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 the specific services interface. When the resources
allocated at this interface are insufficient to accommodate the
output data, thc ADLP shall discard the message and deliver
an error report at this interface.
Note.- The diagnostic content nnd the error reporting
mechanism are a Local issue.
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 transponder/ADLP 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 (5.2.3.2.1 ), 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 Fable 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),
　
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