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series ol' consecutive sequence numbers.
HSNR The highest value of SNR in the resequencing
window.
Note.- A limit on the number of unacknowledged packets
is required since the SNfteld is six bits long and therefore has
a maximum of 64 different values hefore the values repeat.
5.2.6.9.5.1 Resequencing. The resequencing algorithm
shall maintain the variables HSNR and NESN for each SVC.
NESN shall be initialized to 0 for all SVCs and shall be reset
lo 0 when the SVC re-enters the channel number pool
(5.2.5.1.2).
5.2.6.9.5.2 Processing of' packets within the duplication
window. If a packet is received with a sequcncc number value
within the duplication window, the packet shall be discarded.
5.2.6.9.5.3 Processing of packets within the reseqziencing
window. If a packet is received with a sequence number
within the resequencing window, it shall be discarded as a
duplicate if a packet with the same sequence number has
already been received and stored in the rescqucncing window.
Otherwise, the packet shall be stored in the rcsequencing
window. Then, if no Tq timers are running, HSNR shall be set
to the value of SNR for this packet and a Tq timcr shall be
slarted with its initial value (Tables 5-1 and 5-13). If at leas1
one Tq timer is running, and SNR is not in the window
between NESN and HSNR + I inclusive, a new Tq timcr shall
be slarlcd and the value of HSNR shall be updated. If at least
28/11/02
No. 77
Part 1 Annex 10 - Aexonuutical Telecommunications
one Tq timer is running, and SNR for this packet is equal to
HSNR + 1, the value of HSNR shall be updated.
5.2.6.9.5.4 Release of packers to tlie XDCE. If a packet is
received with a sequence number equal to NESN, the following
procedure shall be applied:
a) the ~acket and any packets already stored in the
resequencing window up to he next missing sequencc
number shall be passed to the XDCE;
b) NESN shall be set to 1 + the value of the sequence
number of the last packet passed to the XDCE; and
C) lhe 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 thc packet
associated with the Tq timer that has expired;
b) any stored packets with sequence numbcrs 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
c) the Tq timer associated with any released packets shall
be stopped.
5.2.7 Mode S specific services processing
The data formats and protocols for messages transferred via
Mode S specific services shall be as specified in the Appendix
to this chapter. Mode S specific services shall bc processed by
an entity in the XDEP termed the Mode S speciiic services
entity (SSE).
Note 1.- Tllis section describes the processing of control
and nzessage data received fronz the Mode S specific services
intet$ace.
Note 2.- Control data consists of irifornzation permitting
the dettrmiizatiorl oJ for example, message length, BDS code
used to access the data fornzur for a particular register; and
aircrnft address.
Mode S specific services interfacs(s) and sending delively
notices to this interface. The control data shall be processed to
determine the protocol type and the length of thc message
data. When the message or control data provided a1 this
interface arc erroneous (i.e. incomplete, invalid or
inconsistent), the ADLP shall discard the message and deliver
an error reporl at the interface.
Note.- Tlze diagnostic content and error reporting mechanism
are a local issue.
5.2.7.1.1.2 Broadcast processirzg. The control and message
data shall be used to format the Comm-B broadcast message as
specified in 5.2.7.5 and transfened to the transponder.
5.2.7.1.1.3 GICB processing. The 8-bit BDS code shall bc
determined from the control data. The 7-byte 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
registers shall be as specified in Table 5-24.
5.2.7.1.1.4 MSP processing
5.2.7.1.1.4.1 The MSP message length, channel number
(M/CH) (5.2.7.3.1.3) and optionally the interrogator identifier
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