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This shall include the cancellation in the lransponcler of any
frames associated with this SVC. A Mode S CLEAR
REQUEST packet shall be sent to thc DCE via the
reformatting proccss and shall be forwarded by h e DCE as an
IS0 8208 packet to the local DTE as described in 5.2.6.3.3. On
the aircraft side, the channel shall not be returned to the ADCE
channel pool, i.e. does not return to the state pl, until Tr
seconds after the link failure has been declared (Table 5-1).
5.2.8.3.2 ACTIVE CHANNEL DETERMINATION
5.2.8.3.2.1 Procedure for d l state. The XDLP shall
monitor the activity of all SVCs, not in a READY state 011).
If an SVC is in the (XDCE) FLOW CONTROL READY stale
(dl) for more than Tx seconds (the active channel timer,
Tables 5-1 and 5-13) without sending a Mode S RR, RNR,
DATA, or REJECT packet, then:
a) if the last packet sent was a Mode S REJECT packet to
which a response has not been received, then the XDLP
shall resend that packet;
b) otherwise, the XDLP shall send a Mode S RR or RNR
packet as appropriate to the peer XDLP.
5.2.8.3.2.2 Procedure for other stutes. If an XDCE SVC
is in the p2, p3, p6, p7, d2 or d3 state for morc than Tx
seconds, the link failure procedure of 5.2.8.3.1 shall be
performed.
5.2.8.3.2.3 Link failure shall be declared if cithcr a failure
to deliver, or a failure to receivc, keep-alive packets has
occurred. In which case the channel shall be cleared.
5.2.9 The data link capability
report format
5.2.9.1 This report shall be transferred using the groundinitiated
Comm-B protocol, as specified in 3.1.2.6.10.2 of
Annex 10, Volume IV.
5.2.9.2 firnlut. The format of the ME ficld shall be as
follows:
9 Continualion flag
0 = No continuation
1 = Con~inuesin the next register
28/11/02
No. 77
Annex 10 - Aeronautical Telecommunications Volume ZZZ
10- 15 Unassigned
16 Reserved for ACAS
17-23 Mode S Subnetwork Version No.
0 = Mode S subnetwork not available
= Version No. 1 (1996)
2 = Version No. 2 (1998)
3 = Version No. 3 (2002)
4-127 = Unassigned
24 Transponder level (2.1.5 of Annex 10, Volume IV)
0 = Level 2-4
1 = Level 5
Note.- The Mode S transponder may update bits 1-8, I6
and 37-40 independent ofthe ADLR Bits 1-8 are provided by
the tramponder when the data link cupability report is
broadcust as a result of a transponder-detected change
in capability reported hy the ADLP (3.1.2 of Annex 10,
Volume IV).
5.2.9.3 Protocol. In all cases, the first bit shall be the high
order bit and shall be the first bit transmitted, ADLP frame
processing shall gencrate the data link capability report at lcast
once per second and transfer it to the transponder at lcast once
every second.
25 Mode S specific services capability 5.2.10 System timers
0 = Not available
1 = Available 5.2.10.1 The values for timers shall conform to the values
given in Tables 5-1 and 5-13.
26-28 Uplink ELM Average Throughput Capability
0 = No UELM Capability 5.2.10.2 Tolerance for all timers shall be plus or minus
1 = 16 UELM segments in 1 second one percent.
2 = 16 UELM segments in 500 ms
3 = 16 UELM segments in 250 ms
4 = 16 UELM segments in 125 ms
5 = 16 UELM segments in 60 ms
6 = 16 UELM segments in 30 ms
7 = Unassigned
5.2.10.3 Resolution for all timers shall be one second.
5.2.11 System requirements
29-32 Downlink ELM: Throughput Capability of 5.2.11.1 Data integriv. The maximum bit error rates for
downlink ELM containing the maximum data presented at the ADLPItransponder interface or the
number of ELM segments that the transponder GDLPIinterrogator interface measured at the local DTFLXDLP
can deliver in response to a single requesting interface (and vice versa) shall not exceed for undetected
interrogation (UF = 24). errors and for detected errors.
0 = No DELM capability
I = One 4-segment DE~Mev ery second
2 = One 8-segment DELM every second Note.-- The maximum error rate includes all errors
3 = One 16-segment DELM every second resulting fmm data transfers acmss the interfaces and fmm
4 = One 16-segment DELM every 500 ms XDLP internal operation.
5 = One 16-segment DELM every 250 ms
6 = One 16-segment DELM every 125 ms
7-1 5 = Unassigned
33 Aircraft Identification Capability (Table 5-24) 5.2.1 1.2.1 ADLP timing. ADLP operations shall not take
0 = No aircraft identification capability longer than 0.25 seconds for regular traffic and 0.125 seconds
1 = Aircraft identification capability for interrupt traffic. This interval shall be defined as follows:
34 Squitter capability subfield
35 Surveillance identifier capability
　
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