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shall be a confirmed service.
5.2.8.3 ERRORPR OCEDURES
5.2.8.3.1 Link failure. The failure to deliver a packet to
the referenced XDLP after an attempt has been made to
deliver this packet via all available interrogators shall be
declared to be a link level failure. For an SVC, the XDCE
shall enter the state pl, and release all resources associated
with that channel. This shall include he cancellation in the
transponder of any frames associated with this SVC. A
Mode S CLEAR REQUEST packet shall be sent 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 dl state. The XDLP shall
monitor the activity of all SVCs, not in a READY state (pl).
If an SVC is in the (XDCE) FLOW CONTROL READY state
(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 states. If an XDCE SVC
is in the p2, p3, p6, p7, 62 or d3 state for more than Tx
seconds, the link failure procedure of 5.2.8.3.1 shall be
performed.
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 Format. The format of the MB field shall be as
follows:
5/11/98
Nu. 73
A~nex10 - Aeronautical Teleconzmunications Volume ZIZ
Bit C~ntent
1-8 BDS = 10,,
9 Continuation -flag
0 = No continuation
1 = Continues in the next GXCB register
10-1 5 Unassigned
16 Reserved for ACAS
17-23 Mode S Subnetwork Version No.
0 = Mode S subnetwork not available
1 = Version No. 1 (1996)
2 = Version No. 2 (1998)
3-127 = Unassigned
24 Transponder level (2.1.5 of Annex 10,
Volume IV)
0 = Level 2-4
1 = Level 5
25 Mode S specific services capability report
(Table 5-24)
O = Not available
35 Surveillance identifier capability
36 Common usage GICB capability report
37-40 ~esemedfo r ACAS
41 to 56 Bit array indicating the support status of DTE
sub-address 0 to 15
Bit value 0 = DTE not sapported
Bit value 1 = DTE supported
Note.-- The Mode S transponder may update bits 1-8, 16
and 37-40 independent of the A D U Bits I-8 are provided by
the transponder when the data link capability report is
broadcast as a result of n transponder-detected change in
capability reported by the ADLP (3.1.2 of Annex 10,
Volume IV).
5.2.9.3 Protocol. In all cases, the first bit shall bc the
high order bit and shall be the first bit transmitted. ADLP
frame processing shall generate the data link-capability report
at least once per second and transfer it to the transponder at
least once every second.
5.2.10 System timers
1 = Available 5.2.10.1 The values for timers shall co~lform to the
values given in Tables 5-1 and 5-13.
36-28 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 rns
4 = 16 UELM segments in 125 rns
5 = 16 UELM segments in 60 ms
6 = 16 UELM segments in 30 ms
7 = Unassigned
29-32 Downlink ELM: Throughput Capability of
downlink ELM containing the maximum
number of ELM segments that the transponder
can deliver in response to a single requesting
interrogation (UF = 24).
0 = No DELM capability
1 = One 4-segment DELU every second
2 = One 8-segment DELV every second
3 = One 16-segment DELM every second
4 = One 16-segment DELM every 500 ms
5 = One 16-segment DELM every 250 ms
6 = One 16-segment DELM every 125 ms
7-15 = Unassigned
3 3 Aircraft Identification Capability (Table 5-24)
0 = No aircraft identification capability
1 = Aircraft identification capability
14 Squitter capability subfield
5.2.10.3 Resolution for all timers shall be one second.
5.2.11 System requirements
5.2.1 1.1 Data integrity. The maximum bit error rates for
data presented at the ADLPItransponder interface or the
GDLP/intemgator interface measured at the local DTElXDLP
　
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