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5.2.9.2 Format. The format of the MB field shall be as
follows:
10-15 Unassigned
16 Reserved for ACAS
17-23 Mode S Subnetwork Version No.
0 = Mode $ subnetwork not available
1 = Version No. 1
2-127 = Unassigned
Note.- Version No. 1 is defined by this document.
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)
0 = Not available
1 = Available
26-28 Uplink ELM Average Throughput Capability
0 = No UELM Capability
1 = 16 UELM segments in I second
2 = 16 UELM segments in 500 ms
3 = 16 UELM segments in 250 ms
4 = 16 UELM scgrncnts in 125 ms
5 = 16 UELM scgments in 60 ms
6 = 16 UELM segments in 30 ms
7 = Unassigned
29-32 Downlink ELM Average Throughput Capability
0 = No DELM capability
I = 4 DELM scgrnents in 1 second
2 = 8 DELM segments in 1 second
3 = 16 DELM segments in 1 second
4 = 16 DELM segments in 500 ms
5 = 16 DELM segments in 250 ms
6 = 16 DELM segments in 125 ms
7-15 = Unassigned
33 Aircraft Identification Capability (Table 5-24)
0 = No aircraft identification capability
1 = Aircraft identification capability
34-36 Unassigned
37, 38 Reserved for ACAS
39, 40 Unassigned
Bir Content 41 to 56 Bit array indicating the support status of DTE
sub-address 0 to 15
1-8 BDS = lo,, Bit value 0 = DIE not supported
Bit value 1 = DTE supported
9 Continuation flag
0 = No continuation Note.- The Mode S transponder may update bits 1-8, 16,
1 = Continues in the next GICB register 37 and 38 independent of the ADLP Bits 1-8 are provided by
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume 111
the transponder when the data link capabili~ report is
broadcast as a result of a transponder detected change in
capabili~ 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
5.2.10.1 The values for timers shall conform to the
values given in Tables 5-1 and 5-13.
5.2.10.2 Tolerance for all timers shall be plus or minus
one percent.
5.2.10.3 Resolution for all timers shall be one second.
5.2.11 System requirements
5.2.11.1 Data integrity. The maxirnum bit error rates for
data prescntcd at the ADLPItransponder interface or the
GDLPIinterrogator interface measured at the local D W D L P
interface (and vice versa) shall not exceed 10.' for undetected
errors and for detected errors.
Note.- The maximum error rate includes all errors
resulting from data transfers ucross the inte$aces and from
XDLP internal operation.
5.2.1 1.2.1 ADLP timing. ADLP operations shall not take
longer than 0.25 seconds for regular traffic and 0.125 seconds
for interrupt traffic. This interval shall be defined as follows:
a) Transponders with downlink ELM capability. The time
that the final bit of a 128-byte data packet is presented
to the DCE For downlink transfer to the time that the
find bit of the first encapsulating frame is available
for delivery to the transponder.
b) Transponders with Comm-B capability. The time that
the final bit of a user data field of 24 bytes is
presented to the DCE for downlink transfer to the time
that rhc final bit of the last of the Four Comm-B
scgrnenrs that fonns the frame encapsulating the user
data is available for delivery to the transponder.
c) Transponders with zrplink ELM capabili~T he lime
that the final bit of the last segment of an ELM of 14
Comm-C segments that contains a user data field of
128 bytes is received by the ADLP to the time that the
final bit of the corresponding packet is available for
delivery to the DTE.
d) Transponders with Comm-A capability. Thc time that
the final bit of the last segmcnt of four linked Comm-
A segments that contains a user data field of 25 bytes
is reccived by the ADLP to the time that the final bit
of the corresponding packet is available for delivery to
the DTE.
5.2.11.2.2 GDLP timing
Recommendation.- The total time delay across the GDLP.
exclusive of transmission- delay, should not be greater than
0.125 seconds.
5.2.1 1.3 Pe$onnance in a shared environment
Recommendation.- All ofthe requirementsfor data integrity
and timing should take into consideration the efSect of other
active aircraft data links performing transfer operations in
　
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