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this DTE.
5.2.8.2.3 Communications requirements. The mechanism
for communication of changes in subnetwork connectivity
shall be a confirmed service, such as the joinlleave events that
allow notification of the connectivity status.
5.2.8.3 ERROR PROCEDURES
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 p1, and release all resources associated with that channel.
This shall include the cancellation in the transponder of any
frames associated with this SVC. A Mode S CLEAR
REQUEST packet shall be sent to the DCE via the
reformatting process and shall be forwarded by the 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 dl state. The XDLP shall
monitor the activity of all SVCs, not in a READY state @I).
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, d2 or d3 state for more 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 either a failure
to deliver, or a failure to receive, 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 Format. The format of the MB field shall be as
follows:
Bit Content
9 Continuation flag
0 = No continuation
1 = Continues in the next register
2811 1/02
No. 77
Annex 10 - Aeronautical Telecommunications Volume III
10- 15 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 = 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
25 Mode S specific services capability
0 = Not available
1 = Available
26-28 Uplink ELM Average Throughput Capability
0 = No UELM Capability
1 = 16 UELM segments in 1 second
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 6 0 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
Note.- The Mode S transponder may update bits 1-8, 16
and 37-40 independent of the ADLP. Bits 1-8 are provided by
the transponder when the data link capability report is
broadcast as a result of a 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 be 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 integrify. The maximum bit error rates for
data presented at the ADLP/transponder interface or the
GDLP/interrogator interface measured at the local DTE/XDLP
interface (and vice versa) shall not exceed for undetected
errors and lW7 for detected errors.
1 = One 4-segment DELM every second
2 = One 8-segment DELM every second Note.- The maximum error rate includes all errors
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