曝光台 注意防骗
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0 0 1 0 1 ,. Not yet allocated
0 0 1 1 0 I,
0 0 1 1 1
0 1 0 0 0 I, MCF error
0 1 0 0 1 Not yet allocated Not yet allocated
0 1 0 1 0
0 1 0 1 1 I, I,
0 1 1 0 0
0 1 1 0 1
0 1 1 1 0
0 1 1 1 1 Not yet allocated Not yet allocated
I 0 0 0 0
1 0 0 0 1
1 0 0 1 0
1 0 0 1 1 I+
1 0 1 0 0
1 0 1 0 1 Not yet allocated Not yet allocated
1 0 1 1 0
1 0 1 1 I
1 I 0 0 0 ,
1. 1 0 0 1
1 1 0 1 0
1 1 0 1 1 I, !,
1 1 1 0 0
1 1 1 0 I Reserved for regional use
1 1 1 1 0
1 1 1 1 1 8 .
-- -
Reservcd
Meaning
MCF (MT = 0) NMF (MT = 1)
Annex 10 - Aeronautical Telecommun~cations Volume III
8.6.6.4.2.2.3 Message identifcation
number assignmefit
8.6.6.4.2-2.3.1 The entry centre or station shall assign a
MIN value to each message, from a pool of available numbers.
MIN values shall be assigned in continuous numerical
sequence.
8.6.6.4.2.2.3.2 For CIDIN messages which require
network acknowledgement, a given M'(N value shall not be
reassigned to a new message until the corresponding network
acknowledgement has been received by the entry centre or
station.
8.6.6.4.2.2.4 The entry address normally consists of the
first two characters of the location indicator of the concerned
entry centre. In those cases where a station is directly
connected to CXDIN, i.e. performs entrylexit functions, the
entry address shall consist of the first two characters of the
location indicator of the concerned CIDIN station followed by
as many additional characters as necessary to uniquely identify
the station.
8.6.6.4.2-5.1.2 After complete and error free receipt of
the first packet to arrive of any message requiring network
acknowledgement, the exit centre or station shall start a
time-out (TNMA) for that message; the time-out shall be
restarted each time a further CIDIN packet of the same
message is received. The time-out shall be stopped when all
packets of the message have been completely received.
8.6.6.4.2.5.1.3 At the exit centre or station, once a
message with the NA bit set to "1" has been completely
assembled and recorded, a network acknowledgement message
shall be sent back to the entry centre or station.
Note.- The format of the acknowledgement message is
contained in Table 8-8.
8.6.6.4.2.5.1.4 Upon receiving a valid network acknowledgemcnt
response from all addressed exit centres or stations
for the complete message, the entry centre or station shall
remove the corresponding message from retransmission
storage, and shall release the MIN value for future use.
8.6.6.4.2.5.2 Action on detection of
message loss
8.6.6.4.2.3 Information message handling
8.6.6.4.2.3.1 The information message content received
from the applications software shall be placed in one or more
CUDF, with no addition or modification (see Figure 8-2). This
shall be the responsibility of the entry cenlre or station.
8.6.6.4.2.4 Network management message handling
8.6.6.4.2.4.1 The enlry centre or station shall generate
and respond to network management messages using the
standard format. Network management CUDF contents are
generated by the entry centre or station.
Note.- The format of the network management messages
is contained in Table 8-8.
8.6.6.4.2.5 Recovery for
messages cm ClDIN
8.6.6.4.2.5.1 Handling of messages requiring
acknowledgement on the transport level
8.6.6.4.2.5.1.1 For messages requiring network acknowledgement
the entry centre or station shall, before initiating
transmission, set thc NA bit to "1" and temporarily store the
message for possible retransmission. After sending the last
frame of the message a response time-out (TMR), based on the
transit time to the most remote cxit centre or station, shall be
initiated.
8.6.6.4.2.5.2.1 If an entry centre or station does not
receivc a network acknowledgement message for a message
sent with the NA bit set to "I", within a period of time (TMR)
it shall retransmit the message with the same MIN value.
8.6.6.4.2.5.2.2 If a network acknowledgement message
is still not obtained, the entry centre or station shall send an
enquiry message to that exit centre or station, initiate a
message response time out (TEM) and shall stop transmissions
of infbrmation messages to that exit centre or station.
8,664.2.5.2.3 When an entry centre or station fails to
obtain an acknowledgement even after a retry to the exit
centre or station, it shall inform the application level of the
unsuccessful attempt to communicate. No information
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