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messages shall be sent to that exit centre or station until one
of the ENQ messages periodically sent to that exit centre or
station is acknowledged by that centre CU station.
8.6.6.4.2.5.2.4 When a multiply disseminated message
is not acknowledged by all the cxit centres or stations
addressed, the entry ccntre or station, on expiry of time out
(TMR) shall retransmit the message only to those exit centres
or stations which did not acknowledge the message. In tbis
instance the exit centres or stations shall retain packets of a
message for a period of time (TNMA) and discard these
packets if the message is not completed. This time 'PTVMA
shall be shorter than ox equal to TMR.
Note.- The fonnat of the enquiry message is contained in
Table 8-8.
Annex 10 - Aeronautical Telecommunications
Table 8-8. Format for network management messages
7/11/96
No. 71
NETWORK MANAGEMENT
a) Use rhe Ae of the original information message. e) Use the MIN of original information message.
b) Use the Ax of the original information message. f) Use the Ax of original information message.
c) Use the Ae of the original information message. g) Use the CPSN of the last packet of the received CIDIN message.
d) Use the Ax identifier of own centre or station. Bit 8 shall be set to 0.
ACK
C
0
M
M
U
N
I
C
A
T
I
0
N
S
C
0
N
T
R
0
L
F
I
E
L
D
ENQ
ClDlN USER DATA FIELD
NOTES:
MESSAGE
ClDIN
PACKET
HEADER
T
R
A
N
S
P
0
R
T
H
E
A
D
E
R
Enquiry response MCF error
MP
Ax
MIN
CPSN
FCP
MCF/NMF
MT
CP
N A
Ae
EOH
000
Note a) Note b)
next available
all zero
1
see Table 8-7
1
0
0
Note c)
Note b)
Note a)
Note a)
loo0 0000
Note d) Note b)
0100 1 LENGTH
Note e)
0001 LENGTH NONE NONE
Note f)
0100 I LENGTH
Note e)
0101
OOO1
LENGTH
LENGTH
Note g)
Note f)
0101 LENGTH
Note g)
Annex 10 - Aeronautical Telecommunications Volume ZZZ
8.6.6.4.2.5.2.5 On receipt of an enquiry message, the exit
ccntre or station shall acknowledge the enquiry message by
transmitting an enquiry response message back to the entry
centre or station.
Note.- The format of the enquiry response message is
contained in Table 8-8.
8.6.6.4.2.5.2.6 Once the entry centre or station has
received the enquiry response message, it shall resume sending
information messages to that exit centre or station.
8.6.6.4.2.5.2.7 When a response to an enquily message
is not received within a period of time (TEM), the entry centre
or station shall retransmit the enquiry message.
8.6.6.4.2.5.2.8 When the exit centre or station time out
period expires before all packets of the message have been
completely received, the exit centre or station shall discard the
incomplete message.
8.6.6.4.2.6 Handling of messages not
requiring acknowledgement on
the transport level
8.6.6.4.2.6.1 After complete and error-free receipt of the
first packet to arrive of any message not 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 CIDN packet of the same message is
received. The time out shall be stopped when all packets of
the message have been completely received.
8.6.6.4.2.6.2 When the exit centre or station time out
period expires before all packets of the message have been
completely received, the exit ccntre or station shall discard the
incomplete message.
8.6.6.4.2.7 Handling of messages with
unacceptable code~onnatc ombinations
8.6.6.4.2.7.1 When an exit centre or station receives a
message, requiring or not requiring an acknowledgement,
which is in a code and format for which it has no applications
software, it shall discard the message, and send an MCF error
message to the entry centre or slation.
Note.- The~fomaot f the MCF error message L contained
in Table 8-8.
8.6.6.4.2.7.2 On receipt of an MCF error message, the
entry centre or station shall notify the application level.
8.6.6.4.2.8 Handling of multiple
dissemination messuges
8.6.6.4.2.8.1 For messages requiring multiple dissernination,
the recovery procedures shall take place between the
entry centre or station and all exit centres or stations
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