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b) if the indicated logical channel is in the restart, reset
or unassigned state, discard the packet.
8.6.6.2.8.5 When T20 expires, the centre shall execute
the procedure for restart with the diagnostic code indicating
"timer expired for restart".
Note.- After unsu~~essfriel tries, recovery decisions
should be taken at higher levels.
b) cause each logical channel assigned to carry a PVC to
enter the flow control rcady state; 8.6.6.2.9 PROCEDURE WHEN LINK LEVEL IS OU'7' OF ORDER
c) cause each logical channcl not assigned to carry a 8.6.6.2.9.1 A centre which detertnines link level is out
PVC to enter the unassigned statc; of ordcr on a particular data link shall:
d) for each PVC assigned to a logical channel carried on a) discard all packets waiting to be transferred on any
the data link: logical channel carried on the data link;
1) if the centre is a PVC transit centre and the b) for each PVC assigned to a logical channel carried on
corresponding logical channel is in thc flaw the data link:
7/11/96
Nn. 71
Annex 10 - Aeronautical Xelecommunications Volume 111
1) if the centre is a PVC transit centre, and the
corresponding logical channel is in the flow
control ready state, execute thc procedure for reset
on the corresponding logical channel with the
resetting cause field indicating "out of order" and
the diagnostic code indicating "no additional
infomation";
2) if the centre is a PVC termination centre, notify
the CIDLN packet level that all PVCs assigned to
logical channels carried on the data link are not
usable.
8.6.6.2.9.2 A centre which determines that the link level
is no longer out of order shall:
a) execute the procedure for restart;
b) for each PVC assigned to a logical channel carried on
the data link:
1) if the centre is a PVC transit centre, and the
corresponding logical channel is in the flow
control ready state, execute the procedure for reset
on the corresponding logical. channel with the
resetting cause field indicating "network
operational" and the diagnostic code indicating "no
additional information";
2) if the centre is a PVC termination centre, notify
the CIDIN packet level that the PVC assigned to
each logical channel carried on the data link is
usable.
8.6.6.2.10 DIAGNOSIICC ODE VALUES
Dia~nostic indication
bit.^ of diagnostic code
8 7 6 5 4 3 2 1
No additional information
Invalid P(S)
Invalid P(R)
Packet type invalid when not
in restart state
Packet type invalid when in
flow control ready state
Packet type invalid on PVCs
Packet too short
Packet too long
Restart packet with non-zcro
logical channel identiher
Timer expired for resct
Tirnct expired for rest&
Note.- Other hit combinations reserved.
8.6.6.2.1 1 RESET~IICVAGU SE FIELD VALUES
8.6.6.2.11.1 When using a packet switched data network
to provide a communication path between CIDJN switching
centres, the resetting cause field in reset packets transferred
from a ClDIN switching centre to the data network shall
always be equal to 0. Resetting cause fields received by a
CIDIN switching centre from such a network shall be handled
in accordance with 8.6.6.2.7.
Bits of resetting cause jielrl
Resetting cause indication 8 7 6 5 4 3 2 1
Centre-originated resct 0 0 0 0 0 0 0 0
Out of order 0 0 0 0 0 0 0 1
Remote procedure error 0 0 0 0 0 0 1 1
Local procedure error 0 0 0 0 0 1 0 1
Network congestion O O O O O l l l
Remote centre operational 0 0 0 0 1 0 0 1
Network operational 0 0 0 0 1 1 1 1
Note.- Other bit combinations reserved.
8.6.6.2.1 2 RESTARTING CAUSE FIELD VALUES
8.6.6.2.12.1 A centre shall always set the restarting
cause field to equal 0.
Note.-- Data networks operating in the packer mode and
connected with CIDIN using procedures described in ITW
CC17T Recornrnendation X.25-1981 may also transfer
restarting cause fields of the following values:
Bits of restarting cause field
Restarting cause indication 8 7 6 5 4 3 2 1
Local procedure error 0 0 0 0 0 0 0 1
Network congestion 0 0 0 0 0 0 1 1
Network operational 0 0 0 0 0 1 1 1
8.6.6.3 THE CIDIN
PACKET PROTOCOL
8.6.6.3.1 THE CIDIN PACKET HEADER FORMAT
8.6.6.3.1.1 The CIDJN packet header shall contain the
following components:
- Packet looping counter and
message priority indicator (PLC and MP)
- Exit address(es) (Ax)
- Destination address(es) (Ad)
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
8.6.6.3.1.2 The CIDIN packcr header shall be generated
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