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the CIDIN packet level that a restart is occurring.
8.6.6.2.8.3.2 A centre which receives a valid RESTART
REQUEST with a logical channel identifier equal to 0, and
whose logical channels are in the restart state, shall:
a) cancel T20;
8.6.6.2.8 PROCEDUREF OR RESTART
8.6.6.2.8.1 The procedure for RESTART shall be used
to reinitialize a link.
8.6.6.2.8.2 A centre shall initiate the procedure for
restart as follows:
a) transfer a RESTART REQUEST;
b) discard all packets waiting to be transferred or
acknowledged on each logical channel;
c) cause each logical channel to enter the restart state;
d) start a 180-second timer T20; ancl
b) cause each logical channel assigned to carry a PVC to
enter the flow control ready state;
C) cause each logical channel not assigned to carry a
PVC to enter the unassigned state;
d) 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 equalling the
diagnostic code of the RESTART REQUEST;
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
2) if the centre is a PVC termination centre, notify
the CDIN packet level that a restart is occurring.
8.6.6.2.8.3.3 A centre which receives a non-valid
RESTART REQUEST with a logical channel identifier equal
to 0 shall execute the procedure for restart with the appropriate
diagnostic code.
8.6.6.2.8.3.4 A centre which receives a RESTART
REQUEST with a logical channel identifier not equal to 0
shall:
a) if the indicated logical channel is in the flow control
ready state:
1) execute the procedure for reset with the resetting
cause field indicating "local procedure error" and
the diagnostic code indicating "restat packet
received with non-zero logical channel identifier";
if the centre is a PVC transit centre for the PVC
assigned to the logical channel, and the corresponding
logical channel is in the flow control
ready statc, execute the procedure for reset on the
corresponding logical channel with the resetting
cause field indicating "remote procedure crror" and
the diagnostic code indicating "restart packet
received with non-zero logical channel identifier";
b) if the indicated logical channel is in the restart, reset
or unassigned state, discard the RESTART REQUEST.
8.6.6.2.8.4 Receiving RESTART CONFIRMATION
8.6.6.2.8.4.1 A centre which receives a valid RESTART
CONFIRMATION with a logical channel identifier equal to 0,
and whose logical channels are not in the restart state, shall
execute the procedure for restart with the diagnostic code
indicating "packet typc invalid when not in restart state".
8.6.6.2.8.4.2 A centre which receives a valid RESTART
CONFIRMATION with a logical channel identifier cqual to 0,
and whose Iogical channels are in the restart state, shall:
a) cancel T20;
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 equalling the
diagnostic code of the RESTART REQUEST;
2) if the centre is a PVC termination centre, notify
the the CIDIN packet level that all PVCs assigned
to logical channels carried on the data link are
usable.
8.6.6.2.8.4.3 A centre which receives a non-valid
RESTART CONFIRMATION with a logical channel identifier
equal to 0 shall execute the procedure for restart with the
appropriate diagnostic code.
8.6.6.2.8,4.5 A centre which receives a RESTART
CONFZRMATJON with a logical channel identifier not equal
to 0 shall:
a) if the indicated logical channel is in the flow control
ready state:
1) execute the procedure for reset with the resetting
cause field indicating "local procedure error" and
the diagnostic code indicating "restart packet
received with non-zcro logical channel identifier";
2) if the centre is a PVC transit centre for the PVC
assigned to thc logical channel, 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 "remote procedure eiror" and
the diagnostic code indicating "restart packet
received with nun-zero logical channel identifier";
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