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8.6.6.2.2.1.7 RESTART CONFIRMATION packet
(Figure 8-9), comprising:
a) the general format identifier;
b) the logical channel identifier, comprising a logical
channel group number and a logical channel number:
c) the packet type identifier,
8.6.6.2.2.2 Each packet shall be completely contained in
the link data field of a frame.
8.6.6.2.2.3 Only one packet shall be contained in the
link data field of a frame.
8.6.6.2.2.4 The octets of each packet shall be transferred
beginning with ockt 1.
8.6.6.2.2.5 The bits of each octet shall be transferred
beginning with bit I.
8.6.6.2.2.6 The first bit transferred of the logical channel
group number, logical channel number, P(R) and P(S) shall be
the arithmetically least significant bit.
8.6-6.2.3 LOGICALC HANNELS
8.6.6.2.3.1 Each data link shall carry up to 4 096 logical
channels.
8.6.6.2.3.2 Each logical channel shall be designated by
a logical channcl identifier, a number between 0 and 4 095,
inclusive, which equals the logical channel group numbcr
multiplied by 2' and added to the logical channel number.
8.6.6.2.3.3 On each data link used to construct a PVC,
a logical channel identifier between 1 and 4 095, inclusive,
shall be assigned solely to that PVC.
8.6.6.2.3.4 The logical channel identifier assigned to a
PVC on each data link shall not be required to be identical to
the logical channel identifiers assigned to the same PVC on
other data links.
8.6.6.2.3.5 On each data link, and when specified by the
procedures described below, a centre shall transfer RESTART
REQUEST and RESTART CONHRMATION before
transferring any other packets.
8.6.6.2.3.6 On each logical channel, and when specified
by the proced~rcs described below, a centre shall transfer
RESET REQUEST and RESET CONmRMATION before
transferring any other packets on that logical channel.
8.6.6.2.3.7 A logical channel shall be in one of the
following states:
a) unassigned, indicating the logical channel has not been
assigned to carry a PVC;
b) restart, indicating that the procedure for restart has
been initiated but not completed;
c) reset, indicating that the procedure for reset has been
initiated but not completed;
d) flow control ready, indicating that the procedure for
data transfcr is being executed.
8.6.6.2.3.8 In the event of a restart, reset, reset or restart
time-out procedure error, outage or restoration of service, the
operator shall be informed, along with the meaning of resetting
or restarting cause fields and diagnostic codes as required.
8.6.6.2.4 RECEIVING UNKNOWN PACKETS AND PACKETS OF
LESS THAN THREE OCTETS IN LENGTH
8.6.6.2.4.1 Unknown packets, packets of less than three
octets in length and over-long packets are non-valid packets.
8.6.6.2.4.2 A centre which receives a packet with a
general format identifier not equal to one of the general format
identifiers specified in 8.6.6.2.2.1 above shall discard the
packet.
8.6.6.2.4.3 A centre which receives a packet of less than
two octets in length shall discard the packet.
8.6.6.2.4.4 A centre which receives a packet of at lcast
two but less than three octets in langth shall:
a) if the logical channel is in the unassigncd, restart or
reset state: discard the packet;
Part I Annex I0 - Aeronautical Telecommunications
b) if the logical channel is in the flow control ready state: b) The receive lower window edge is the oldest P(S)
execute (he proccdure for reset with the resetting cause number associated with the receive (incoming) direcfield
indicating "local procedure crror" and the tion of packets whose corresponding data packet has
diagnostic field indicating "packet type invalid when not yet been acknowledged by a P(R) transferred from
in flow control rcady state"; the receiving centre,
c) if the logicai channel is in the flow control ready state,
and 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 state:
execute the procedure for reset on the corresponding
logical channel with the resetting cause field indicating
"remote procedure crroi' and the diagnostic field
indicating "packet type invalid when in flow control
ready state".
8.6.6.2.4.5 A centre which receives a packet with a
packet type identifier not defined in 8.6.6.2.2.1 above shall:
a) if the logical channel is in the unassigned, restart or
reset state: discard the packet;
b) if the logical channel is in the flow control ready state:
execute the procedure for reset with the resetting cause
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