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8.6.6.3.2.3.2 Centres shall be interconnected by one or
more PVCs. The route shall be defined as that which requires
the least number of PVC traversals to reach the exit centre.
8.6.6.3.2.3.2.1 It shall be permissible to choose between
two or more equally expeditious predetermined routes by any
suitable method.
8.6.6.3.2.4 Selection of PVC for transmission
of a CIDIN packet
8.6.6.3.2.4.1 Each CIDIN switching centre shall
maintain a routing table relating exit addresses with primary
and, if applicable, secondary outgoing PVCs.
8.6.6.3.2.5 Transmission of CIDIN packets
8.6.6.3.2.7.1 When a relay centre is notified that a PVC
is not usable it shall:
a) discard all packets addressed to exit centres for which
both primary and secondary outgoing PVCs are not
usable;
b) transmit all packets addressed to exit centres for which
the primary outgoing PVC is not usable along the
secondq outgoing PVC to the exit centres;
c) discard all packets which the routing requires to be
sent to the relaytentry centre from which they were
received (see 8.6.6.3.2.3.1);
d) for multi-addressed packets, transmit the packets to
those addresses for which communication is possible;
and
e) inform the operator of the action taken.
8.6.6.3.2.7.2 If a CTDIN switching centre ceases operation
because of an equipment failure, it shall, when it resumes
operations, discard all packets which are neither originated by,
nor addressed to it. The action on packets addressed to or
originated by the failed centre will be left for national
determination.
8.6.6.3.2.8 Handling of multiple
dissemination
8.6.6.3.2.8.1 A centre which receives a CIDIN packet
for multiple dissemination shall determine the outgoing PVC
on which the CIDIN packets of the CIDIN message shall be
transmitted for cach Ax.
8.6.6.3.2.5.1 Higher priority packets shall be transmitted 8.6.6.3.2.8.2 The CIDIN packet header of packets
before lower priority packets. kansmitted on each outgoing PVC shall contain only the exit
centre addresses and destination addresses (first packet of
8.6.6.3.2.5.2 The relay of CIDW packets shall not be messages in AFTN format only) to be reached via the partidelayed
unnecessarily. cular PVC. The relay of CIDW packets shall not result in
7/11/96
No. 71
Part I Annex 10 - Aeronnutical Telecotnmunications
unnecessary multiplication of packets. Exit centre addresses 8.6.6.4.1.3 The transport header shall consist of:
and destination addresses (messages in AFTN format only) not
to be reached via the particular PVC shall be stripped. This First bit transmitted
process shall be called address stripping. (low order bit) 1
Note.- Guidance material on address stripping is
contained in Volume II, Attachment C.
8.6.6.3.2.8.3 Relay centres shall not alter the received
CIDIN packet headers of CIDIN packets that are transmitted
on a single outgoing PVC for all Axs specified.
8.6.6.3.2.8.4 Relay centres shall compose new CIDIN
packet headers for CDIN packets that are transmitted on more
than one outgoing PVC and apply address stripping.
8.6.6.3.2.8.5 Centres detecting address(es) for which
they are responsible among the Axs shall act as exit centre for
those address(es), and as relay centre for the other Axs.
8.6.6.3.2.9 Action to be taker1 with
packet looping counter
LENGTH
LENGTH
8.6.6.3.2.9.1 When a relay centre receives a packet with
a PLC value of greater than zero it shall decrement the PLC
by 1 and transmit the packet. If, on receipt, the value of the
PLC is zero the packet shall be discarded. t
Last bit transmitted
8.6.6.4 THE TRANSPORT
PROTOCOL
8.6.6.4.1 THE TRANSPORT HEADER FORMAT
MIN ITEM
CPSN ITEM
MESSAGE
CHARACTERISTICS
ITEM
ENTRY ADDRESS
ITEM
END OF HEADER
ITEM
86641.4 The components contained within the
transport header shall be as follows:
8.6.6.4.1.1 The transport header shall contain the 8.6.6.4.1.4.1 The first item of the transport header shall
following components: contain the message identification number (MIN) expressed in
binary form. The low order bit of the MIN shall be bit 1 in the
- Message identification number (Mm) second octet of the item. Any number of octets between one
and fifteen shall be employed to provide the MIN. The number
- CIDIN packet sequence number (CPSN) of octets used by the MIN shall be indicated in bits 1-4 of the
- Final CIDIN packet indicator (FCP) first octet of this item. The MIN shall identify the number of
- Message code and format or a CIDIN message transmitted by a specific entry centre or
station.
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