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by the entry cer.tre or station and shall be interpreted by relay
centre(s) and exit ccntre(s) or station(s) receiving the CIDIN
packets.
First bit transmiited
(low order bit) .L
I
PACKET LOOPING
COUNTER
AND MESSAGE
PRIORITY ITEM
LENGTH
NUMBER OF
etc.
0010
EXIT ADDRESS
ITEM
NUMBER OF
Ads
DESTINATION
ADDRESS
ITEM
Ad,
Ad2
Ad,
Ad,,
DESTINATION
ADDRESS
ITEM
Priority I (highest)
Priority 2
Priority 3
Priooity 4
Priority 5
Priority 6
Priority 7
Pnority 8
The five bit packet looping counter (PLC) shall be set to 31
by the entry centre or station.
8.6.6.3.1.3.1.1 The highest CIDIN priority shall be
reserved for CIDIN network management messages. The
remaining priorities shall be available for user messages.
8.6.6.3.1.3.2 The following item of the CIDIN packet
header shall contain the exit address(es). The exit address
normally consists of the first two characters of the location
indicator of thc concerned exit centre. In those cascs where a
user is directly connected to CIDIN, the exit address shall
consist of the first two characters of the location indicator of
the concerned CIDIN station followed by as many additional
characters as necessary to uniqucly identify the user. Thc total
number of characters in an exit address shall not exceed 8.
The Ax values of all binary ones and all binary zeros shall be
resewed. The number of octets used by each Ax shall be
indicated in bits 1-4 of the first octet of each exit address item.
There shall be an exit address item for each Ax to which the
Only in the first CJDIN packet is to be transmitted. The maximum number of
packet of exit addresses in a CIDIN message shall be 16.
messages in
AFTN format 8.6.6.3.1.3.3 If destination addresses (Ads) are used they
shall be inserted in the first packer and shall be inserted
irnmcdiately following each associated exit addrcss (sec
8.6.6.3.1.2 above).
8.6.6.3.1.3.4 The number of destination addresses associated
with an exit centre address shall be indicated in bits 1-4
of each destination address item. The length of each destination
address shall be 8 octets.
8.6.6.3.1.3.5 When thc number of destination addresses
associated with an exit ccntre address exceeds 15 an additional
destination address itcm shall be added following the item
containing the first 15 destination addresses.
Last bit transmitted
8.6.6.3.2 CIDINPACKETPROCEDURES
Nore.- Axs and Acls are specified as IA-5 in 8.6.2.5.
8.6.6.3.2.1 General. The CIDIN packet procedures shall
8.6.6.3.1.3 Thc components contained in the octets of be defined for:
the CIDIN packet header shall bc the following.
a) entry centres and stations;
8.6.6.3.1 -3.1 The first item shall contain a five bit packet
looping counter (PLC, bits 8, 7, 6, 5 and 4) and a three bit b) relay ccntres;
message priority indicator (MP, bits 3, 2 and I) which shall be
interprcted as follows: C) exit centres and stations.
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume ZZZ
8.6.6.3.2.2 CIDIN packet header generation 8.6.6.3.2.5.2.1 The relay of CIDIN packets shall not
wait for complete CIDIN message receipt.
8.6.6.3.2.2.1 For each information message submitted,
the CIDXN packet level shall accept the following elements 8.6.6.3.2.5.3 Packets having the same priority shall be
from the transport level: lransmitted in the order in which they are received.
a) message content, segmented such that the maximum
packet length would not be exceeded if the routing 8.6.6.3.2.6 Action on packets with errors
analysis were to require output on a single CLDW
circuit; 8.6.6.3.2.6.1 When a centre or station receives a packet
that does not conlain a valid packet header, it shall discard that
b) exit address(es); packet.
c) CIDIN message priority;
8.6.6.3.2.7 Loss of communication
d) destination address(es), for inclusion in the first packet
of messages in AFTN format only.
8.6.6.3.2.2.2 The enlry centre or station shall generate
the packet header based on the information given in b), c) and
d), and based on the information derived in the routing
analysis process.
8.6.6.3.2.3 Routing and relay of
CJDIN packets
8.6.6.3.2.3.1 All packcts shall be sent by the predetermined
route available to effect delivery to the exit centre(s) or
station(s). Where the routing requires that a CIDIN packet be
sent to the relaytentry centre or station from which it was
received, the next most expeditious route shall be used.
　
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