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network management field (MCFNMF)
- Message type indicator (MT)
- Conversation protect indicator (CP)
- Network acknowledgement indicator (NA)
8.6.6.4.1.4.2 Recommendation.- Where the volume of
trafic requiring acknowledgement so permits, the number of
MINs used should be limited.
- Entry address (Ac) 8.6.6.4.1.4.2.1 At each entry centre or station only one
- End of header @OH) pool of MINs shall be used for infomation and network
management messages.
8.6.6.4.1.2 The transport header shall be generated by
the entry centre or station and shall be interpreted by the exit 8.6.6.4.1.4.3 The second item of the transport header
centre(s) or station(s) receiving the CIDIN packet. shall contain the following two components:
7/11/96
No. 71
Annex 10 - Aeronautical Telecommurtications Volume ZZZ
I) A CIDIN packet sequence number (CPSN), beginning 8.6.6.4.1.4.5 The fourth item of the transport header
in the second octet of this item, shall identify the shall contain the entry address (Ae) which identifies the
sequence number of each CIDIN packet of a message. CIDW entry centre or station that originates the CIDIN
The CPSN shall be assigned in sequence beginning message on the CIDIN. The total number of characters in an
with X0000000. The low order bit of the CPSN shall entry address shall not exceed 8. The Ae values of all binary
be bit 1 of the second octet of this item. ones and all binary zeros shall be reserved. The number of
octets used by the Ae shall be indicated in bits 1-4 of the first
Note.- octet of this item and a length of 0000 shall not be used.
a) IJC the CPSN item consists of two octets including 8.6.6.4.1.4.6 The last item of the transport header shall
the header item then the X (bit 8) in the secon,d be the end of header (EOH) item, as shown in 8.6.6.4.1.3
octet is dze FCP component. above.
b) In the header item a length indication of 0000 is
not used and one octet of information is represented
by a length indication of 0001. 8.6.6.4.2 TRANSPORPTR OCEDURES
2) A final CIDIN packet (FCP) component (bit 8 of the 8.6.6.4.2.1 General. The transport procedures shall be
last octet of this item) which shall be set to: defined for:
1 to indicate the last CIDIN packet of a multipacket a) entry centres and stations;
message, or the only packel of a single-packet
message; b) exit centres and stations.
0 to indicate all other packets.
Relay centres shall not perform processing functions at the
3) The number of octcts used by the CPSN and FCP wansport level.
shall be a maximum of two and shall be indicated in
bits 1-4 of the first octet of this ilem.
8.6.6.4.1.4.4 The third item of the transport header shall 8.6.6.4.2.2 Transport header gerzerution
contain the following four components:
8.6.6.4.2.2.1 For cach information message submitted,
1) A five bit component contained in bits 1 to 5, inter- the entry centre or station shall accept the following
pxeted according to the setting of bit 6 as either: elements:
- a message code and format (MCF) component, a) message content (any approved code and format);
designating which one of the code and format
types specified (see Table 8-7) is employed in the b) exit address(es):
CUDF for CIDIN information messages: or
c) destination addresses applicable to each exit address;
- a network management function (NMP) component,
designating onc of 32 network management d) message priority;
message types and the means for interpreting thc
CUDF (see Table 8-7). e) message codelformat;
2) A message type (MT) component (bit 6) which shall f) requirement for achowledgement;
be set to:
0 to indicate an information message:
1 to indicate a network management message.
g) requirement for unintempted conversation (future
use);
h) requirement for priority intemptable conversation
3) A one bit conversation protect (CP) component (bit 7) (future use).
is reserved for future use.
4) A network acknowledgement (NA) component (bit 8)
Item c) shall be provided for messages in AFTN format.
which shdl be set to: 8.6.6.4.2.2.2 The entry centre or station shall generate
0 to indicate acknowledgement not required; the appropriate transport header based on the information
1 to indicate acknowledgement required. given in e), f), g) and h).
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
Table 8-7. Significance of MCP and NMF indicators
711 1/96
No. 71
MCFLVMF value
b, b4 4 b, b,
0 0 0 0 0 Reserved Reserved
0 0 0 0 1 Network management messages Network management messages
0 0 0 1 0 AFTN Enquiry
0 0 0 1 1 Not yet allocated Acknowledgement
0 0 1 0 0 Enquiry response
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