When a message exceeds five textual pages, the
message must be divided into transmission sections.
The message should be separated at a convenient point
on the last permissible page of a transmission section.
This normally will be at the end of a sentence or
cryptopart. Each section must be numbered in plain
language at the beginning of the text following the
classification or abbreviation “UNCLAS.” For
example:
UNCLAS SECTION 1 OF 2
In long encrypted messages, when a transmission
section starts with a new cryptopart, the designation of
the cryptopart follows the designation of the
transmission section. Also, when a numerical group
count is associated with an off-line encrypted message
and is indicated in format line 10, the count must
indicate the number of groups in the textual section
being transmitted— not the number in the complete
message. Cryptopart identification is included in the
group count; the page identification and transmission
section are not.
Statistical and meteorological messages can have
up to 100 lines of text without paging when the
inclusion of paging information would disrupt
processing by the user. However, you should divide
these types of messages into transmission sections if
they exceed 100 lines of text.
Misrouted and Missent Messages
A misrouted message is one that contains an
incorrect routing instruction. This normally occurs
when the originating communications center assigns an
incorrect routing indicator during message header
preparation. Misrouted messages are usually not
discovered until they reach the communications center
of the called routing indicator. Communications
personnel of a tributary station in receipt of a misrouted
message must take the following actions:
Obtain the correct routing indicator, if possible;
Apply a header change to the misrouted message
and retransmit it to the correct routing indicator;
and
Originate a service message to the originating
station advising of the reroute action and the
correct routing indicator.
A missent message is one that contains a correct
routing indicator but is transmitted to a station other
than the one represented by the routing indicator.
Missent messages can be caused by an equipment
malfunction, incorrect switching, or operator error.
Communications personnel of a tributary station in
receipt of a missent message must take the following
actions:
Reintroduce the message into the AUTODIN
system as a suspected duplicate (SUSDUPE)
after applying a header change; and
Forward a routine service message to the
connected ASC citing the complete header and
time of receipt (TOR) and advising that the
message has been protected.
Suspected Duplicates
When a station suspects that a message may have
been previously transmitted, but definite proof or prior
transmission cannot be determined, the message should
be forwarded as a suspected duplicate (SUSDUPE) by
applying a header change. However, if a station
receives a message that is already marked
“SUSDUPE,” the station should file the message if the
message was previously received and delivered to the
addressee. If there is no indication that the message was
previously received and delivered, it should be
forwarded.
Stations receiving unmarked duplicate
transmissions should immediately forward a routine
service message to the originating station. This service
message should cite the complete header format of the
duplicated message, including the TOR of the original
and duplicate transmissions. If the initial copy was
delivered to the addressee, the station should file the
message.
Upon receipt of service messages concerning
duplicates, communications personnel at the
originating station must take the following actions:
Check transmission records to determine the
validity of the duplication report;
Ensure that in-station procedures are adequate to
guide operating personnel in the retransmission
of SUSDUPE messages;
Have maintenance personnel perform
equipment checks if an equipment malfunction
is suspected to be the cause of duplication; and
1-10
