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described above.
8.6.3.6.2 MESSAGE TRANSFER PROCEDURE
8.6.3.6.2.1 System category I3 message transfer provides
for message associated blocking with longitudinal checking
and modulo 8 numbered acknowledgements.
711 1/96
No. 71
Annex 10 - Aeronautical ~elecommunications Volume ZII
8.6.3.6.2.2 It is permissible for a transmission block to
be a complete mcssage or a portion of a message. The sending
station shall initialc thc lransmission with SOTB N followed
by:
a) SOH if it is the beginning of a message that contains
a heading;
b) STX if it is the beginning of a message that has no
heading;
c) SOH if it is an intermediate block that continues a
hcading;
d) STX if it is an intermediate block that continues a text.
Note.- SOTB N is the two-charucter rrunsmissian control
sequerzce DL& = (characters I/O, and 3/13) followed by the
block number; N, where N is one of rhe IA-5 characters 0,
1 ... 7 (churucters 3/0, 3/1 ... 317).
8.6.3.6.2.3 A block which ends at an intermediate point
within a message shall be ended with ETB; a block which
ends at the end of a message shall be ended with ETX.
8.6.3.6.2.4 It shall be permissible for each station to
initiate and con~inuc Lo send messages to tlie other
concurrently according to the following sequence.
a) It shall be pcrmissible for the sending station (master
sidc) to send blocks, containing messages or parts of
messages, continuously to the receiving station (slave
side) without waiting for a rcply.
b) It shall be permissible for replies, in the form of slave
responses, to be transmitted by the receiving station
while the sending station is scnding subsequent blocks.
Note.- By use of modulo 8 numbering of blocks
and replies, it shall be pernzissible for the sending
station to send as many as seven blocks dheud of the
received replies before being required to stop transmission
until six or less blocks are outstanding.
c) If a negative reply is received, the sending station
(tnaster side) shall start retransmission with the block
following the last block for which the proper affirmative
acknowledgement was received.
8.6.3.6.2.5 Slave responses shall be according to one of
the following;
a) if a transmission block is received without error and
the station is ready to rcceive another block, it shall
send DLE, a colon, an optional prefix, and the
appropriate acknowledgement ACKN (referring to thc
received block beginning with SOTB N, e.g. ACKO,
transmitted as DLEO is used as the affirmative reply to
the block numbered SOTBO; DLEl for SOTB1, etc.);
b) if a transmission block is not acceptable, the receiving
station shall send DLE, a colon, an optional prefix,
and NAK.
8.6.3.6.2.6 Recommendation.- Slave responses should
be irzterleaved between message blocks and rransmitted at the
earliest possible time.
8.6.3.6.3 LINK TERMINATION PROCEDLIRE
8.6.3.6.3.1 If the link has been establishcd for message
transfers in either or both directions, the sending of EOT by
a station shall signal the end of message trmsfers in that direction.
To resume message transfers after sending EOT, the link
shall be rc-established in that direction.
8.6.3.6.3.2 EOT shall only be transmitted by a station
after all outstanding slave responses have been received or
otherwise accounted for.
8.6.3.6.4.1 On switched connections, the data links in
both directions shall be terminated before the connection is
cleared. In addition, the station initiating clearing of the
connection shall first announce its intention to do so by
transn~itting the two-character scquence DLE EOT, followed
by any other signals required to clear the connection.
8.6.3.7 Description of SysKem category C (cerztralized).
System categoxy C (centralized) is one (like system category
A) in which a number of stations are connected by a
multipoint link and one station is designated as the control
station but (unlike system category A) provides only for
centralized (computer-to-terminal) operations where message
interchange (with replies) shall be constrained to occur only
between the control and a selected tributary station.
8.6.3.7.1.1 To establish thc link for transmission thc
control station shall either:
a) poll one of the tributary stations to assign it master
status; or
b) assume master status and select a tributary station to
assume slave status and rcceive a transmission according
to either of two prescribed selection procedures:
1) selection with response (see 8.6.3.7.1.5 below); or
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
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