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2) Fast select (see 8.6.3.7.1.7 below). 8.6.3.7.2.2 The message transmission shall:
8.6.3.7.1 2 Polling is accomplished by the control station a) begin with:
sending a pollil?g supervisory sequence consisting of a prefix
identifying a single tributary station and ending in ENQ. - SOH if the message has a heading,
8.6.3.7.1.3 A uibutary station detecting its assigned - STX if the message has no heading;
polling supervisory sequence shall assume master status and
respond in one of two ways: and
a) if the station has a message to send, it shall initiate
message transfer. The control station assumes slave
status;
b) if the station has no message to send, it shall send
EOT and master status shall revert to the control
station.
8.6.3.7.1.4 If the control station detects an invalid or no
response resulting from a poll, it shall terminate by sending
EOT prior to resuming polling or selection.
8.6.3.7.1.5 Selection with response is accomplished by
the control station assuming master status and sending a selection
supervisory sequence consisting of a prefix identifying a
single tributary station and ending in ENQ.
8.6.3.7.1.6 A tributary station detecting its assigned
selection supervisory sequence shall assume slave status and
send one of two replies:
a) if the station is ready LO receive, it shall send an
optional prefix followed by ACK. Upon detecting chis
reply, the master station shall proceed with message
transfer;
b) if the station is not ready to receive, it shall send an
optional prefix followed by NAK. Upon detecting
NAK, it shall be pennissible for the master station to
again attempt selecting the same tributary station or
initiate termination by sending EOT.
Note.- the control station receives an invalid or no
reply, it is permitted to attempt again to select the sume tributaty
or ufter N rerries (N L 0) either to exit to a recovery
procedure or to initiate tennination by sending EOT
8.6.3.7.1.7 Fast select is accomplished by the control
station assuming master status and sending a selection supervisory
sequence, and without ending this transmission with
ENQ or waiting for the selected tributary to respond, proceeding
directly to message transfer.
8.6.3.7.2 MESSAGE TRANSFER PROCEDURE
b) be continuous, ending with ETX, immediately
followed by BCC.
8.6.3.7.2.3 The slave station, upon detecting ETX followed
by BCC, shall send one of two replies:
a) if the messages were accepted and the slave station is
ready to receive another message, it shall send an
optional prefix followed by ACK. Upon detecting
ACK, the master station shall be permitted either to
transmit the next message ox initiate termination;
b) if the message was not accepted and the slave station
is ready to receive another mcssage, it shall send an
optional prcfix followed by NAK. Upon detecting
NAK, the master station may either transmit another
message or initiate termination. Following the NAK
reply, the next message transmitted need not be a
retransmission of the message that was not accepted.
8.6.3.7.2.4 If the master station receives an invalid or no
reply to a message, it shall be permitted to send a deljvery
verification supervisory sequence consisting of an optional
prefix followed by ENQ. Upon receipt of a delivery verification
supervisory sequence, the slave station repeats its last
reply.
8.6.3.7.2.5 N retries (N 2 0) may be made by the master
station in order to get a valid slave reply. If a valid reply is
not received after N retries, the master station exits to a
recovery procedure.
8.6.3.7.3 LINK TERMINATION PROCEDURE
8.6.3.7.3.1 The station with master status shall transmit
EOT to indicate that it has no more messages to transmit. EOT
shall negate the masterlslave status of both stations and return
master status to the control station.
8.6.4 Ground-ground bit-oriented data
link contml procedures
8.6.3.7.2.1 The station with master status shall send a Note.- The provisiorzs of this section pertain to groundsingle
message to the station with slave status and wait for a ground data interchange applicarions using bit-oriented data
reply. link corltrol procedures enabling rransparent, synchronous
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume I12
transmission that is independent of any encoding; data link
control finctions urn acconzplished by interpreting designated
bit positions in the trunsnzission envelope of a frame.
8.6.4.1 The following descriptions shall apply lo data
link applications contained in this section:
a) Bit-otlented data link control procedures enable transparent
　
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