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channel.
4.7.3.7.4 EXPEDITEDDA TA TWSFER
Note.- The expedited data transfer allows an SSNLIPX to
trammir user data contained in an interrupt packet to the
remote SSNDPX, hjlpassing any flow control that may have
beerz applied by subrlehvork layer entities.
4.7.3.7.4.1 The expedited data transfer procedure shall
apply independently to each logical channel which is in the
data transfer state and shall not be initiated when a release or
reset procedure is in process.
4.7.3.7.4.2 Only one interrupt SNPDU at a time, with a
maximum user data length of 32 octets. shall be permitted in
each direction.
4.7.3.8 CONNECTION RESET
4.7.3.8.1 When the SSNDPX detects an error in the
SSNDPX operation for which its action is to reset the virtual
circuit (see Table 4-24), then it shall place the logical channel
into the local reset state, carry out the reset procedure and
transmit a reset SNPDU to the remote SSNDPX.
Note.- The cause and diagnostic codes indicate whether
the reset should be carried out within the satellite subnetwork
alone or should be extended to the IWE
During the reset process, the following actions shall be taken
by the SSNDPX with respect to its data transfer operation:
a) the SNPDUs which have not yet been passed to the link
layer shall be discarded;
b) the SNPDUs that have been received prior to
receiviig/transmitting a reset SNPDU but which do not
constitute an M-bit SWDU sequence shall be flushed
from the reassembly area;
c) the expected (data) SNPDU number shall be reset Lo 0
and subsequently transmitted data SNPDWs shall be
numbcred starting from 0; and
d) any outstanding intermpl SNPDU to or from the remote
SSWPX remains unconfirmed and &is stopped.
4.7.3.7.4.3.1 When the originating SSNDPX receives an 4.7.3.8.3 RESET PROCEDURES interrupt packet from the IWF and provided there is no
pre-existing interrupt SKPDU awaiting intermpt confirm
SNPDU, the SSNDPX shall then generate an interrupt SNPDU
and fotward it to the remote SSNDPX. and await an interrupt
confirm SNPDU; otherwise, the SSNDPX shall discard the
interrupt packet.
4.7.3.7.4.3.2 Upon receipt of an intermpt confirm
SNPDU, the SSNDPX shall generate an intempt confirmation
packet and forward it to the IWF.
4.7.3.7.4.3.3 If the SSNDPX does not receive the
intermpt confirm SNPDU before the associated timer (see tN4
in Table 4-18 and Table 4-20) expires, it shall initiate a reset
of the logical channel.
4.7.3.7.4-.4 Remotely originated
4.7.3.7.4.4.1 When the SSNDPX receives an interrupt
SNPDU, it shall forward an interrupt packet to the WF.
4.7.3.8.3.1 The reset procedures shall apply only to
logical channels that are in the data transfer state.
4.7.3.8.3.2 The SSNDPX shall guarantee in sequence
transmission between datalintempt SNPDUs already forwarded
to the link layer and a subsequently transmitted rcset
or reset confirm SNPDU.
4.7.3.8.3.3 &ocally/SSNDPX originated
4.7.3.8.3.3.1 When the originating SSNDPX receives a
reset request packct from the IWF or when it has detected an
emr for which its action is to reset the SVC, it shall place the
logical chmel into the local reset state, execute the reset
action, transmit a reset SNPDU to the remote SSNDPX, and
start a timer tN3 (see Table 4-18). If required by the error
procedures in 4.7.3.9, the SSNDPX shall forward a reset
indication packct to the IWF.
4.7.3.7.4.4.2 When the SSNDPX receives an interrupt 4.7.3.8.3.3.2 Upon receipt of the reset confirm ShTDU
confirmation packet from the IWF, it shall coristruct an from the remote SSNDPX, it shall return the logical channel
interrupt confirm SNPDU, and send it to the remote SSNPDX. to the data transfer/flow control state.
Part 1 Annex 10 - Aeronautical Telecommunications
4.7.3.8.3.3.3 If the SSNDPX does not receive a response
from the SSNDPX before the associated timer (see tN3 in
Table 4-18) expires, it shall initiate a connection release
procedure.
4.7.3.8.3.4 Remotely originated
4.7.3.8.3.4.1 When the SSNDPX receives a reset SNPDU,
it shall place the logical channel into the remote reset state,
execute the reset action and transmit a reset indication packet
to the IWF as required (see Table 4-24).
4.7.3.8.3.4.2 The SSNDPX shall transmit a reset confirm
SNPDU to its remote SSNDPX and shall return the logical
channel to the data transfer state when it has received from the
link layer the information that the reset confirm SNPDU has
been successfully transmitted.
4.7.3.8.3.5 Simultaneous reset
If the SSNDPX sends a reset SNPDU and subsequently
receives a reset SNPDU it shall:
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