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4.7.3.7.2.3.3 The SSNDPX shall also assign an SNPDU
number to each data SNPDU. SNPDU numbers shall be
consecutive over a given connection. The sequence numbering
of data SNPDUs shall be performed modulo 256 and the
SNPDU numbers shall cycle through the entire range from 0
through 255. The first data SNPDU to be transmitted over the
satellite link, when the logical channel has just entered the
flow control ready state, shall have an SNPDU number equal
to 0.
4.7.3.7.2.4 Remotely originated
If the SSNDPX entity needs to disconnect a connection, it
shall place the logical channel in the local clear request state,
send a clear indication packet to the IWF and transmit a
connection released SNPDU to the remote SSNDPX. It
expects to receive as a response from the remote SSNDPX a
connection release complete SNPDU or connection released
SNPDU, and shall return the logical channel to the ready state
when the expected response is received or timing supervision
expires (see tN6, Table 4-20).
4.7.3.7.2.4. I An M-bit SNPDU sequence received from
the remote SSNDPX shall be forwarded as an M-bit packet
sequence to the IWE
4.7.3.7-2.4.2 Upon receipt of an M-bit SNPDU
sequence, the SSNDPX shall generate an M-bit packet
sequence, using the M-bit to indicate a following ~ackeotf the
same sequence as required and forward it to the IWE
Part I Annex I0 - Aeronautical Telecommunications
Note.- The number of data packets needed in the M-bit
packet sequence depends on the amount of user data in the
M-bit SNPDU sequence and the packer size.
4.7.3.7.2.4.3 If a data SNPDU is received which
contains less than the maximum size and with M-bit = 1 and
D-bit = 0, then the SSNDPX sha1.l initiate a reset procedure
(see 4.7.3.8.2.1).
4.7.3.7.3.1 Flow 'control shall be provided within the
SSNDPX to prevent the overflow of data buffers.
4.7.3.7.3.2 To interrupt the flow of data, the receiving
SSNDPX shall generate a flow control SNPDU with its flow
control reason field set to suspend and transmit it to the
remote SSNDPX. The SNPDU number in the flow control
(suspend) SNPDU shall be set to the ShTDU number of the
last received and accepted data SNPDU. If there a e any
out-of-sequence data SNPDUs in the SSNDPG, the SNPDU
number in the flow control SNPDU with its reason field set to
suspend shall be set to the SNPDU number of the SNPDU
received and accepted before the out-of-sequence SNPDU.
When subsequently the receiving SNDPX is able to resume
the data transfer, it shall transmit a flow control SNPDU with
its flow corm-01 reason field set to resume.
4.7.3.7.3.3 When the SSNDPX receives a flow control
SNPDU with its flow conmol field set to suspend, it shall stop
transmitting data SNPDUs on the indicated logical channel. If
the SNPDU number in the flow control (suspend) SNPDU is
other than that of the last data SNPDU transmitted and the data
SNPDU with SNPDU number equal to the SNPDU number in
the flow control (suspend) SNPDU plus one modulo 256 is no
longer in the data buffer. the SSNDPX shall initiate a reset of
the logical channel. When the SSNDPX receives a flow control
SNPDU with its control field set to resume. it shall restart
bnsmitting data ShTDUs on the indicated logical channel. The
first (rejtransmltted data SNPDU shall have its SNPDU number
equal to the Sh'PDU number of the previously received flow
control SNPDU (suspend) plus one modulo 256, unless a reset
procedure has been invoked.
4.7.3.7.3.4 If the receiving SSNDPX is not able to
resume data transfer before the associated timer (see tN7 in
Table 4-18 and Table 4-20) expires, it shall initiate a reset of
the logical channel.
4.7 3.7.4 EXPEDITED DAT4 TRANSFER
Note.- The expedited data rrnnsfer allows an SSNDPX ro
transmit user data contained in an interrupt packer to the
remote SSNDPX, bypassing any flow- control that may Iuzve
been applied by, subnem'ork layer entities.
4.7.3.7.4.1 The expedited data transfer procedure shall
apply independently to each logical chamel 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 intermpt SNPDU at a time, with a
maximum user data length of 32 octets, shall be permitted in
each direction.
4.7.3.7.4.3 Locally originated
4.7.3.7.4.3.1 When the originating SSNDPX receives an
interrupt packet from the IWF and provided there is no
pre-existing interrupt SNPDU awaiting interrupt confirm
SNPDU, the SSNDPX shall then generate an interrupt SNPDU
and forward it to the remote SSNDPX, and await an intermpt
　
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