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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
4.7.3.6.5 s m x 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 DATA TRANSFER
4.7.3.7.1 The data transfer procedure shall apply
independently to each logical channel which is in the data
transfedflow control state.
4.7.3.7.2 DATA TRANSFER PROCEDURE
4.7.3.7.2.1 Data shall be forwarded transparently and in
sequence between the SNS users.
4.7.3.7.2.2 An M-bit SNPDU sequence shall consist of a
sequence of one or more data SNPDUs. Each data SNPDU
except the last one, shall contain the maximum 503 octets of
user data and its M-bit shall be set to 1. The user data field of
the last SNPDU which belongs to the sequence may have less
than the maximum length and shall have its M-bit set to 0.
4.7.3.7.2.3 Locally originated
4.7.3.7.2.3.1 An M-bit packet sequence received from the
IWF shall be forwarded as an M-bit SNPDU sequence to the
remote SSNDPX.
4.7.3.7.2.3.2 Upon receipt from the IWF of one or inore
data packets belonging to one M-bit packet sequence, the
SSNDPX shall generate one or more data SNPDUs, using the
M-bit to indicate a following data ShTDU of the same
sequence of data SNPDUs and shall forward them to the
remote SSNDPX.
4.7.3.7.2.4.1 An M-bit SNPDU sequence received from
the remote SSNDPX shall be forwarded as an M-bit packet
sequence to the IWF.
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 packet of the same sequence
as required and forward it to the TWF.
Note.- The number of data packets needed in the M-bit
packet sequence depends on the amount of user duta in the
M-bit SNPDU sequence and the packet 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 shall 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 intempt 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 SNPDU number of the last received
and accepted data SNPDU. If there are any out-of-sequence
data SNPDUs in the SSNDPG, the SNPDU number in the ilow
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 coiitpol reason
field set to resume.
4.7.3.7.3.3 When the SSNDPX receives a flow control
SNPDU with its flow control field set to suspend, it shall stop
transmitting data SNPDUs on the indicated logical cl~annel.I f
the SNPDU number in the flow control (suspend) SNPDU is
other than that of the last data SNPDU transmitted and the data
211 1/00
No. 7s
Annex I0 - Aeronarrtical l'elecommunicalions Volume ZZZ
SNPDU with SNPDU number equal ro the SNPDU numher in
the flow control (suspend) SNPDU plus one modulo 256 is nu
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 transmitting data SNPDUs on the indicated logical
channel. The first (re)transmitted data SNPDU shall have its
SNPDU number equal to the SNPDU 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
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