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confirm .SNPDU; otherwise, the SSNDPX shall discard the
interrupt packet.
4.7.3.7.4.3.2 Upon receipt of an interrupt confirm
SNPDU, the SSNDPX shall generate an interrupt confirmation
packet and forward it to the IWF.
4.7.3.7.4.3.3 If the SSNDPX does not 'receive the
interrupt confirm SNPDU before the associafed 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 intermpt packet to the TWE
4.7.3.7.4.4.2 When the SSNDPX receives an intempt
confirmation packet from the IWF, it shall construct an
interrupt confirm SNPDU, and send it to the remote SSNPDX.
4.7.3.8 CONNECTIORIEVS ET
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 logcal 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 shoutd be extended to the IWF
4.7.3.8.2 RESET ACTION
During the reset process, the following actions shall be taken
by the SSNDPX with respect to its data transfer operation:
Annex 10 - Aeronauh'cal Telecommunications Volume ZZZ
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
receivingftransmitting a reset SNPDU but which do not
constitute an M-bit SNPDG sequence shall be flushed
from the reassembly area;
C ) the expected (data) SNPDU number shall be reset to
0 and subsequently transmitted data SNPDUs shall be
numbered starting from 0; and
d) any outstanding interrupt SNPDU to or from the
remote SSNDPX remains unconfirmed and tN4 is
stopped.
channel to the data transfer state when it has received from the
link layer the information that the reset confirm SWPDU has
been successfully transmitted.
4.7.3.8.3.5 Simultuneous reset
If the SSNDPX sends a reset SNPDU and subsequently
receives a reset SNPDU it shall:
a) not send a reset confirm SNPDU; and
b) not expect to receive a reset confirm SNPDU.
Note.- Errors which are recognized by the SSNDPX may
be the result of the following events:
4.7.3.8.3 RESET PROCEDURES
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
reset or reset confirm SNPDU.
4.7.3.8.3.3 hcally/SSNDPX originated
When the originating SSNDPX receives a
- channel degradation or loss of synchronization
- AES.log-off
- a GES-to-GES handover
- link congestion
- an uncorrected transmission error
- u remote SSNDPX protocol error
- a protocol error in the IWFBSNDPX interface
procedure
4.7.3.9.1 When an error as noted in Tables 4-22 to 4-24
is detected, the SSNDPX shall initiate either reset or release
of the relevant connection.
reset request packet from the IWF or when it has detected an
error for which its action is to reset the SVC, it shall place the
4.7.3.9.2 Errors shall be notified to the IWF by means
of cause and diagnostic parameters within the relevant packet.
logical channel into the local reset state, execute the reset
Errors shall be notified to the remote SSNDPX by using the
action. transmit a reset SNPDU to the remote SSNDPX, and
corresponding fields of the SNPDUs, i.e. reset or release cause
start a timer tN3 (see Table 4-18). I f required by the error
and diagnostic code.
procedures in 4.7.3.9, the SSNDPX shall forward a reset
indication packet to the TWE 4.7.3.9.3 The coding of the cause fields which are
4.7.3.8.3.3.2 Upon receipt of the reset confirm SNPDU
generated by the SSNDPX and passed to the remote SSNDPX
shall be as defined in Table 4-16.
from the remote SSNDPX, it shall return the logical channel
to the data tmnsferfflow control state. 4.7.3.9.4 The coding of the corresponding SSNDPX gene-
4,7.3.8.3.3.3 If the SSNDPX does not receive a response ~atedd iagnostic code field shall be as defined in Table 4-17.
from the SSNDPX before the associated timer (see t . 3 in
Table 4-18) expires, it shall initiate a connection release
procedure.
4.7.3.8.3.4 Remotely originared
Note.- The procedures for log-on and log-off are covered
in 4.7.6.
　
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