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a) not send a reset confirm SNPDU; and
b) not expect to receive a reset confirm SNPDU.
4.7.3.9 ERROR PROCEDURES
Note.- Errors which ure recognized by the SSNDPX may
be the result of the following evefits:
- channel degradation or loss of synchron&ation
- AES log-@
- a GES-to-GES handover
- link congestion
- an uncorrected transmission error
- a remote SSNDPX protocol error
- a protocol ermr in the IWF/SSNDPX 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.
4.7.3.9.2 Errors shall be notified to the IWF by means of
cause and diagnostic parameters within the relevant packet.
Errors shall be notified to the remote SSNDPX by using the
corresponding fields of the SNPDUs, i.e. reset or release cause
and diagnostic code.
4.7.3.9.3 The coding of the cause fields which arc
generated by the SSNDPX and passed to the remote SSNDPX
shall be as defined in Table 4-1 6.
4.7.3.9.4 The coding of the corresponding SSNDPX
generated diagnostic code field shall be as defined in
Table 4- 17.
Note.- The procedures for log-on and log-of are covered
in 4.7.6.
4.7.3.9.6 ORIGINATING SSNDPX ERROR RECOVERY
4.7.3.9.6.1 Transmission error resulting from the loss or
delay of SNPDUs shall be detected either by time-out when a
response is expected or by the fail LDU reported by the link
layer.
4.7.3.9.6.2 The actions the SSNDPX follows upon timeout
shall be as summarized in Table 4-18.
4.7.3.9.6.3 The actions the SSNDPX shall follow when it
is informed by the link layer that the transmission of an
SNPDU has failed shall be as summarized in Table 4-19.
Receipt of a fail (datdintermpt) LIDU while the relevant LCN
is either in locallremote reset state or locallremote clear
request state, shall not cause the SSND sub-layer entity to
generate a (further) connection reset.
Note.- n o types of protocol e m r may occur at the
SSNDPX. These are:
aj a syntactical error which occurs when a received
SNPDU does rwt conform to the fonnat specifications
over the satellite subnetwork; and
b) a logical error which occurs when the SSNDPX receives
from its peer entity an SNPDU that is not on acceptable
input to the current state of the logic01 channel.
4.7.3.9.7.1 When the SSNDPX detects a protocol error, it
shall respond as indicated in Tables 4-21 to 4-24. These tables
a~ depicted for each logical channel state.
4.7.3.9.8 OUT-OF-SEQUENCE DATA
SNPZ) u PROCEDURE
4.7.3.9.8.1 The SSNDPX shall process received data
SNPDUs in proper sequence, according to SNPDU number to
construct data packets to be forwarded to the WE The
SSNDPX shall discard duplicate SNPDUs.
Note.- The receiving link layer at the GES may deliver
SNPDUs to the SSNDPG it1 altered sequence. The SSNDPG
assembles data SNPD Us in proper sequence before forwarding
them to the IWF.
2/1l/M)
No. 75
Annex 10 - .4erortautical Telecontmunications Volume I11
4.7.3.9.8.2 SSNDPG actions fur
out-of-sequence data SNPDUs
Note.- In the following sections, fields are dejned in the
order they may appear in the relevant SNPDU.
A data SNPDU shall be defined as out of sequence if and only
if its SNPDU number does not immediately follow the 4.7.3.10.2 CONNECTIORNE QUEST SWDU
SNPDU number of the last received data SNPDU that has been
used in creating the last data packet. 4.7.3.10.2.1 The format of connection request SNPDU
shall be as defined in Figure 4-14.
Note.- SNPDU numbers are incnlmented modulo 256.
Thus. SNPDU number 0 follows SNPDU number 255.
4.7.3.10.2.2 SNPDU type identifierJield
4.7.3.9.8.2.1 If an out-of-sequence data SNPDU is not a
duplicate, the SSNDPG shall store the out-of-sequence data 4.7.3.10.2.2.1 Bits 1, 2, 3 and 6 shall be the following
SNPDU. If no more storage is available, the SSNDPG shall indicator bits;
place the logical channel in the reset state and extend the reset
to the IWE a) bit 1, facilities field present;
4.7.3.9.8.2.2 Stored data SNPDUs shall be processed to b) bit 2, called NSAP address present;
create data packets whenever this can be done without creating
an out-of-sequence condition. Data packets shalI be forwarded c) bit 3, calling NSAP address present; and
to the IWF as soon as possible.
d) bit 6, fast select with restriction on response.
4.7.3.9.8.3 SSNDPA acti01i.s for
out-of-sequence SNPDUs 4.7.3.10.2.2.2 Bits 1, 2 and 3 shall be set to 1 if the
corresponding fields are present in the connection request
If a data SNPDU is received which is not a duplicate but has SNPDU; otherwise, they shall be set to 0. Bit 6 shaII be set to
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