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expires, it shall initiate a connection release procedure.
4.7.3.5.3.2 Other operation
If resources are not available, or a requested facility value is
not allowed, then the originating SSNDPX shall send a clear
indication packet to the TWE
4.7.3.5.4.1 Nonnal operation
4.7.3.5.4.1.1 When the SSNDPX receives a connection
request SNPDU from the remote SSNDPX, it shall place the
logical channe,l selected in the incoming call state. The
SSNDPX shall forward an incoming call packet to the IWF
using default values for any facilities which are not Eansmitted
over the satellite subnetwork (see 4.7.3.16).
4.7.3.5.4.1.2 When the SSNDPX receives a call accepted
packet from the W, it shall forward a connection confirm
SNPDU to the remote SSNDPX and place the logical channel
in the data transferlflow control state (flow control readylno
remote or local intermpt pending) when it receives from the
interfacing link layer the information that the connection
confirm SNPDU has been processed (receipt of faiYsuccess
EIDU).
4.7.3.5.4.2 Other operation
4.7.3.5.4.2.1 If the receiving SSNDPX cannot support
the request, then it shall transmit a connection released
SNPDU to the originating SSNDPX.
4.7.3.5.4.2.2 If a selected facility value is not allowed,
then the receiving SSNDPX shall initiate a connection release
procedure.
4.7.3.6 CONNECTIORNE LEASE
Note.- A subnetwork connection may be released at any
time by any party once the logical channel is in the data
tmnsfel; IWF call request, or iucoming call states. The
conneciion released SNPDU may contain user data (128 octets
maximum) provided by the IWF.
Annex 10 - Aeronautical Teleconrmunications Volume III
4.7.3.6.1 User data shall be transparently forwarded in
both directions.
4.7.3.6.2 The SSNDPX shall guarantee in-sequence
transmission between data1 interrupt SNPDUs already
forwarded to the link layer and a subsequently transmitted
connection released or connection release complete SNPDU.
4.7.3.6-3 LOCALLY ORIGINATED
4.7.3.6.3.1 When the SSNDPX receives a clear request
packet from the IbT, it shall place the logical channel in the
local clear request state, generate a connection released
SNPDU, and forward it to the remote SSNDPX. The only
SNPDUs it shall then accept, are a connection released
SNPDU or a connection release complete SNPDU. It shaIl
discard all other SNPDUs. The SSNDPX shall also consider
the receipt of any packet other than a clear request packet as
an error, and shall discard it.
4.7.3.6.3.2 When the SSNDPX receives a connection
release complete after the connection released has been
successfully sent, it shall return the logical channel to the
ready state. If the SSNDPX receives a connection released
SNPDU from the remote SSNDPX, it shall not expect to
receive a connection release complete SNPDU.
4.7.3.6.3.3 If the SSNDPX does not receive a response
from the remote SSNDPX before the associated timer (see
tN6, Table 4-18) expires, it shall return the logcal channel to
the ready state.
When the SSNDPX receives a connection released SNPDU, it
shall enter the remote clear request state, and forward a clear
indication packet to the TWE It shall also construct a
connection release complete SNPDU, send it to the remote
SSNDPX, and return the logical channel to the ready state.
4.7.3.7.1 The data transfer procedure shall apply
independently to each logical channel which is in the data
transfer/flow 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 I. 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 more
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 SNPDU of the same
sequence of data SNPDUs and shal1 forward them to the
:emote SSNDPX.
Nore.- The number of data SNPDUs needed in the
sequence depends on the amount of user data in the data
packets which belong to the M-bit packet sequence.
　
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