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packet from the IWF, it shall allocate a logical channel which
is in the ready state, forward the call request packet to the
remote SSNDPX by means of a connection request SNPDU
and place the logical channel into the IWF call request state.
4.7.3.5.3.1.2 If the call is accepted at the remote
SSNDPX, a connection confirm SMPDU is received. The
SSNDPX shall then place the logical channel in the data
transferlflow control state (flow control ready1110 remote or
local interrupt pending) and forward a call connected packet to
the IWF. The call connected packet shall use default values (if
any) for the facilities which are not transmitted over the
satellite subnetwork, according to the SNPDU to packet
mapping rules defined in 4.7.3.16.
4.7.3.5.3.1.3 If the SSNDPX does not receive either a
connection confirm or connection released SNPDU from the
remote SSNDPX before the timer (see tN1, Table 4-18)
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 SSNJ2PX shall send a clear
indication packet to the IWF.
4.7.3.5.4.1 Norm1 operution
4.7.3.5.4.1.1 When the SSNDPX receives. a connection
request SNPDU from the remote SSNDPX, it shall place the
logical channel 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 transmitted
over the satellite subnetwork (sse 4.7.3.16).
4.7.3.5.4.1.2 When the SSNDPX receives a call accepted
packet from the lWF, it shall forward a connection confirm
SNPD'U to the remote SSNDPX and place the logical channel
in the data transferlflow control state (flow control readylno
remote or local interrupt pending) when it receives from the
interfacing link layer the information that the connection
confirm SNPDU has been processed (receipt of faiVsuccess
LIDU).
4.7.3.5.4.2 Other operution
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 CONNECTION RELEASE
Note.- A subnetwork connection m y be released nt any
time by any party once the logicul channel is in rhe datu
transfel; IWF call request, or incoming call states. The
connection released SNPDU may contain user data (128
octets ~rurximump) rovided by the IWE
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 SNPDIJs already
forwarded to the link layer and a subsequently transmitted
connection released or connection release complete SNPDTI.
4.7.3.6.3.1 When the SSNDPX: receives a clear request
packet from the IWF, 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 C O M ~ C ~r~elOea~se complete SNPDU. It shall
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 i t
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.
2/1UQO
No. 75
Part I Annex 10 - Aeron~utical ~e~ecommunications
4.7.3.6.3.3 ,If the SSKDPX does not receive a response
from the remote SSNDPX before the associated timer
(see tN6, Table 4-18) expires, it shall return the logical 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 IWF. It shall also construct a
connection release complete SNPDU, send it to the remote
SSNDPX, and return the logical channel. to the ready state.
Note.- The number of data SNPDUs needed in the
sequence depends on the amount of user data in the data
packets which b~longto the M-bit packet sequence.
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
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