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expedited data negotiation facility and "use of expedited data"
parameter to the appropriate IS0 8208 DCE entity.
Note.- I f the facility parameter is "no use of expedited
data", the IWF fonvards the incoming call packet with or
without this facility.
4.7.5.1.3 CALL CONNECTED
PACKET HANDUNG
If the parameter of the expedited data negotiation facility is set
to "use of expedited data" in the call connected packet, the
IWF shall forward this facility and its parameter with the
packet to the appropriate IS0 8208 DCE entity. For each
virtual call, the IWF shall associate the SSNDPX logical
channel with the corresponding IS0 8208 DCE logical
channel.
Note.- Zfthe expedited data negotiation facility parameter
is set to "no use of expedited data", the ZWF forwards the call
connected packet with or without this facility.
4.7.5.1.4 CLEARI NDICATION
PACKET HANDLING
4.7.5.1.4.1 The IWF shall disassociate the SSNDPX
logical channel with the corresponding IS0 8208 DCE
logical channel and forward the packet to the IS0 8208 DCE
entity. '
Annex XO - Aeronautical Telecommunications Volame 111
4.7.5.1.5 DATA, INTERRUPT, INTERRUPT
CONFIRMATIOhl AND RESET
INDlCATION PACKET HANDLING
4.7.5.1.5.1 Data, interrupt, interrupt confirmation and
reset indication packets shall be forwarded to the appropriate
IS0 8208 DCE entity based on the logical channel association
established after the completion of a connection
establishment.
4.7.5.2 IS0 8208 DCEflWF
INTERFACE
4.7.5.2.1 The IS0 8208 packets exchanged between the
IWF and the IS0 8208 DCE shall be as defined in Table 4-37.
The IWF shall forward the connectivity notification event
messages to the appropriate IS0 8208 DCE logical channel.
4.7.5.4 Is0 8208 LOGICAL
CHANNEL AND SSNDPX LOGICAL
CHANNEL ASSOCIATION
Note.- IS0 8208 DCE logical channel identifier and the
SSNDPX logical chmnel number of an SNC need not be
identical.
4.7.5.5 DATA TRANSFER PROCEDURES
4.7.5.5.1 FLOW C0,WROL
4.7.5.2.2 CALL REQUEST PACKET HANDLING
If the call request packet does not contain the expedited data
negotiation facility, the IW'F shall add this facility with its
parameter set to "no use of expedited data" to the packet and
shall forward it to the appropriate SSNDPX entity; otherwise,
the IWF shall forward the call request packet with this facility
and parameter. If the optional called DTE address is invalid,
then the IWF shall return a clear indication packet to the IS0
8208 DCE entity.
4.7.5.2.3 CALL ACCEPTED PACKET HANDLJNG
If the call accepted packet does not contain the expedited data
negotiation facility, the IWF shall add this facility with its
parameter set to "no use of expedited data" to the packet and
shall forward it to the appropriate SSNDPX entity: otherwise,
the IWF shall forward the call accepted packet with this
facility and parameter. For each virtual call, the IWF shall
associate the IS0 8208 DCE logical channel with the corresponding
SSNDPX logical channel.
4.7.5.2.4 CLEARR EQUEST PACKET HANDLJNG
The IWF shall disassociate the IS0 8208 DCE logical channel
with the corresponding SSNDPX logical channel and forward
the packet to the SSNDPX entity.
4.7.5.2.5 DATA, INTERRUPT, ~NTERRUPT
CONFIRMATION AND RESET REQUEST
PACKET HAXD LING
Data, interrupt, interrupt confirmation and reset request packets
shall be forwarded to the appropriate SSNDPX entity based on
the logical channel association established after the completion
of a connection establishment.
Flow control shall be applied between the SSNDPX and the
IS0 8208 DCE to prevent storage overflow.
4.7.5.6 CAUSE AND DIAGNOSTIC CODE
4.7.5.6.1 The IWF shall replace the cause "local
procedure error" in IS0 8208 packets received from the DCE,
by the cause "remote procedure error'' before forwarding them
to the SSNDPX. The IWF shall replace the ,cause 'Llocal link
emor" in an SNPDU received from the SSNDPX by the cause
"network congestion" before forwarding them to the DCE. All
other causes shall be transfemed without modification.
4.7.5.6.2 Diagnostic codes shall be transferred without
modification.
4.7.6 Management interface
4.7.6.1 AES MANAGEMENT INTEWACE
4.7.6.1.1 The changes in log-on sratus conveyed from
the AES management to the SSNL shall be as defined in
4.9.2.1 -1.
4.7.6.1.2 When the AES either logs-off or otherwise
terminates communication with a GES, the AES SSNL shall
clear all connections with this GES.
4.7.6.1.3 CONNECTIVITY NOTIFICATION EVENT
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