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shall apply for format definitions, diagnostic and cause codes, 4.7.4.3.6.1 Table 4-35 covers these circu~nstances and the
facility regiskation protocols (if used), and flow control on the action that the DCE shall initiate upon the expiration of that
IS0 8208 interface. time.
2/11/00
No. 75
Annex 10 - Aeronautical Telecommunications Volume 111
The AES DCE shall support at least eight simultaneous,
independent logical channels.
A logical channel of the lowest priority and the associated
virtual call shall be cleared as necessary to accept a request for
higher priority service.
Note.- Logical channels and virtual calls huve a priority
level of 0 unless the IS0 8208 prioriiy facility was invoked
during call set up.
4.7.5 Interworking function
4.7.5.1 SSNDPXflWF INTERFACE
4.7.5.1.1 The IS0 8208 packets exchanged between the
IWF and the SSNDPX shall be as defined in Table 4-36.
4.7.5.1.2 INCOAIING CALL
PACKET HANDLING
The IWF shall forward the incoming call packet with the
expedited data negotiation facility and "use of expedited data"
parameter to the appropriate IS0 8308 DCE entity.
Note.- If the facility parameter is "no use of expedited
data", the IWF forwards the incoming call packet with or
without this facility.
4.7.5.1.3 CALL CONNECTED
PACKET HAh'DUNG
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.- I f the expedited data negotiation facility parameter
is set to "no use of expedited data", the IWF forwads the call
connected packet with or without this facility.
4.7.5.1.4 CLUR INDICATION
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.
4.7.5.1.5 DATA,I K~ERRUPIIr: m~mu~r
CONFIRMATlON AND RESET
INDICATION PACKET HANDLING
4.7.5.1.5.1 Data, intermpt, intermpt 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 DCMWF
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.
4.7.5.2.2 CALL REQUEST
PACKET HANDWNG
If the call request 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 request pacht 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 CALLA CCEPTED
PACKET HANDLING
If the call accepted packet does not conrain 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 TWF 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 CLEAR REQUEST
PACKET HANDLING
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, INTERRUPT
CONFIRMATION AND RESET REQUEST
PACKET HANDLING
Data, intermpt, intermpt 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.
2/ll/Oo
No. 75
Part I Annex 10 - Aemnautical Telecommunications
4.7.5.3 (Resewed)
4.7.5.4 IS0 8208 LOGICAL
CHANNEL AND SSNDPX LOGICAL
CHANNEL ASSOCIATION
Note.- I S 0 8208 DCE logical channel ident$er andthe
SSNDPX logical channel number of an SNC need not be
identical.
Note.- This may be accomplished, for example, by passing
the C;ES/satellite ID from the AES to the routing function
containing a lookup table for translation to DTE address(es),
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