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connection setup procedure has not been completed.
4.7.3.15.4.2 The selected value for the priority of data on
a connection in the IS0 8208 call accepted packet shall be
mapped .to the LIDU Q number passed to the link layer as
defined in Table 4-26. This value shall be used for the
remainder of the SNC.
4.7.3.15.4.3 If an invalid priority value is provided in the
call request or call accepted packet, the SSNDPX shall reject
the call. The diagnostic code in the clear indication packet
shall be set to "connection rejection - requested qualitjl of
service not available - (permanent condition)".
4.7.3.15.4.4 If priority of data on a connection is not
indicated in the call request packet, a default value (SNC
priority = 0) shall be used.
4.7.3.15.5 THROUGHPUT CLASS NEGOTIATION
4.7.3.15.5.1 The throughput class negotiation shall apply
independently for each direction of transfer.
4.7.3.15.5.2 Throughput
The throughput subparameter shall be defined as one of the
values (unspecified, 75, 150, 300, 600, 1 200, 2 400, 4 800,
9 600, 19 200, 48 000, 64 000 bitsls).
4.7.3.15-6.2 Aircraf-originated connection
establishment
4.7.3.15.6.2.1 The SSNDPA shall map directly the transit
delay selection and indication (TDSAI) facility in the call
request packet to the same facility in the connection request
SNPDU.
4.7.3.15.6.2.2 If the SSNDPG receives a call accepted
packet from the IWF in response to an incoming call packet
with TDSAI facility, it shill forward the same facility in the
connection confirm SNPDU to the SSNDPA.
4.7.3.15.6.3 Gmund-originated connection
estabIishment
If the SSNDPG receives a call request packet with the TDSAI
facility from the IWF, the SSNDPG shall forward to the
SSNDPA a mean value for the satellite subnetwork transit
delay of a data SNPDU of 131 octets in the connection request
SNPDU.
The fast select facility shall be treated as follows:
a) a call request packet without the fast select facility shall
be mapped to a connection request with no restriction on
response SNPDU with the fast select (use not permitted)
facility;
b) a call request packet with the fast select facility
indicating fast select requested with no restriction on
response shall be mapped to a connection request with
no restriction on response SNPDU without the fast
select (use not permitted) facility; and
c) a call request packet with the fast select facility
indicating fast select request with restriction on response
shall be mapped to a connection request with restriction
on response SNPDU without the fast select (use not
permitted) facility.
4.7.3.15.8 EXPE~TEDDAT A NEGOTIATION
The expedited data negotiation facility in the call request or
call accepted packet shall not be mapped to the corresponding
connection request or connection confirm SWDU unless the
facility parameter is set to "no use of expedited data".
211Uoo
No. 75
Part I Annex 10 - Aeronautical Telecommunications
4.7.3.15.9 CAUSEA ND DIAGNOSTIC CODES 4.7.3.16.4 PR~OR~TV
4.7.3.15.9.1 Clearing cause, resetting cause and
diagnostic code fields shall be transferred without modification
from the packets to the corresponding SNPDUs.
4.7.3.15.9.2 If the SSNDPX has initiated the clear or reset
procedure, then the clearing cause, the resetting cause and the
diagnostic code fields shall be set as defined in Tables 4-16
and 4-17.
4.7.3.15.10.1 If the user data field in the data packets of
an M-bit packet sequence is less than the default data SNPDU
maximum user data field length, then these fields shall be
concatenated to form an M-bit SNPDU sequence.
4.7.3.15.10.2 If the user data field in the data packets of
an M-bit packet sequence is greater than the default data
SNPDU maximum user data field length, then these fields
shall be segmented to form an M-bit SNPDU sequence.
4.7.3.16 SNPDU To PACKET
MAPPING RULES
4.7.3.16.1 This section shall specify the rules for mapping
the SNPDU fields into the corresponding fields in IS0 8208
packet.
4.7.3.16.2 DTE ADDRESS
4.7.3.16.2.1 The called DTE address and the calling DTE
address fields in the connection request SNPDU shall be
directly mapped into the called DTE address and the calling
DTE address fields in the incoming call packet.
4.7.3.16.2.2 Both the calling and called DE address
fields shall be regenerated when forwarding a call connected
packet, if they were present in the corresponding call request
packet.
4.7.3.16.3.1 The called NSAP address and the calling
NSAP address fields in the connection request SNPDU shall
　
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