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values (unspecified, 75, 150, 300, 600, 1 200, 2 400, 4 800,
9 600, 19 200, 48 000, 64 000 bits/s).
4.7.3.16.6 TRANS~T DELAY
4.7.3.16.6.1 The negotiated transit delay shall apply to
both directions of transfer.
4.7.3.16.6.2 Aircraft-originated connection
establishment
4.7.3.16.6.2.1 Lf the SSNDPG receives a connection
request SNPDU from an SSKDPA with TDSAI facility, the
SSNDPG shall forward to the IWF a mean value for satellite
subnetwork transit delay of a data SNPDU of 13 1 octets in the
incoming call packet. -
4.7.3.16.6.2.2 The SShDPA shall map directly the
TDSAI facility in the connection confirm SNPDU to the same
facility in the call connected packet.
4.7.3.16.6.3 Ground-originated connection
establishment
4.7.3.16.6.3.1 The SSNDPA shall map directly the
TDSAI facility in the connection request SNPDU to the same
facility in the incoming call packet.
4.7.3.16.6.3.2 If the SSNDPG receives a connection
confirm SNPDU from the SSNDPA in response to a connection
request SNPDU with TDSAI facility, it shall forward the
same facility in the call connected packet to the IWF.
b) a connection request with no restriction on response
SNPDU without the fast select (use not permitted)
facility shall be mapped into an incoming call packet
with the fast select facility with the "no restriction on
response" parameter;
c) a connection request with restriction on response
SNPDU without the fast select (use not permitted)
facility shall be mapped into an incoming call packet
with the fast select facility with the "restriction on
response" parameter.
4.7.3.16.8 EXPED~EDDAT A NEGOTIATION
If the expedited data negotiation facility is not present in the
connection request or connection confirm SNPDU, this facility
with its parameter set to 'hse of expedited data" shall be
added to the corresponding incoming call or call connected
packet; otherwise, this facility shall be mapped to the
corresponding packet.
4.7.3.16.9 CAUSE AND DIAGNOSTIC CODES
Clearing cause, resetting cause and diagnostic code fields shall
be transferred without mdfication from the SNPDUs to the
corresponding packets.
4.7.3.16.10 DATA
4.7.3.16.10.1. If the user data field in the data $NPDUs
of an M-bit SNPDU sequence is less than the default data
packet maximum user data field length, then these fields shall
be concatenated to form an M-bit packet sequence.
4.7.3.16.10.2 Lf the user data field in the data SNPDUs
of an M-bit SNPDU sequence is greater than the default data
packet maximum user data field length, then these fields shall
be segmented to form an M-bit packet sequence.
The SSNDPA shall support at least eight simultaneous,
independent logical channels.
4.7.4 I S 0 8208 DCE
protocol operations
The fast select facility shall be treated as follows:
4.7.4.1 GENERALP ROVISIONS
a) a connection request with no restriction on response
SNPDU with the fast select (use not permitted) facility
shall be mapped into an incoming call packet without
the fast select facility;
4.7.4.1 .l The protocol between the IS0 8208 DCE and
the IS0 8208 DTE shall comply with the IS0 8208 second
edition.
Annex 10 - Aeronautical Telecommunications Volume III
Note.- Within the IS0 8208 DCE th~rme ay be more than
one DCE/DTE interface, e.g. a GES may be connected to
more than one ground ATN router: One such entity exists in
the DCE for each DCEIDTE interface. Deciding which entity
to use to reach a particular destination is a function
pegonned external to the protocol described here. The
protocol defned in 4.7.4 pertains to each packet layer entity
in the DCE.
4.7.4.2.1 SUPPORTESDE RVlCES AND CAPABILITIES
The following services and capabilities shall be supported:
a) virtual call service;
b) a user data field of up to 128 octets in data packets;
and
c) expedited data delivery, i.e. the use of interrupt
packets with a user data field of up to 32 octets.
The following facilities shall be supported:
a) calling address extension and called address extension;
and
b) priority.
Note.- The target and lowest acceptable values for the
priority to gain a connection and keep-a connection, and the
lowest acceptable value for data on a connection, need not be
supported.
Recommendation.- The following facilities should be
supported:
a) throughput class negotiation;
b) transit delay selection and indication;
c) fast select;
d) fast select acceptance.
occurrence ofcertuirz IS0 8208 DCE events are to be reported
appropriately. These external interactions include:
　
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