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shall contain the facility parameter field.
4.7.3.10.1 3.3 Recommended facilities
Recommendation.- The following facilities should be
supported by the SSNDPX;
The expedited data negotiation facility format shall be as
defined in Figure 4-28.
4.7.3.10.14 DIAGNOSTICCO DES
When connection releasetreset is initiated by the SSNDPX, the
coding of the diagnostic code field in the connection released
and reset SNPDUs shall be as defined in Table 4-17.
4.7.3.1 1 TIMER VALUES
The timer values shall be as defined in Table 4-20.
4.7.3.12 STATE DIAGRAMS
State diagrams for the following states shall be given below:
a) The state diagram for connection establishmenthelease
of a logical channel shall be as defined in Figure 4-29.
b) The state diagram for reset and flow control states
within the data transfer state shall be as defined in
Figure 4-30.
4.7.3.13 STATE TABLES
4.7.3.13.1 Action taken in any state of the SSNDPX
shall be given by Tables 4-21 to 4-24.
4.7.3.13.2 The following conventions shall be used in
the state tables:
Part 1 Annex 10 - Aeronautical Telecommunications
a) action taken, which could be:
- normal, as defined in 4.7.3.5 to 4.7.3.8;
- discard the received SNPDU and take no subsequent
action as a result of receiving that SNPDU;
- error, as defined in the table;
b) D = the diagnostic code contained in the diagnostic
code field of the appropriate SNPDU (connection
released, or reset) issued upon the detection of the
indicated error.
4.7.3.14 SATELLITE SUBNETWORK
DEPENDENT TO LINK LAYER
INTERFACE FUNCTIONS
4.7.3.14.1 The interface functions to the link layer shall
include the following:
a) generation and reception of link interface data units
(LrDUs);
b) routing of received SNF'DUs according to connection;
c) selection of further SNPDUs for transmission according
to a cyclic order of selecting among the logical
channels at a given Q number and giving precedence
to interrupt SNPDUs over data SNPDUs of the same
Q number; and
d) routing of local acknowledgement (success/fail) for
RLS transmission status indication LIDUs.
4.7.3.14.2 The LIDUS passed between the SSNDPX and
the link layer shall include the LIDUs defined in Table 4-25.
4.7.3.15.3.1 The called address extension and the calling
address extension parameter fields in the IS0 8208 call request
packet shall be directly mapped into the called NSAP address
and the calling NSAP address fields in the connection request
SNPDU.
4.7.3.15.3.2 If the called address extension parameter in
either the IS0 8208 call accepted packet or clear request
packet is equal to the called NSAP address of the corresponding
connection request SNPDU, then the called address extension
shall not be transmitted across the satellite link, otherwise,
it shall be directly mapped into the relevant SNPDU.
4.7.3.15.4.1 The target value for the priority of data on
a connection in the IS0 8208 call request packet shall be
mapped to the LDU Q number passed to the link layer as
defined in Table 4-26. This value shall be used as long as the
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 LDU 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
quality of service not available - (permanent conditionj".
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 PACKET TO SNPDU
MAPPING RULES
4.7.3.15.1 The rules for mapping the IS0 8208 packet
fields into the corresponding fields in SNPDU shall be as
specified in this section.
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
4.7.3.15.2 DTE ADDRESSES
4.7.3.15.2.1 The called-DTE address and the calling-
DTE address fields in the IS0 8208 call request packet shall
be directly mapped into the called-DTE address and the
calling-DTE address fields in the connection request SNPDU.
4.7.3.15.2.2 The calling and called DTE addresses in the
IS0 8208 call accepted packet shall not be transmitted across
the satellite link.
　
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