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or by passing the DTE address(es) directly from the AES to the
routing function.
4.7.6.1.3.2 (Reserved)
4.7.6.1.3.3 (Reserved)
4.7.6.2 GES MANAGEMENT INTERFACE
4.7.5.5 DATA TRANSFER PROCEDURES
4.7.5.5.1 FLOW CONTROL
Flow control shall be applied between the SSNDPX and the
IS0 8208 DCE to prevent storage ovefflow.
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 "local link
error" in an SNPDU received from, the SSNDPX by the cause
"network congestion" before forwarding them to the DCE. All
other causes shall be transferred 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 INTERFACE
4.7.6.1.1 The changes in log-on status 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.
4.7.6.1.3.1 The CN function shall be performed by the
CN entity.
4.7.6.1.3.1 bis Join and leave events
The AES shall provide join and leave event messages to the
aircraft routing function to indicate that the air-ground data
link is either available or not available, respectively. The join
and leave messages shall include sufficient information for the
routing function to determine the address(es) of the DTE(s)
a,ttached to the log-on GES.
4.7.6.2.1 The changes in log-on status conveyed from the
GES management to the SSNL shall be as defined in 4.10.3.2.
4.7.6.2.2 When the AES logs off from the GES, the SSNL
shall clear all connections associated with the AES, and shall
release all resources associated with these SNCs. In addition,
the GES shall provide to the attached ATN ground routers a
leave event indication referencing the %-bit ICAO aircraft
identifier.
4.8 CIRCUIT-MODE SERVICES
4.8.1 AMS(R)S circuit-mode
general requirements
Note.- The AMS(R)S ci~uit-mode service is a
communications service between aircraft and ground facilities
using satellite links as one of the connecting media. The
AMS(R)S circuit-mode service provides a means to establish
and maintain a non-shared switched circuit between aircraft
and ground users on demand The primaty purpose of the
circuit-mode service is to provide for safety voice
communications. A switched circuit is held for the duration of
the call unless automatically pre-empted in order to reassign
resources for a higher priority call attempt. AMS(R)S switched
circuits may be interconnected with one or more terrestrial
communications facilities in tandem with the AMS(R)S
subnetwork. These facilities may include safety circuitswitched
networks or dedicated circuits.
4.8.1.1 AMS(R)S circuit-mode services. Circuit-mode
AMS(R)S communjcations services shall be provided to
Level 3 and 4 AESs and shall consist of distress, urgency,
flight safety and other messages related to meteorology and
flight regularity.
Note.- Nun-AMS(R)S circuit switched voice and data
service .for non-safety communications m y be supported by
AMS(R)S on a not-to-intelfere basis provided that the
provisions of 4.8.3.2 are complied with.
4.8.1.2 Order of importance. AMS(R)S services for ATS
communications shall have precedence over non-AMS(R)S
communications.
2/1l/Oo
No. 75
Annex I0 - Aeronautical Telecommunications Volume ZZZ
4.8.1.3 Non-AMS(R)S communications. Non-AMS(R)S
communications shall not interfere with AMS(R)S
communications.
4.8.2 Circuit-mode system
architecture
4.8.2.1 AES circuit-mode services shall be able to specify
a pariicular GES to be used in air-origination calls and shall
not be restricted to its log-on GES. Conversely, a ground
originated call arriving from the terrestrial network of any
GES which has current log-on information of the AES shall be
completed by that GES rather than the GES to which the AES
is logged on.
4.8.2.2 Circuit-mode link layer signalling intelface. The
AES and GES circuit-mode service procedures shall use the
AMS(R)S link layer to exchange signalling information. This
information shall be conveyed in circuit-mode - link interface
data units (CM-LJDU). As a link service user, the AMS(R)S
circuit-mode procedures shall me the services of the link layer
interface defined in 4.5 and 4.6. Each CM-LIDU shall be
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