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4.7.6.1.3.1 The CN function shall be performed by the
CN entity.
Part I Annex 10 - Aeronautical Telecommunications
4.7.6.1.3.2 Log-on to a GES
When the AES logs-on to a GES, the AES shall send a join
event message to the attached ATN router on the aircraft. This
message shall include sufficient information for the attached
ATN router to determine the address(es) of the DTE(s)
attached to the GES.
Note.- The attached ATN router: on receiving the join
event message, will have suflcient inforrnution to establish the
S vcs.
4.7.6.1.3.3 Log-oflfrom a GES
When the AES logs-off from a GES, the CN shall forward to
the IWF a leave event message indicating ABS log-off from
the GES.
4.7.6.2 GES MANAGEMENT INTERFACE
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 reiease all resources associated with these SNCs. In
addition, the GES shall provide to the attached ATN ground
routers a leave event indication referencing the 24-bit ICAO
aircraft identifier. r
4.8 ClRCUIT-MODE SERVICES
4.8.1 AMS(R)S circuit-mode
general requirements
Note.- The AMS(R)S circuit-mode service is a communications
service between aircraji and ground facilities using
satellite links as one of the connecting media. The AMS(RjS
circuit-mode service provides a means to establish and maintain
a nun-shared swrtched circuit behieen aircrafr and
ground users on demand. The primary purpose of the circuifrnode
servzce is to provide for safely voice communications. A
switched circuit is held for the duration of the call unless
alttonlatically pre-empted in order to reassign resources for a
higher priorz~c all attempt. AMS(RjS switched circuits may be
interconnected with one or more terrestrial cornrr~un~cations
facilities in tandem with the AMS(R)S subrte~ork. These facilities
m y include safe^ circuit-srvitclted networks or
dedicated circuits.
4.8.1 :I AMS(RjS circuit-mode senlices. Circuit-mode
AMS(R)S communications 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.- Non-AMS(R)S circuit switched voice and data
service for non-safety communications may be supported by
AMS(R)S on a not-to-interfiere 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.
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
AES circuit-mode services shall be abIe to specify a particular
GES to be used in air-origination calls and shall not be
restricted to its log-on GES. Conversely, aground 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.
4.8.2.1 Circuit-mode link layer signalling interface. The
AES and GES circuit-mode senice procedures shall use the
AMS(R)S link layer to exchange signalling information. This
information shall be conveyed in circuit-mode - Iink interface
data units (CM-LIDU). As a link service user, the AMS(R)S
circuit-mode procedures shall use the services of the Iink layer
interface defined in 4.5 and 4.6. Each CM-LIDU shall be
comprised of specific link interface control information (LICL)
parameters required by the link layer service. The Chi-LDUs
and their relevant LICI parameters are defined in Table 4-38.
4.8.2.2 CIRCUIT-MODE TELEPHONY
INTERWORKING INTERFACE
Note.- Guidance material on the circuit-mode telephony
interworking interface is contained in Attachment A to Part I.
4.8.2.1.1 The AES and GES circuit-mode service procedures
shall interwork with external telephony networks through
an interworking interface comprising a standardized set of
interworking telephony events which conform to ITU CCI'IT
Recommendations Q.601 to Q.608. The set of interworking
telephony events used by the circuit-mode procedures, and the
requirements for mapping parameters between the events and
corresponding CM-LIDUs, shall be as defined in Tables 4-39
to 4-42.
Annex 10 - Aeronautical Telecommunications Volume ZZZ
Note.- Details of ITU CCITT Recommendations Q.601 to
8.608 are contained in CCITT Blue Book, Volume VI -
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