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comprised of specific link interface control information (LICI)
parameters required by the link layer service. The CM-LZDUs
and their relevant ETCI parameters are defined in Table 4-38.
4.8.2.3 CIRCUIT-MOTDEEL EPHONY
IMERWORKING INTERFACE
Note.- Guidance material on the circuit-mode telephony
interworking inrefldce is contained in Attachment A to Part I.
4.8.2.3.1 The AES and CES circuit-mode service
procedures shall interwork with external telcphony networks
through an interworking interface comprising a standardized
set of intenvorking telephony events which conform to ITU
CCI'IT Recommendations Q.1501 to Q.608. The set of
intenvorking telephony events used by the circuit-mode
procedures, and the requirements for mapping parameters
between the events and corresponding CM-LLDUs, shall be as
defined in Tables 4-39 to 4-42.
Note.- Details of ITU CCITT Recommendations Q.601 to
8.608 are contained in CCITT Blue Book, Volume VI -
Fascicle VI.6.
4.8.2.4 OTHER M S CIRCUIT-MODE
SYSTEM INTERFACES
4.8.2.4.1 AES management inte@we. The specific
information exchanged between AES circuit-mode services
and AES management shall be as defined in 4.9.
2J11IOO
4.8.2.4.2 AES voice codec external interface. The AES
external voice interface shall convey bi-directional voice
information in a form compatible with aircraft-specific audio
systems.
4.8.2.5 OTHER GES CIRCUIT-MODE
SYSTEM INTERFACES
4.8.2.5.1 GES management irttegace. The specific
information exchanged between GES circuit-mode services
and GES management shall be as defined in 4.10.
4.8.2.5.2 Voice codec external intelface. The GES
external voice interface shall convey bi-directional voice
information in a form conipatible with terrestrial network
audio channels.
4.8.3 AMS(R)S service requirements
4.8.3.1 Connectivity. The AMS(R)S service shall support
the on-demand establishment of switched circuits between any
aircraft within the service area of a EES and the terrestrial
networks serving the GES. The AMS(R)S service shall allow
a circuit switched transaction to be established between an
aircraft and a terrestrial network via a GES other than the GES
to which the aircraft is logged on.
4.8.3.2 Priority and pre-emption. AMS(R)S calls shall
have priority over all non-AMS(R)S calls and shall be capable
of pre-empting non-AMS(R)S calls if required to gain
immediate access to the circuit-mode service. AMS(R)S calls
shall be established and maintained in accordance with the
priority levels defined in Table 4-43. An AMS(R)S call with a
higher service priority than an ARIS(R)S call in progress shall
be able to preempt the lower service priority call if necessary
to gain immediate access to circuit-mode service. All
AMS(R)S call attempts crossing the interface between a GES
and a terrestrial network shall be identified as to the associated
priority category.
4.8.3.3 Grade-ofservice. The GES shall have available
sufficient C channel resources such that an air or groundoriginated
call attempt received at the GES shall experience a
probability of blockage within the GES of no more than 0.01.
Available GES C channel resources shall include all preemptable
resources (e.g. those in use by non-safety users).
4.8.4 AMS(R)S performance requirements
4.8.4.1 CALL PROCESSING DELAYS
Note I.- Guidmce materiul on access delay pe~ormance
requirements for the AMS(R)S subnetwork and how they
impact planning of ATS terrestrial networks is contained in
Attachment A to Part I.
Part I Annex 10 - Aeronautical Telecommunications
Note 2.- Figure A5-la) shows the "access request" 4.8.4.2.2 The maximum transfer delay component that
CM-LIDU which is associated witlt one of fhe two direrent can be attributed to the AES or GES shall be 0.080 second for
access request SUs shown in Figures A2-45 and A2-46. The each.
jirst is the baseline standard, with the second providing
slightly less connection establishment delay. Note 1.- Fixed transfer delay components of 0.285 second
and 0.040 second am allotted to RF propagation delay (worst
4.8.4.1.1.1 GES signalling transit delay. The maximum
time delay for a GES to present a call origination event
(FITE 18, see Table 4-42) to the terrestrial network interworking
interface after the first arrival of all AES call information
at the GES link layer shall be 1.0 second (95th percentile).
Note.- AES call information is contained within the
"access request" CM-LIDU received via the R channel and in
the CM-LIDU received via the C channel. Figures A2-45 and
A2-46 show two access request SUs.
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