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4.8.2.3 OTHER AES CIRCUIT-MODE
SYSTEM INTERFACES
4.8.2.3.1 AES management interfnce. The specific information
exchanged between AES circuit-mode services and
AES management shall be as defined in 4.9.
4.8.2.3.2 AES voice codec externul interface. The AES
extemal voice interface shall convey bi-directional voice
information in a form compatible with aircraft-specific audio
systems.
4.8.2.4 OTHER GES CIRCUIT-MODE
SYSTEM INTERFACES
4.8.2.4.1 GES management inter$ace. The specific
information exchanged between GES circuit-mode services and
GES management shall be as defined in 4.10.
4.8.2.4.2 Voice codec external interface. The GES
extemal voice interface shall convey bi-directional voice
information in a form compatible 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 GES 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 Prioriv and pre-emption. AMS(R)S calls shall
havepriority over all non-AMS(R)S calls and shall be capable
of pre-empting non-AMS(R)S caIls 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 senice
priority than an AMS(R)S call in progress shall be able to
preempt the lower service priority call if necessaq 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-of-service. 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 rnore 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.- Cuidunce material on access delay performance
requirements for the AMS(R)S subnetwork and how they
impact planning of ATS terrestrial networks is contain.ed in
Attachment A to Pan I.
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 anival of all AES call
information at the GES link layer shall be 1.0 second (95th
percentile).
Note.- All AES call information is contained wifhin the
"abbreviated access request" CM-LIDU received via the R
channel.
4.8.4.1.1.2 GES C channel assignment delay. The
maximum time delay for a GES to enqueue a "C channel
assignment" CM-LIDU for service by the P channel link layer
after an "abbreviated access request" CM-LIDU has anived at
the GES link layer shall be 1.5 seconds (95th percentile).
4.8.4.1.1.3 AES C channel assignment response delay.
The maximum time delay for an AES to begin transmitting a
C channel carrier after a "C channel assignment" CM-LIDU
has arrived at the AES link layer shall be 1.0 second (95th
percentile).
4.8.4.1.2.1 GES C channel assignment de fay. The
maximum time delay for a GES to enqueue a "C channel
assignment" CM-LIDU for service by the P channel link layer
after a call origination event (FITE 18, see Table 4-41) has
arrived at the terrestrial network interworking interface shall
be I .5 seconds (95th percentile).
4.8.4.1.2.2 AES C channel assignment response delay.
The maximum time delay for an AES to begin transmitting a
C channel carrier after both a "call announcement" CM-LIDU
and a "C channel assignment" CM-LIDU hive arrived at the
AES link layer shall be 1.0 second (95th percentile).
Part I Annex 10 - Aeronautical T Q E ~ c o ~ ~ u ~ ~ c u ~ Note.- The AES procedures for ground-originated calls
require an AES to await the succes~ful receipt of both CMLIDUs
before C channel transmission can begin. These procedures
include error-recovery' logic to handle their potential
receipt out of normal order:
4.8.4.2 TRANSFERD ELAY
The total allowable transfer delay within the AMS(R)S
subnetwork on a C channel operating at 21.0 kbits/s shall be
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