ALL
EFFECTIVITY
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Page 2-31
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(b)
And the ORT indicates standard call discretes, the ACD asserts in SDU to CMU
label 270:
1
Bit 26 if the call is on 4wire 1
2
Bit 27 if the call is on 4wire 2.
(4)
Whenever a 4-wire call is released by either:
(a)
The ground side OR
(b)
The air side, the ACD:
1
De-asserts the associated call light discrete for the channel if the ORT
indicates standard call discretes
2
De-asserts the associated SATCOM Voice Communications bit (bit 26
for channel 1, bit 27 for channel 2) in SDU to CMU Label 270.
D.
4-Wire Call Control
(1)
Call control inputs are used to place, accept and end calls and to key the Air-to-Ground
audio connection. The SDU accepts control inputs from:
(a)
Cockpit Voice Mic On Discrete
(b)
Call Place/End discrete
(c)
Call-display-and-control protocol (e.g. via MCDU).
(2)
The SDU supports two modes of call control:
(a)
Latched: Bidirectional audio path is present while the call is connected
(b)
Push-to-talk call: Air-to-Ground audio only present when call is connected and
the Mic is activated.
E.
Ground-to-Air Call Decision
NOTE:
This figure is descriptive to aid understanding, explicit requirements cover the content.
(1)
The ACD routes, rejects, or re-directs to PS the Ground-to-Air CS safety voice calls
according to the call decision logic defined by:
(a)
BGAN CS routing and preemption
(b)
Voice ORT configuration.
(2)
The ACD PBX retrieves priority in Ground-to-Air CS calls from:
(a)
the eMLPP priority value in the incoming circuit switch message (Report Status)
from CC if present else,
(b)
set the call priority as Public.
(3)
The following figure describes the incoming call decision logic for the PS channel:
DRAFT
3rd rvw Draft as of:
29 January, 2020
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