Users Manual

ALL

EFFECTIVITY

Page 5-10

22 Apr 2019

23-15-49

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL

ASPIRE-400

(2) The implementation of safety voice has been aligned as much as possible to the classic

safety voice model and supports the same number of priority levels. The following

guidance is provided in DO-262 as to the intended use for the priority levels:

(a) Distress 1 (High)

(b) Air Traffic Service 2

(d) Airline Admin Control 4

(e) Passenger Communications 5 (Low).

(3) The network algorithm for allocating the CS voice channel and the VOIP voice channel to

the two highest priority calls is based on preferring the CS service when possible.

(4) The ACD PBX supports up to two simultaneous Priority service voice calls on the

following ORT enabled User interfaces:

(a) 4-wire1

(b) 4-wire2.

(5) Using the following INMARSAT Safety SBB services:

(a) One over circuit switch using a AMBE +2 vocoder;

(b) One over multi-voice VOIP using a G729A vocoder.

(6) Any PS or CS Ground-to-Air Call with priority other than public is routed to the 4-wire

interfaces.

(7) Initiation or termination of a call on any of the satellite facing or aircraft facing interfaces

does not impair a pre-existing call that is not terminated.

(8) When the channel card indicates the safety voice AES activation is not "logged on" for

reasons other than the SATCOM system equipment failures, the ACD configures ARINC

label 270 (SDU to MU/CMU) to the following:

(a) Set bit 13 to "1"

ELSE

(b) Set bit 13 to "0"

5. AISD / PIESD Processor (APP)

A. APP Boot

(1) The APP stage1 (mini) boot code activates:

(a) The primary stage2 boot image

(b) The secondary stage2 boot image if the primary stage2 boot image is non-

functional.

B. APP Control

(1) The AP processor provides both the AIS and the PIES domains. Each domain operates

independent of the other, but only the AISD is classed as a trusted domain in the APP

since it does not interact with the cabin. The AISD is tasked with performing all APP

configuration based on information from the ACD, including any configuration associated

DRAFT

3rd rvw Draft as of:

29 January, 2020