Users Manual

ALL
EFFECTIVITY
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Page 5-33
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(c) Where the values provide monotonic gain control with a nominal step size of 3
dB.
NOTE: Thus, when the audio output is adjusted the sidetone level adjusts
with it.
B. 4-wire Call States and Annunciation
(1) The ACD tracks the following call control states per 4-wire channel:
(a) NOT CONNECTED: 4-wire interface is not wired
(b) NOT READY: SDU is not yet logged on, including when a fault prevents it from
logging on
(c) AVAILABLE: SDU is logged on and has an available channel ready for use
(d) CALL INIT: Call has been initiated, CCI:Make Call has been sent to call control
(e) RINGING: Call has been connected at the ground
(f) CONNECTED: Call has been answered at the ground
(g) INCOMING: Call is being announced at the SDU, but is unanswered.
(2) The following ARINC 741 options are not described in ARINC 781 and are not within
scope:
(a) Multi-stroke chime
(b) Go Ahead Chime Reset (only applicable to multi-stroke chime)
(c) Flashing lights
(d) Call via ACP to a number stored in ATC call register
(e) Generation of speech messages.
(3) The ACD connects the 4-wire Audio path for the speakers for calls:
(a) From when the call is connected
(b) Until the call is terminated
NOTE: This applies to Air-to-Ground and Ground-to-Air Calls.
(4) The ACD provides a ringback tone on the initiating interface when an Air-to-Ground call is
ringing.
(5) The following figure shows the call control and annunciation states for the 4-wire
interfaces:
DRAFT
3rd rvw Draft as of:
29 January, 2020