User's Manual

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion® HSD-440 Mark 2 Terminal
23-15-30 2-24
3 JUN 10
F. Performing Cockpit Communications with the MCDU
This section provides instructions for making calls with the MCDU and 4-wire voice
services available in the aircraft’s cockpit. The cockpit communications system operates
with one or two headsets in the aircraft’s cockpit, depending on the operational mode.
(1) Modes of Operation
The cockpit communication services are configured in one of two modes of operation
before installation: Latched mode and Push-to-Talk (PTT) mode. These
configurations are strapped at the terminal and cannot be changed without removing
and rewiring the terminal.
In PTT mode, a telephone number can be dialed only using the MCDU keys, not with
the switches on the cockpit communication console. In Latched mode, a call to a
telephone number loaded into the MCDU can be initiated using the switches on the
Audio Control Panel (ACP), and calls can be answered and ended with the switches
or the MCDU buttons.
(2) Accepting and Making Calls
You can accept and make voice calls using
• the HSD-440 Mark 2 Terminal, the MCDU, the ACP, and one or two 4-wire cockpit
headsets
or
• the HSD-440 Mark 2 Terminal, the WSC, the ACP, and one or two 4-wire cockpit
headsets.
(a) Automatic Call Handling Priority and Preemption
The HSD-440 Mark 2 Terminal automatically disconnects (preempts) a call if it
receives a higher priority call when both classic Aero channels are in use. When
two calls are in progress, the HSD-440 Mark 2 Terminal preempts the lower
priority call. If both calls are the same priority, the HSD-440 Mark 2 Terminal
preempts the last call received.
When the HSD-440 Mark 2 Terminal preempts the lower priority call and
connects the higher priority call, the caller in the aircraft does not receive a notice.
The new, high priority call starts as soon as the HSD-440receives it.
(b) Accepting and Making Calls
You can use the MCDU and ACP to accept calls, make air-to-ground calls, and
make air-to-air calls. You can manually dial calls or dial previously saved
telephone numbers from the MCDU’s telephone directory.
The way in which you can accept or make calls depends on the mode in which
your 4-wire cockpit headset is strapped (PTT mode or Latched mode) and the
Cockpit Outgoing Call Pre-Select ORT parameter. Refer to
"Configuring
Outgoing Call Pre-Selection" on page 6-24.
The combination of lights and chimes that alert you to an incoming call depends
on the way in which the HSD-440 Mark 2 Terminal Cockpit Call Signalling Mode
ORT parameter is set. Refer to
C. “Configuring Cockpit Communication
Parameters” on page 6-5. If you use the alternate output discretes, the call
discrete outputs are driven as per Table 2-4 instead of using lights and chimes.