7
4.2
Audio connection
Audio is passed between phone cradle and phone using the digital audio connection in the base of the phone.
The headset audio jack on the side of the phone is NOT used.
4.2.1
Connection to the audio panel using a Flightcell DZM
If the cradle is used to connect an Iridium 9555 handset to a Flightcell DZM, refer to the installation manual
and interconnect drawings for the applicable model of DZM. These documents are supplied with the DZM or
can be downloaded from the Flightcell support page at
http://www.flightcell.com/support.aspx
.
4.2.2
Connection to the audio panel without using a Flightcell DZM
The cradle is primarily designed to be used in conjunction with a Flightcell DZM. If it is to be connected to the
audio panel without a DZM, two methods can be used:
4.2.2.1
Connection to a cellphone port on an audio panel
If the aircraft audio system has a cellphone port, the cradle audio input and output can be connected to the
audio panel output and input, respectively. Refer to the audio panel’s installation manual for details.
4.2.2.2
Connection using a Flightcell VAM
Otherwise to connect the cradle to an audio panel or ICS, it is necessary to use an additional module to adjust
input and output levels to and from the cradle to match the appropriate levels on the audio panel/ICS.
The Flightcell VAM (Versatile Audio Module) provides a means of connecting the cradle to an audio panel. The
function of the VAM is to
Match impedance and voltage levels for the cradle to those on the audio panel
Provide microphone bias voltage (which is typically required when connecting to a high-impedance
headset)
Provide galvanic isolation between input and output
Provide sidetone.
Instructions on VAM installation and configuration are provided in the installation manual
(MAN_VAM_ENGALL_OperatingManual_1.2) available on the Flightcell support page
http://www.flightcell.com/support.aspx
.
4.3
Data connection
The main connector on the phone cradle is wired for an RS232 serial data connection. This is converted in the
cradle to USB for the phone’s USB connection.
If a USB connection to the phone is required, an alternative model of cradle with direct USB connection is
available. Contact Flightcell International for further information.
