Northern Airborne Technology PIA01-001 - Manual (Page 14)

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-5
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.2 Interconnect Audio
2.4.4.2.1 Microphone Inputs
The PIA01 has six Microphone Inputs. Each Microphone Input has independent VOX operation, an
independent user ICS Key input, and can support one or two microphones connected in parallel. With two
microphones connected operation may be degraded; TSO minimum performance standard operation has
only been demonstrated with one microphone connected to each Microphone Input.
2.4.4.2.2 Headphone Outputs
The PIA01 has six mono Headphone Outputs. Each Headphone Output can support one or two
headphones connected in parallel. With two headphones connected operation may be degraded; TSO
minimum performance standard operation has only been demonstrated with one headphone connected to
each Headphone Output.
2.4.4.2.3 Stereo Music Input
The PIA01 has one Stereo Music Input. The MUSIC L and MUSIC R inputs are summed together inside the
PIA01 to provide a monaural music audio to all headphone outputs. The music is not included in the audio
signal on the ICS Tieline. The music is muted to the headphones whenever a user is talking on the intercom.
2.4.4.2.4 ICS Tieline
The PIA01 can support ICS communications with an external device on either an analog or a digital
tieline, but not both.
2.4.4.2.4.1 ICS Mode
The PIA01 operates in either Digital mode or Analog mode depending on the availability of ICS Tieline
signals. On power-up the PIA01 will default to analog mode operation, but continuously looks for a signal
on the digital ICS tieline input. If the PIA01 detects a valid signal on the digital ICS tieline input it will enter
digital mode; if the PIA01 loses the signal on the digital ICS tieline it will remain in digital mode using the
configuration settings last received from the digital ICS tieline.
Note: The digital and analog modes only describe the ICS tieline interface. Internally the unit processes
audio digitally in both modes.
2.4.4.2.4.2 Analog ICS Tieline
The Analog ICS Tieline can be configured to support standard NAT analog audio products. Refer to the
interconnect drawing in section 2.7 to ensure that the tieline loading is correct.
The Analog ICS Tieline is disabled when the PIA01 is operating in digital mode.
2.4.4.2.4.3 Digital ICS Tieline
The Digital ICS Tieline allows connection of the PIA01 to one external device. The PIA01 sends digital
audio to the external device, and receives digital audio and configuration data from the external device.