Bose T5 Service Manual - Page 10
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Operation Modes (Audio Management) Dual Comm Versions (continued):
Port 2 is intended to be a secondary communications port. The presentation of this source's
audio to the headset depends upon the presence of a cable plugged into Port 1.
If Port 1 has a cable plugged in, the audio from the Port 2 device will only be presented to the
left earcup. In order to properly mix the audio between the multiple sources while maintaining
the dynamic range of the headset, the two signals will each be reduced by 6dB. The reduction
will occur as soon as the second cable is attached to the port on the bottom of the control
module .
If Port 1 does not have a cable plugged in, the audio from the Port 2 device will be presented to
both earcups and will not be reduced by 6dB.
Binaural devices may be connected to Port 2, however the cable connecting this type of source
to the control module will mix the two separate channels onto one signal line and present the
device as a mono device to the headset. Whenever Port 2 has a cable connected to it, pressing
PTT 2 shorts the control line to ground of the Port 2 source which enables transmission of the
boom microphone signal to the Port 2 source. If there is no cable connected to Port 2, nothing
happens when PTT 2 is pressed. The "Mic live" switch has no effect on any Port 2 device under
any configuration.
The table below describes how the headset manages the multiple audio sources based on what
cables are connected as well as how the PTT buttons function. An N/A in a cell means there is
no cable connected or there is no function. There are many variations of this that are possible.
Mode of operation
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PRODUCT DESCRIPTION
Port 1
X
N/A
X
X
N/A
X
X
X
10
Port 2
Left Earcup
N/A
Port 1
X
Port 2
X
Port 1 + Port 2
N/A
Port 1
X
Port 2
X
Port 1
N/A
Port 1
X
Port 1 + Port 2
Right Earcup
Port 1
Port 2
Port 1 + Port 2
Port 1
Port 2
Port 2
Port 1
Port 1