Bose T5 Service Manual page 8

The control module switches and buttons are designed to be easily operated while wearing
typical work gloves with a material thickness of up to 3mm. They are also designed to provide
tactile feedback during operation and configured such that the mode of the switch can be
recognized visually or by feel.
The switches and their functions include:
1. Push to Talk (PTT) switch(es) (Momentary-Off)
2. 4-position rotary switch Talk Through (TT) control. The Talk Through circuit can be
powered by either the intercom (if applicable) or the 2-AA batteries in the control module.
3. Battery powered Active Noise Reduction (ANR) Switch (On-Off)
4. ICS Mic live Switch (Live-Mic, Mic-Off) This switch is used to enable continuous active
(latched) PTT mode for Intercom communications.
The boom microphone is serviceable and replaceable in the field. It is a dynamic microphone
which consists of a flexible gooseneck boom and a noise cancelling dynamic microphone
capsule. The Boom Microphone output is specific to the device it is attached to and is achiev-
able by selecting the appropriate cable. Some options may include a pass-through while others
may include a +24dB gain to simulate an electret microphone's output level. If gain is needed,
the power is provided by the input device OR from the control module depending on the specific
input cable. Some options may include a pass-through dynamic 150 ohm, single ended or
differential microphone.
Operation Modes (Power Compatibility)
The power modes listed below are determined by the combination of cables plugged into the
device as well as voltages that are present in different locations or vehicles. Any combination of
power modes based on input connections or signals can be configured within the electronics of
the control module including but not limited to the following scheme.
External Power Source
• Unpowered (0 – 6.0 VDC )
• Battery powered ANR (2-AA batteries)
• Gain switchable Talk Through only
• Selectable Output Level and Frequency Response (Both parameters follow the state
of ANR and/or Talk-Through)
• Boom Microphone Output is specific to device it the is attached to and is configured
inside the input cable. Some options may include a pass through while others may
include a +24dB gain to simulate an electret microphone's output level. If gain is
needed, the power is provided by the input device OR from the control module
depending on the specific input cable.
Low Power (6.1 - 13.5 VDC)
• Battery powered ANR
- ANR Switch position has no effect
• Gain switchable Talk Through
PRODUCT DESCRIPTION
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