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Unpowered or Low Power
Low Power or Intercom
Framingham, MA 01701-9168
Voltage Range
The headset shall operate in one of three different modes as a function of the
applied voltage. The operating modes shall be identified as "Unpowered", "Low
Power" and "Intercom", and each mode shall be active with the voltage applied at
the power contacts of the vehicle interface connector.
Operating Mode
Unpowered
Low Power
Intercom
Over Voltage
The headset shall survive and operate without malfunction when a pulse of
duration 100µs and potential 36V above ground is applied to the power line. The
pulse repetition rate shall not exceed 1 pulse every 10ms.
Ripple and noise
The headset shall operate through and reject power supply ripple up to 2.7V
peak to peak from 300 Hz to 4500 Hz. During exposure to ripple, the headset
shall not product any noise greater than 65 dB SPL.
Intercom Mode Operation (Standard Operating Mode)
When operating at Intercom Mode the headset shall have the following current
draw characteristics under any condition, except during turn-on:
TTH
At least 40ma but less
than 220 mA peak
In Intercom Mode, the headset shall have the following functional characteristics:
Functional
Characteristics
Active ANR
Selectable Talk-through
Powered Output Level
Powered Frequency
Response
Active microphone
preamplifier output
SIZE
FSCM
A
32108
Voltage Range
TTH
0.0 – 5.8 VDC
5.8 – 6.1 VDC
6.1 – 11.0 VDC
11.0 – 13.5 VDC
13.5 – 32.0 VDC
Current Draw
TTH Series 2
Less than 38mA
peak
TTH
CLASS
DWG NO.
RF
TTH Series 2
0.0 – 13.5V
--
--
--
13.5 – 32.0 VDC
TTH
Series 2
Not
Applicable
SHEET
273139
21 of 25
REV.
01D
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