MIX Modem - GSM
User Manual V.1.1
Pag. 18
Subject to change without prior notice
Audio Parameters Adjustable by AT Commands
Parameter
Influence to
Range
Gain
range
Calculation
inBbcGain
MICP/MICN analog amplifier
gain of baseband controller
before ADC
0...7
0...42dB
6dB steps
inCalibrate
digital attenuation of input
signal after ADC
0...32767 -∞...0dB
20
*
log
(inCalibrate/
32768)
outBbcGain
EPP/EPN analog output gain of
baseband controller after DAC
0...3
0...-18dB
6dB steps
outCalibrate[n]
n = 0...4
Digital attenuation of output
signal after speech decoder,
before summation of sidetone
and DAC present for each
volume step[n]
0...32767 -∞...+6dB
20 * log (2 *
outCalibrate[n]/
32768)
sideTone
Digital attenuation of sidetone is
corrected
internally
by
outBbcGain to obtain a constant
sidetone
independently
to
output volume
0...32767 -∞...0dB
20
*
log
(sideTone/
32768)
3.3 Mini USB Connector
TC65 supports a USB 2.0 Full Speed (12Mbit/s) device interface. The USB interface is primarily
intended for use as command and data interface and for downloading firmware. The USB I/O pins are
capable of driving the signal at min 3.0V. They are 5V I/O compliant.
The USB port has different functions depending on whether or not Java is running. Under Java, the
lines may be used for debugging purposes (see [16] for further detail). If Java is not used, the USB
interface is available as a command and data interface and for downloading firmware.
The USB I/O-pins are capable of driving the signal at min 3.0V. They are 5V I/O compliant. To properly
connect the module’s USB interface to the host a USB 2.0 compatible connector is required.
Furthermore, the USB modem driver delivered with MIX MODEM GSM must be installed as described
below.
The USB host is responsible for supplying, across the VUSB_IN line, power to the module’s USB
interface, and all the other MTX-65i interfaces. This is because MTX-65i is designed as a self powered
device compliant with the “Universal Serial Bus Specification Revision 2.0”
