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Modem
Interface
This equipment modulates digital signals transmitted from the control side into analog signals, and then
transmits them to the mouth side of the handset.
On the other hand,
it
demodulates analog signals received from the ear side of the handset into digital
signals, and then transmits them to the control side.
The configuration can be divided into a speaker output unit, a microphone input unit, and a modem board
unit. Coupling transmission/receiving is made with the speaker output unit attached to the transmission
side of the handset and with the microphone input unit mounted to the receiving side of the handset. The
modem board mounts modulation and demodulation circuits.
Figure 10. Configuration
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