After Sales
Technical Documentation
Handset HSU–1
Page – 5
Original 50/96
External Signals and Connections
The HSU–1 Audio Handset has an 8 pin modular connector at the end of
the coil cord to the junction box. There are only five lines in use in the coil
cord.
External Connections
Functional Description
Main function of The HSU–1 Audio Handset is to form an electroacoustic
interface between the user and the phone environment. The HSU–1 Au-
dio Handset consists of handset with coil cord and of cradle. In the hand-
set there is earphone and microphone with corresponding ampli-
fiers.There is also a simply interface for controlling these functions. Elec-
tronics consist of DG1 handset module. Mechanical dimensions are small
and mechanics consists of A–cover, B–cover and coil cord with the
cradle. The HSU–1 Audio Handset has a volume potentiometer.
Circuit Description
HSU–1 Audio Handset consists of the following functional blocks:
– Earphone amplifier
– Microphone amplifier
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