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Version 0.1
Operating manual
Energy received by user line during incoming call is supplied to SUIC
and
CUESU, and then actuates incoming call signaling; at the same time, it is supplied to
USU and switches on light signaling of user line.
Once user line toggle switch is actuated on USU, energy from user line is supplied
to inputs VC1 and VC2; then power is supplied to AP and ES. AP and SC ensure trans-
mission of voice signals to user and back after pressing a PTT switch on the correspond-
ing communication device.