off hook by detecting changes in the T/R voltage.
Circuit Operation:
Parallel connection detection when on hook:
When on hook Q7 is ON, the voltage is monitored DCIN of DSP. There is no parallel connection if
the voltage is 1.65 V or higher, while a parallel connection is deemed to exist if the voltage is
lower.
Parallel connection detection when off hook:
When off hook Q7 is OFF, the voltage is monitored DCIN of DSP; the presence/absence of a
parallel connection is determined when the voltage changes by 0.2 V or more.
13.9. Signal Route
Each signal route is as follows.
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