Operation
5
Operation
Handset/ Line In Button
The Handset / Line In button selects
which signal will be sent down the
phone line; the handset microphone,
or the line input jack.
Position: Out
Use the handset to speak and listen
as you normally would. The sound
that you hear on the handset is always
available on the From Phone output
jack.
Position: In
The handset mic is disconnected and
the line input is connected to send
audio signals down the line.
You can also use the Handset / Line
In button to turn off the handset mic
if you are listening to the line output
signal over a loudspeaker. This
will prevent feedback between the
handset microphone and loudspeaker.
In any case you can always listen over
the handset receiver.
We designed this interface to work
with most popular telephone designs.
If a conict arises it will typically be
on the line input side. If you attempt
to send voice band signals down the
line input jack and the distant party
complains that the level is too loud
or severely distorted (clipping), try
to lower the transmit signal on your
audio equipment. If this does not help,
discontinue use immediately.
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