Comdial DSU II Series, User Manual

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Speakerphone
Characteristics
When using your speakerphone, the microphone and loudspeaker are farther away
from you than when you use a handset. Both the signal from the loudspeaker and the
signal to the microphone must be strengthened.
When microphones and loudspeakers are close together (such as in a speakerphone),
additional amplification typically generates a ringing sound (public address systems
do this if the volume is too high or the microphone is too close to a loudspeaker).
Full-Duplex Speakerphone Characteristics
The Impact SCS 8324F-** speakerphone uses the latest full-duplex speakerphone
technology. (Full-duplex technology enables both parties on a speakerphone call to
speak simultaneously—half-duplex speakerphones allow only one person to speak
at a time.) The 8324F-** will operate in either full-duplex or half-duplex mode
depending on the current line conditions.
At the beginning of each call the telephone must perform a “speech training” test. To
achieve optimum performance from the full-duplex speakerphone, Comdial recom-
mends that each user in turn speak about 10 consecutive words to allow the
telephone to “train” itself. Note that during the “speech training” test, the
speakerphone is operating in half-duplex mode.
Depending on the telephone line conditions and the type of speakerphone at the
other end, it may not be possible for the 8324F-** to operate in full-duplex mode. If
the speakerphone at the other end is a half-duplex speakerphone and both parties are
in speakerphone mode, the half-duplex speakerphone is the controlling factor,
preventing the 8324F-** from operating in full-duplex mode.
LCD Speakerphone Station User’s Guide 91
GCA70-281 Speakerphone Characteristics
D