Appendix D Speakerphone Characteristics; Full-Duplex Speakerphone Characteristics - Comdial DSU II SCS84125J Station User's Manual

DSUII LCD Speakrphone User's Guide
APPENDIX D 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 Character-
istics
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 recommends 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 oper-
ating in half-duplex mode.
Depending on the telephone line conditions and the type of speaker-
phone 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.
August, 03 Comdial 109