Vertical Communications 8012S - Manual (Page 141)

iPrimo Speakerphone Station User’s Guide
October, 02 Comdial 131
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 gen-
erates a ringing sound (public address systems do this if the volume is
too high or the microphone is too close to a loudspeaker).
The 8900-IP speakerphone can function in a full-duplex or half-
duplex mode.
Full-Duplex Speakerphone Guidelines
The 8900-IP speakerphone uses the latest full-duplex speakerphone
technology. (Full-duplex technology enables both parties on a speak-
erphone call to speak simultaneously—half-duplex speakerphones
carry only one person’s voice at a time.) and will operate in either
full-duplex or half-duplex mode depending on the current line condi-
tions. For example, satellite calls or calls with a delay involved may
prevent the telephone from operating in full-duplex mode.
To operate in full-duplex mode, the telephone must perform a “speech
training” test at the beginning of each call. To achieve optimum per-
formance 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 operating 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 to operate in full-duplex
mode. If the speakerphone at the other end is a half-duplex speaker-
phone and both parties are in speakerphone mode, the half-duplex
speakerphone is the controlling factor preventing full-duplex mode.