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GCA70250
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).
Note: The 8412F-** speakerphone can function in the full-duplex
or half-duplex mode. Both sets of guidelines are applicable to the
8412F-**. the 8412S-**, however, can only function in half-
duplex mode.
Full-Duplex Speakerphone Character-
istics
The Impact SCS 8412F-**-** 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
8412F-** will operate in either full-duplex or half-duplex mode
depending on the current line conditions. For example, satellite calls
or calls with a delay involved may prevent the telephone from oper-
ating in full-duplex mode.
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.
June, 03
Comdial
Attendant Manaul
117
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