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GCA70-377
D
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).
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 speakerphone 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 conditions. 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 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 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 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 full-duplex mode.
IP Speakerphone Station User's Guide
Speakerphone Characteristics
Speakerphone Characteristics
103
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