Introducing The Large Screen Speakerphone | GCA70–349 |
Depending on telephone line conditions and the type of speakerphone the distant party is using, it may not be possible for the 8412F speakerphone to operate in full-duplex mode. If the distant party’s speakerphone is a half-duplex model and both you and the distant party are in speakerphone mode, the half-duplex speakerphone controls the communications mode and prevents the 8412F from operating in full-duplex mode.
To maximize the usefullness of your full-duplex speakerphone, take note of these following observations about full-duplex speakerphone operation.
•The full duplex operating mode requires a small amount of time to adapt to changes in echo; therefore, you should avoid making any movements in the vicinity—about a one-foot radius—of the speakerphone.
•There are certain echo limits beyond which the speakerphone cannot effect canceling. These limits are as follows: room echoes beyond 39 milliseconds (standard configuration) and line echoes beyond 24 milliseconds (standard configuration).
•The speakerphone may automatically reduce the volume in each direction when both you and the distant party talk at the same time (double-talk). This volume reduction is necessary to control the echoes at high volume levels. It is possible for surrounding conversations and other sounds to trigger double-talk even when you are not speaking. This condition may lower the loudspeaker volume at your speakerphone.
•You must adjust the loudness of your voice to match that of the distant party’s voice. This action is necessary to cause full-duplex operation to take place. Sustained doulbe-talk or excessive echo may cause the speakerphone to drop back into half-duplex operation. This happens because the speakerphone’s echo cancel circuits cannot adapt during the double-talk situation.
•If both you and the distant party are using full-duplex speakerphones, the sensitivity to both echo path changes and volume reduction during double-talk is doubled from the sensitivity when just one full-duplex speakerphone is involved.
1 – 4 Large Screen Speakerphone Manual
