Strata DK Digital Telephone 10/01 117
Full-duplex Speakerphone 4This chapter explains how to use the Full-duplex Digital Speakerphone
(DKT2020-FDSP).
The DKT2020-FDSP is designed to allow both parties of a speakerphone c all to sp eak
simultaneously. This eliminates “clipping” and enables true two-way conversation.
However, when two parties are talking simultaneously, th e performance is not as good
as on a handset. The technology necessitates some volume loss in this situation.
An optional External Microphone can be connected for improved performance.
However, the External Microphone is extremely directional and should only be used
in certain applications. The telephone also provides half-duplex/full-duplex manual
selection.
The DKT2020-FDSP has three operational modes for enhanced microphone use
(Best, Good and Normal). These modes allow adjustments for different room
acoustical characteristics. Choosing either the Internal or External Microphone
(RFDM) and proper operational mode should be pre-selected by the system installer.
When the External Microphone option is installed, the telephone’s Internal
Microphone is disabled on all but Voice First Handsfree Answerback calls and OCA
calls. The External Microphone is powered by the phone (no batteries are required)
and does not need to be turned off when not in use.
Choosing either the Internal or External Microphone is performed on the DIP
switch 5, located under the keystrip (see Figure 4).