Dkt2020-Fdsp Full-Duplex Speakerphone With External Microphone - Toshiba Strara CTX Series Installation And Maintenance Manual

Station Apparatus
DKT2020-FDSP Full-Duplex Speakerphone with External
Microphone
Note Not available in the UK & Europe.
The DKT2020-FDSP is designed to allow both parties of a speakerphone call to speak simultaneously.
This eliminates "clipping" and enables true two-way conversation. However, when two parties are
talking simultaneously, the 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
Important!
The DKT2020-FDSP's full-duplex operation depends on the speaker volume setting. Raising or
lowering speaker volume directly affects the performance of the full-duplex operation.
Depending on the room's echo characteristics, raising the volume of the speakerphone can cause
the full-duplex operation to deteriorate. When set to maximum volume, it may be necessary to
switch to half-duplex operation.
The speakerphone will automatically reduce volume in each direction when both the FDSP user
and the distant party are talking at the same time. The volume reduction is required to control the
echoes at high volume levels. It is possible for surrounding conversations and other sounds to
trigger this effect even when you are not speaking.
The performance of the DKT2020-FDSP can vary on calls that involve a delay, such as wireless
calls, Voice Over Internet Protocol calls, etc. With these types of calls, the quality can diminish.
When using the [PDN] or Intercom button, the performance for internal calls is not as good as for
external calls.
DIP Switches
The DKT2020-FDSP has DIP switches that enable the External Microphone and use telephone use in
other countries. The DIP switches are under the flexible button key strip (see
There are three different DIP switch settings for optimum operation in various types of environments:
Best – provides full-duplex operation with the Internal or External Microphone. This is ideal for a
large enclosed area, such as an office with little echo. Echo varies according to the environment.
For instance, a room that is relatively empty has more echo than a room with furniture or items that
can absorb sound waves.
7-44
7-36).
Figure 7-36).
Strata CTX I&M September 2002