Digital Telephone Hybrid
Rio Rancho, NM
17
Telephone Interface/
Acoustic Echo
Canceller
Codec Interface/
Acoustic Echo
Canceller
Used to initiate telephone calls from the control panel through the DMTH4 when computer
is connected to unit. Section includes telephone interface controls and level meters to
indicate level of ERL or ERLE applied.
Ringing indicator - blinks yellow if an incoming call is present.
Connect/Disconnect button - Toggles the connection state of the interface. Enabled
only when the control panel is connected to a DMTH4.
Connection indicator - glows red to indicate the telephone interface is connected.
Privacy button - Toggles the privacy state of the interface. Enabled only when the con-
trol panel is connected to a DMTH4 and the interface is in the connected state.
Privacy indicator - glows red to indicate that privacy is engaged.
Redial button - Used to redial the last number called.
Phone Book button - Used to access the DMTH4’s internally stored Phone Book.
Telephone Number list - Used for typing in the telephone number to be dialed when
the Dial button is clicked. It is enabled only when the control panel is connected to a
DMTH4. This control has a “memory”. Once a number has been dialed, additional num-
bers may be typed in without losing previously entered numbers. To recall a previously
entered telephone number, click the “dropdown” button to display the list and and click
on desired number to select. Double click a number to cause it to be dialed immedi-
ately.
Dial button - Click to dial the telephone number displayed in the telephone number list.
It is enabled only when the control panel is connected to a DMTH4. If the telephone
interface is not connected to the line, it will be automatically connected before the
number is dialed.
Tone pad - complete DTMF dial pad for dialing telephone numbers through the control
panel.
Flash button - used to momentarily place the telephone interface in an “on-hook” con-
dition. Enabled only when the interface is in the connect state.
AEC Enabled - glows to indicate that AEC is enabled.
ERL - “Echo Return Loss” meter displays dB of attenuation and represents the echo
return loss resulting from the acoustic path(s) in the room.
ERLE - “Echo Return Loss Enhancement” meter represents the additional echo return
loss achieved by the action of the AEC and is displayed as
dB of attenuation.
Used to control the Codec Interface and Codec Acoustic Echo Canceller when the com-
puter system is connected to the DMTH4.
Connect/Disconnect button - Toggles the connection state of the interface. Enabled
only when the control panel is connected to a DMTH4.
Connect indicator - glows red if codec interface is connected.
Privacy button - Toggles the privacy state of the interface. Enabled only when the con-
trol panel is connected to a DMTH4 and the interface is in the connected state.
Privacy indicator - glows red to indicate that privacy is engaged.
AEC Enabled - glows to indicate that AEC is enabled.
ERL - “Echo Return Loss” meter represents the ratio between the telephone transmit
signal and the reference signal presented to the AEC. Displayed as
dB of attenuation
and represents the echo return loss resulting from the acoustic path(s) in the room.
ERLE - “Echo Return Loss Enhancement” meter represents the additional echo return
loss achieved by the action of the AEC and is displayed as
dB of attenuation.
Name
Description
Содержание DMTH4
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