Studio Technologies 770 - IFB Telco Interface Configuration; Telephone Interface Send Audio Source

Model 770 User Guide Issue 1, October 1997
Studio Technologies, Inc. Page 25
Model 770
the meter, but to supply talent and support
personnel with excellent cue audio. Thats
what its all about!
IFB Telco Interface
Configuration
Telephone Interface Send Audio Source
One of the nice features of the Model
770s telco interface is the ability to send
an audio signal out the interface. Switches
on the back panel allow the audio source
to be selected, with the choices being the
mixer sections main and AUX outputs,
and the IFB output. Sections 1 , 2, and 3
of the DIP switch located directly above
the telco interfaces modular jack are used
to select the source. (Should the need
arise, more that one source can be se-
lected simultaneously.) Unless there is
a specific need to select main or AUX,
enabling IFB audio as the source should
prove to be the most useful. There may
also be cases where no send audio
source is desired. In this case simply turn
all three switches to their off positions.
Telephone Interface Audible Ringing
A piezoelectric sounder, located inside the
Model 770s enclosure, can be enabled
to provide an audible indication when
ringing voltage is present on the telco
interface. When enabled, a square-wave
signal is sent to the sounder in cadence
with the ringing voltage. Not terribly loud,
it is intended to give the operator a little
auditory nudge that the telephone line
is ringing. Position 5 of the DIP switch
located directly above the telco interfaces
modular jack is used to enable the audible
ringer. As may be expected, in the on
position the audible ringer in enabled.
In most applications having the audible
ringer enabled is preferable, but excep-
tions do exist. The author was told of news
events involving the President of the
United States where disabling the audible
ringer would be a wise move. Having an
audible ringing signal occur during the
middle of a news conference would be
seriously frowned upon!
IFB Program Mute/Dim
Configuration
In traditional news-oriented IFB systems
program audio is fully muted whenever
interrupt is active. In other applications,
such as live sports, it may be desirable
to dim (attenuate) the program audio
whenever interrupt is active. One switch
on the Model 770s back panel allows the
program audio configuration to be se-
lected for either full muting or 10dB dim.
Position 5 of the DIP switch that is located
directly below the talent amplifier output
Figure 7. Detail of back panel showing IFB
telco interface configuration section