Studio Technologies 48 - Manual (Page 10)

Model 48 User Guide Issue 1, October 2000
Studio Technologies, Inc. Page 11
This is not a limitation as in most cases
only one telephone line will be connected
to each source jack. The ability to sup-
port two lines per jack is an option that
enables special installations to be easily
implemented.
Destination Connections
The Model 48 has 11 destination (output)
jacks, ten of which are located on the
back panel and one on the front. These
are designated as Destination A through
Destination E. Refer to Figure 6 for con-
nection details.
while the second jack could connect
to a jack located on an I/O panel of
an ENG vehicle.
One destination jack is located on the
front panel and is associated with destina-
tion E. This jack is provided for “conve-
nience” use and is not intended to be
permanently connected to another piece
of equipment. For example, for testing
purposes a telephone could be plugged
directly into this jack, eliminating the
need to access the back of the Model 48.
Another example might be to provide
a temporary telephone line connection
to portable equipment, such as a field
producer’s notebook computer modem.
Special
Applications
There are a number of special applica-
tions that can be served by the Model 48.
The following sections provide several
examples.
Model 770 IFB Telco Interface
The Model 770 is a combination mixer/IFB
controller available from Studio Technolo-
gies. The Model 770’s IFB section con-
tains a telephone line interface that is
compatible with “wet” or “dry” signals.
“Wet” signals are defined as standard
telephone lines that have a DC bias signal.
(Generally –48V, and high-voltage ring-
ing.) “Dry” signals are defined as tele-
phone-line-associated signals that do
not have a DC voltage present. Often a
fax or modem adapter associated with a
cell phone may provide a “dry” telephone
signal. The Model 770’s telephone inter-
face uses a standard 6-position modular
Figure 6. Model 48 Destination (Output) Jack
Connections
Each of these five destinations is associ-
ated with a group of front-panel push-
button switches. These five destinations
and associated switches can be thought
of as the Model 48’s five switching chan-
nels. On the back panel, two jacks are
associated with each of the five destina-
tions. The two jacks associated with each
specific destination are internally wired in
parallel (“multed”), thus providing access
to the identical signals. This is provided
for installation flexibility. For example, one
of the jacks could connect to a telephone
coupler associated with an IFB system,