Studio Technologies 48 - Manual (Page 9)

Issue 1, October 2000 Model 48 User Guide
Page 10 Studio Technologies, Inc.
All Model 48’s jacks are configured to
be compatible with both RJ11 and RJ14
wiring schemes, allowing connection of
one or two telephone lines per jack.
Modular Cables
In most cases, source (input) and destina-
tion (output) signals will connect to the
Model 48 using standard telephone-type
modular cables. It’s important to note that
these cables reverse the polarity of the
signals they carry. Figure 4 shows the
wiring of a typical modular cable that
implements four of the six possible con-
nections. The Model 48 takes the cable’s
reversal into account by reversing the
connections on the source (input) jacks.
In this manner signals connected using
standard modular cables will maintain
their proper polarity when passing through
the Model 48.
Source Connections
The Model 48 has six source (input) jacks,
which are located on the back panel.
These are designated as Source 1 through
Source 6. Each of these jacks allows the
connection of one or two telephone lines.
Refer to Figure 5 for connection details.
These jacks are configured under the
assumption that the signal source, or
sources, will terminate on 6-position jacks
that are wired using standard RJ11 (one-
line) or RJ14 (two-line) arrangements. A
further assumption is that standard revers-
ing modular cables will be used for con-
necting these jacks to the source jacks on
the Model 48.
Figure 4. Standard 6-Position, 4-Contact
Modular Cable Connections
Figure 5. Model 48 Source (Input) Jack
Connections
Figure 3. RJ14 Jack Connections
Note that while two telephone lines can
be connected to each of the Model 48’s
source (input) jacks, switching of both
lines is done at the same time. Indepen-
dent switching of two lines connected
to the same source jack is not supported.