C.E.S. Model SDI-50 Manual, General Description
4.2 TELEPHONE LINE CONNECTIONS
The Model SDI-50 interfaces directly with a "loop start" telephone
line. Connection to the telephone line is accomplished by plugging
the modular telephone cord supplied with the interconnect into your
telephone company supplied RJ11-C jack. Please note that the
telephone line interface on the interconnect is not polarity
sensitive, and therefore the Tip and Ring connections can be reversed
without any system degradation.
4.3 OPTIONAL CTCSS DECODER
Space has been set aside for the addition of a CTCSS decoder. The
installation list below is for the C.E.S. Model 5732 CTCSS high speed
decoder (although most CTCSS decoders will work without any problem).
Connect the five wires and set the 5732 for the proper CTCSS tone
according to the Frequency Selection Table. See the Jumper Summary
Table in the next section to configure JP6, and follow any operating
instructions sent with the 5732 decoder.
CTCSS is useful for two different applications. The first is for
access security, and the second for an alternative carrier detect
signal.
For access security, connect the decoder as shown below. To use the
decoder as carrier detect, connect it as below but omit the DISABLE
(E12) connection.
5732 WIRE________________IN SDI-50
Decode output (yellow) E8
Tone Input (green) E9
+12 Vdc (red) E10
Ground (black) Ell
Disable (orange) E12
Add a 27K resistor between E3 & E4
All connection points can be found in the upper, left hand corner of
the printed circuit board.
Use the table on the next page to set the switches for the desired
tone.
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