Lesson 1/Learning Event 5
Figure 1-8.
Signaling Frequency Interface
c. Signaling
Interface.
SF units must be compatible; that is, a
1,600-Hz SF unit
at one end of a circuit must face a similar unit at the
opposite end of
the system.
If there is a 2,600-Hz SF unit at the
opposite end of
a circuit, the system must be modified.
The two
arrangements most
widely used are shown in figure 1-8.
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