AM-48 Test Set (18-0015) Unit Description
0015-S03
-11
In QUIET mode, the line will be terminated only if
Switch 13 is set to <TERM>. See Figure 6-1.
Note: The <RCV> jack is not used when connecting
to 2-wire circuits.
• Set <4W> to connect the internal measurement
circuitry to the <RCV> pair, and the internal signal
generator to the <SND> pair. See the upper half of
Figure 6-2.
• Set <4W REV> to reverse the send and receive pairs.
See the lower half of Figure 6-2.
11
Two-position slide switch.
• Set <600 Ω> (usual position for 4-wire) to
A. apply 600 ohms across the receive pair when
Switch 13 is set to <TERM> and,
B. set the send pair source impedance at 600 ohms.
• Set <900 Ω> (usual position for 2-wire) to
A. apply 900 ohms across the receive pair when
Switch 13 is set to <TERM> and,
B. set the send pair source impedance at 900 ohms.
12
Three-position toggle switch. See Table 7-6 for
interaction of this switch with Switch 7 for dialing.
• Set <TONE> to come off-hook to dial either MF or
DTMF (set Switch 7 to <MF> or <DTMF>
accordingly). <TONE> causes a 200 ohm DC short
across T& R of the send pair to simulate a telephone
off-hook condition on 2-wire dial access lines.
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