14.
Assume that the input from the line in figure 1-6 drops to -28 dBm.
The loss for attenuator 1 to maintain equal-level patching conditions
will be
a.
18 dB.
b.
19 dB.
c.
20 dB.
d.
23 dB.
15.
Assume a normal input level to the line in figure 1-6 (-26 dBm).
Assume further that the equipment needs a change in input signal
level from +12 dBm to +10 dBm. The loss for attenuator two will be
changed to
a.
18 dB.
b.
19 dB.
c.
20 dB.
d.
23 dB.
16.
Tactical
telephone networks make extensive use of the
ringdown
feature.
One characteristic of the ringdown feature is that
a.
20-Hz AC voltage causes a drop leaf to fall on the switchboard.
b.
each telephone battery supplies part of the ringing voltage.
c.
a DC potential of 90 volts is applied to the local telephone
loop.
d.
neither party
is
required
to
signal
when
the
call
has
been
completed.
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