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GLOSSARY
DTMF
Electret Microphone
FET
Hook Switch
IC
FCC
Local Loop
Mark Interval
Pulse Dialing
Ring Wire
Sidetone
Space Interval
Tip Wire
Tone Dialing
USOC
Zener Diode
B
10.
Dual Tone Multifrequency.
A microphone made up of a capacitor with a dielectric that holds a permanent
electric charge.
Field Effect Transistor.
A switch inside the telephone which closes when the receiver is lifted.
Integrated Circuit.
Federal Communications Commission.
The pair of wires between a telephone set and the telephone company Central
Office.
The portion of a dial pulse during which loop current is flowing.
A dialing system in which the number of pulses on the local loop represents the
number dialed.
The red (negative) wire of the local loop.
The sound heard from the telephone receiver due to the speaker's own voice.
The portion of the dial pulse during which current is not flowing.
The green (positive) wire of the local loop.
A dialing system in which a combination of two frequencies on the local loop
represent the number dialed.
Universal Service Order Code.
A diode that has nearly constant voltage drop over a wide range of reverse current.
A;
9.
B;
8.
C;
7.
D;
6.
A;
5.
C;
4.
C;
3.
B;
2.
B;
1.
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Quiz:
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Answers
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