Ch. 1 * (Principles of Transmission) Flashcards Preview

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Flashcards in Ch. 1 * (Principles of Transmission) Deck (153)
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Most common electrical conductors...

Fiber does not belong

1

Alloying

Adverse effect

2

Advantages of stranded conductors

Except better transmission

3

Another name for insulation

Dielectric

4

North America standard

American Wire Gauge

5

Teflon

Dupont

6

Dielectric strength

Measures maximum voltage an insulation can withstand without breakdown

7

Reason for twisting pairs

Minimize Crosstalk

8

Mutual inductance

Magnetic field

9

Direction of twists

Counter clockwise

10

Where are high temperatures found?

Exterior building walls, ceiling spaces, mechanical rooms

11

Types of shields

Fiber does not belong

12

Braid

Good

13

Foil

Excellent

14

Shield effectiveness

Less than 20 dB = poor
More than 60 dB = excellent

15

Braid/Magnetic Field rating

Poor

16

Drain wires

Applied longitudinally

17

Analog signal

Sign wave

18

Range of human hearing

20-20,000 Hz

19

Frequency of telephone circuits

300-3,400 Hz

20

Wave

Sinusoidal

21

Sinusoidal theory

Joseph Fourier

23

Phase

Time

24

One watt of power on your input and one milliwatt of power on your output - what is the total amount of power lost in dB?

30

25

Telecommunications transmission system consists of three basic components:

Source
Medium
Receiver

26

Speed of light

186,000

27

Speed of cable

.56c - .74c

28

Round-trip delay for satellites

.25

29

Power source options for VoIP

Except "bridge"

30

Digital signals

Discrete steps