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Chapter 12: Metallic Cable Transmission Media – Review Notes

Chapter 12: Metallic Cable Transmission Media

This is the summary notes of the important terms and concepts in Chapter 12 of the book "Electronic Communications System" by Wayne Tomasi. The notes are properly synchronized and concise for much better understanding of the book. Make sure to familiarize this review notes to increase the chance of passing the ECE Board Exam.


CHAPTER 12

METALLIC CABLE
TRANSMISSION MEDIA


Items

Definitions

Terms

1

Provides a conduit in which electromagnetic signals are
contained.

Guided Transmission Media

2

Emitted then radiated through air or a vacuum.

Unguided Transmission Media

3

Used to propagate electromagnetic signals between two
locations in a communications system.

Cable Transmission Medium

4

Most common means of interconnecting devices in local area
networks.

Cable Transmission Systems

5

Metallic conductor system used to transfer electrical energy
from one point to another using electrical current flow.

Transmission line

6

Two basic kinds of waves.

longitudinal and transverse

7

The rate at which the periodic wave repeats.

Frequency

8

Currents that flow in opposite directions in a balanced wire
pair.

Metallic circuit currents

9

Currents that flow in the same direction.

Longitudinal currents

10

Cancellation of common mode signals.

Common mode rejection

11

One wire is at the ground potential, whereas the other is at
signal potential.

Single-ended or unbalanced

12

A circuit device used to connect a balanced transmission line
to an unbalanced load.

balun

13

Most common metallic cables used to interconnect data
communications systems and computer networks.

Parallel-conductor transmission lines and
coaxial transmission lines.

14

Formed by twisting two insulated conductors around each other.

Twisted-pair

15

Types of twisted pair.

Unshielded twisted pair and Shielded
twisted pair

16

Coupling that takes place when a transmitted signal is coupled
into the received signal at the same end of the cable.

Near-end crosstalk

17

Standard color code specified by the EIA for CAT-5 cable.

Pair 1: blue/white stripe
and blue
Pair 2: orange/white
stripe and orange
Pair 3: green/white stripe
and green
Pair 4: brown/white stripe
and brown

18

Woven into a mesh.

Braid

19

Name given to the area between the ceiling and the root in a
single-story building or between the ceiling and the floor of the next higher
level in a multi-story building.

Plenum

20

Used for high data transmission rates to reduce losses and
isolate transmission path.

Coaxial

21

Refers to the woven stranded mesh that surrounds some types of
coaxial cables.

Shielding

22

One layer of foil insulation and one layer of braided
shielding.

Dual shielded

23

Types of coaxial cables.

Rigid air-filled; solid flexible

24

Uniformly distributed throughout the length of the line.

Distributed parameters

25

Transmission characteristics of a transmission line.

Secondary constants

26

Impedance seen looking into an infinitely long line.

Surge impedance

27

Expressed the attenuation and the phase shift per unit length
of a transmission line.

Propagation constants

28

Ratio of the actual velocity of propagation of an
electromagnetic wave through a given medium to the velocity of propagation
through a vacuum.

Velocity factor.

29

Relative permittivity of a material.

Dielectric constant

30

Several ways in which signal power is lost.

Conductor loss, radiation loss, dielectric
heating loss, coupling loss and corona

31

Voltage that propagates from the source toward the load.

Incident voltage

32

Voltage that propagates that propagates from the load toward
the source.

Reflected voltage

33

Transmission line with no reflected power.

Matched line

34

Incident power returned (reflected) to the source.

Unmatched or mismatched line

35

Two travelling waves set up an interference pattern.

Standing wave

36

Ratio of the maximum voltage to the minimum voltage or the
maximum current to the minimum current of a standing wave on a transmission
line.

Standing-wave ratio

37

Used to match transmission lines to purely resistive loads
whose resistance is not equal to the characteristic impedance of the line.

Quarter-wavelength
transformers

38

A technique that can be used to locate an impairment in a
metallic cable

Time domain reflectometry (TDR)

39

Return signal.

Echo

40

Simply a flat conductor separated from a ground plane by an
insulating di-electric material.

Microstrip

41

Simply a flat conductor sandwiched between two ground planes.

Stripline

Complete List of Reviewers in Electronic Communications System per Chapter

Important List of Communications Engineering Materials

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