Guided

Question 1

All electronic communication systems have a 1._______,
2._________, and a 3_______.

Answer 1

1.transmitter
2.communication channel or medium
3.receiver

Question 2

_______ is the physical
path between transmitter and receiver.

Answer 2

transmission medium

Question 3

transmission medium can be
categorized as ________ and ______ transmission media

Answer 3

guided and unguided

Question 4

electromagnetic waves are guided along a solid medium, such as copper twisted pair, copper coaxial cable, and optical fiber.

Answer 4

guided media

Question 5

wireless transmission occurs through the atmosphere, outer space, or water.

Answer 5

unguided media

Question 6

The characteristics and quality of a data/signal transmission are determined both by the 1. __________ and by the 2._________.

Answer 6

1. characteristics of the medium
2. characteristics of the signal

Question 7

the medium itself is more important in
determining the limitations of transmission, e.g. the physical and
electrical properties.

Answer 7

GUIDED

Question 8

the bandwidth of the signal produced by the transmitting antenna is
more important than the medium in
determining transmission characteristics.

Answer 8

UNGUIDED

Question 9

are the key considerations in data transmission system design, with emphasis placed on achieving the
highest data rates over the longest distances.

Answer 9

Data rate and distance

Question 10

All other factors remaining constant, the greater the bandwidth of a signal, the higher the data rate that can be achieved.

Answer 10

BANDWIDTH

Question 11

Impairments, such as attenuation, limit the distance.

Answer 11

IMPAIRMENTS

Question 12

Interference from competing
signals in overlapping frequency bands
can distort or cancel out a signal.

Answer 12

INTERFERENCE

Question 13

It can be any physical facility used to propagate electromagnetic signals between two locations in a communication system.

Answer 13

GUIDED MEDIA

Question 14

For guided transmission media, the __________, in terms of either data rate or bandwidth, depends critically on the distance and on whether the medium is point-to-point or multipoint.

Answer 14

transmission capacity

Question 15

Guided transmission media can be generally classified as

Answer 15

BALANCE AND UNBALANCE

Question 16

What guided transmission media that both conductors carry current

Answer 16

Balanced (Differential)

Question 17

What guided transmission media that
one conductor carries the signal while the other is at a ground potential

Answer 17

Unbalanced (Single-ended)

Question 18

Balanced transmission line can be connected to unbalanced line or vice versa with special transformers called

Answer 18

BALUNS

Question 19

Common types of balanced (parallel) line

Answer 19

Twin lead
Twisted pair

Question 20

Common types of unbalanced (single-ended) line

Answer 20

Coaxial cable

Question 21

consist simply of two parallel wires with a solid dielectric is used along the whole length of the wire which provides uniform spacing along the entire length

Answer 21

Twin lead

Question 22

the least expensive and most widely used
guided transmission medium. it consists of two insulated copper wires arranged in a regular spiral pattern.

Answer 22

Twisted pair

Question 23

In twisted pair the twisting tends to decrease the _________between adjacent pairs in a cable.

Answer 23

crosstalk interference

Question 24

consists of one or more twisted-pair cables, typically enclosed within an overall thermoplastic jacket, which provides no electromagnetic shielding.

Answer 24

Unshielded twisted pair (UTP)

Question 25

is subject to external electromagnetic interference, including interference from nearby twisted pair and from noise generated in the environment

Answer 25

Unshielded twisted pair

Question 26

Each pair of wires is individually shielded with metallic foil, generally referred to as

Answer 26

Foil twisted pair (FTP).

Question 27

There is a shield around each individual pair, as well as around the entire group of wires. This is referred to as

Answer 27

Fully shielded twisted pair or shielded/foil
twisted pair (S/FTP).

Question 28

In 1991, the Electronic Industries Association published standard __________ which specifies the use of voice and data-grade UTP and
F/UTP cabling for in-building data applications.

Answer 28

ANSI/EIA/TIA-568

Question 29

Generic Telecommunications Cabling for Customer Premises
- enables the planning and installation of a structured cabling system for all types of customer premises.

Answer 29

ANSI/TIA-568-C.0

Question 30

Commercial Building
Telecommunications Cabling Standard
- enables the planning and installation of a structured cabling system for commercial buildings.

Answer 30

ANSI/TIA-568-C.1

Question 31

in this context, refers to the
amount of attenuation across the link from the transmitting system to the receiving system. Thus, lower dB values are better.

Answer 31

Insertion loss

Question 32

Attenuation in decibels is a linear function of

Answer 32

distance

Question 33

________ ,as it applies to twisted-pair wiring systems, is the coupling of the signal from one pair of conductors to another pair.

Answer 33

Near-end crosstalk (NEXT) loss

Question 34

loss varies as a function of frequency, with losses increasing as a function of frequency.

Answer 34

NEXT

Question 35

_________ varies as a function of frequency, with losses increasing as a function of frequency.

Answer 35

Attenuation-to-crosstalk ratio (ACR)

Question 36

like twisted pair, consists of two
conductors, but is constructed differently to permit it to operate over a wider range of frequencies.

Answer 36

Coaxial cable

Question 37

refers to the woven or stranded mesh (or
braid) that surrounds some types of coaxial cables

Answer 37

Shielding

Question 38

is the original military specification for coaxial cables. The numbers following
RG in a part number are generally an indicator of size, referring to the diameter of the cable.

Answer 38

RG, or Radio Guide