Chapter 5 Review
What does a fiber cleaver do?
A fiber cleaver is used for terminating fiber- optic cable.
What does a modem do?
A modem acts as a modulator or de- modulator. It modulates digital signals into analog signals at the transmitting end, then demodulates analog signals into digital signals at the receiving end.
Which categories of twisted- pair cable can support Gigabit Ethernet?
Cat 5e and higher
What is the earliest twisted- pair cabling standard that meets the minimum requirements for 10 Base- T transmissions?
Cat 6a
A term used to refer to a type of twisted-pair cable. All of the category cables fall under the TIA/ EIA 568 standard.
Cat or Category
What kind of cables uses BNC connectors? F- connectors? Which connector is likely to be used by cable TV?
Coaxial cable, coaxial cable, F- connector
A multiplexing technique used over a single- mode or multi- mode fiber- optic cable in which each signal is assigned a different wavelength for its carrier wave.
D W D M or Dense Wavelength Division Multiplexing
Which of the following is not an example of a broadband transmission?
Ethernet
Cross -talk measured at the far end of the cable from the signal source.
Far end cross talk or F E X T
What fiber is used in fiber- optic cabling to protect the inner core and prevent the cable from stretching?
In fiber- optic cabling, strands of Kevlar is the fibers used to protect the inner core and prevent the cable from stretching
The amount of data that a medium transmits during a given period of time.
Through put
Physical layer standard for networks that specifies 1 Gbps transmission over fiber-optic cable using base band transmission, relying on 1300 nano-meter wavelengths.
1000 Base -LX
A physical layer for networks that achieves 1 Gbps over Cat 6 or better cabling using only two pairs of wires.
1000 Base -TX
Why do A P C ferrules create less back reflection than do U P C ferrules?
APC ferrules creates less back reflection than do UPC ferrules because the end faces are placed at an angle to each other.
A character encoding system consisting of 128 characters.
ASCII
What devices can boost an analog signal? A digital signal?
Amplifier, repeater
Which type of transmission is measured in baud rate?
Analog
How is latency measured and in what unit?
Latency is the delay from when the data leaves the source and from when it arrives. The unit of measurement for latency is R T T or Round Trip Time.
A form of transmission that allows multiple signals to travel simultaneously over one medium.
Multiplexing
Which type of cross- talk occurs between wire pairs near the source of a signal?
N E X T or Near end cross talk
Which part of a toner and probe kit emits a tone when it detects electrical activity on a wire pair?
Probe
Why is S M F more efficient over long distance than M M F?
S M F is more efficient over long distance than M M F because signals traveling over multi- mode fiber experience greater attenuation than those traversing single mode fiber.
An unwanted connection, such as when exposed wires touch each other.
Short circuit
When an Ethernet NIC has been configured by the OS to use half- duplex, the transmit pair of the twisted- pair cable uses ________ transmissions, the receive pair in the cable uses ________ transmissions, and the twisted- pair cable uses ________ transmissions.
Simplex, simplex, half- duplex
Which kind of multiplexing assigns slots to nodes according to priority and need?
Statistical multiplexing
What characteristic of optical transmissions is primarily responsible for the distance limitations of fiber- optic cabling?
The characteristics of optical transmissions that are primary responsible for distance limitations for fiber- optic cabling are cost and optical loss.
What is the difference between short circuit and open circuit?
The difference between short and open circuit, is a short circuit is an unwanted connection, such as when exposed wires touch each other and an open circuit is where needed connections are missing, such as when a wire breaks.
What is twist ratio and why is it important?
Twist ratio is the number of twists per meter or foot of wire pairs. It is important because the number of twists per foot in a pair of wires translates to the more resistant the pair will be to cross talk or noise.
The distance between corresponding points on a wave's cycle, expressed in meters or feet.
Wavelengths
What are the 4 fundamental properties of an analog signal?
amplitude, frequency, wavelength, and phase