12. Bandwidth Utilization: Multiplexing

bandwidth utilization

It is the wise use of available bandwidth to achieve specific goals.

efficiency

It can be achieved by multiplexing.

multiplexing

Efficiency can be achieved by ______.

shared

Whenever the bandwidth of a medium linking two devices is greater than the bandwidth needs of the devices, the link can be _____.

multiplexing

It is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.

single data link

Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a ______.

traffic

As data and telecommunications use increases, so does _____.

n

a single link contains _ channels.

• frequency-division multiplexing (FDM)

• wavelength-division multiplexing (WDM)

• time-division multiplexing (TDM)

categories of multiplexing (HINT: FWT)

analog

Frequency-Division Multiplexing: analog or digital?

analog

Wavelength-Division Multiplexing: analog or digital?

digital

Time-Division Multiplexing: analog or digital?

TRUE

[TRUE or FALSE] # of input/output lines = # of channels

FDM

It is an analog multiplexing technique that combines analog signals.

FDM process (3 carrier signals combined/added)

FDM demultiplexing

bandpass filter

FDM demultiplexing uses a ___.

540kHz

wavelength-division multiplexing (WDM)

It is designed to use the high-data-rate capability of fiber-optic cable.

TRUE

[TRUE or FALSE] The optical fiber data rate is higher than the data rate of metallic transmission cable.

TRUE

[TRUE or FALSE] Using a fiber-optic cable for one single line wastes the available bandwidth.

multiplexing

It allows us to combine several lines into one.

synchronous time-division multiplexing (synchronous TDM)

It assigns a fixed time slot to each connected device, whether the device transmits data or not.

asynchronous time-division multiplexing (asynchronous TDM)

With _______, time slots are flexible, and assigned when connected devices have data that is ready to send.

time-division multiplexing (TDM)

It is a digital multiplexing technique for combining several low-rate channels into one high-rate one.

TRUE

[TRUE or FALSE] In synchronous TDM, data are taken from each line every second.

synchronous TDM

synchronous TDM

empty slots

synchronous TDM

statistical TDM

multilevel multiplexing

It is a technique used when the data rate of an input line is a multiple of others.

TRUE

[TRUE or FALSE] In multilevel multiplexing, sometimes the bit rates of sources are not multiple of integers of each other.

dummy bits

To make the data rate compatible in multilevel multiplexing, _____ are added to input lines.

pulse stuffing

It is the practice of adding non-data bits to a binary signal before that signal is transmitted over a network.

pulse stuffing

It is often used as a means of controlling synchronization in systems that require both transmitter and receiver to transmit at the same bit rate.

framing bits