An increase in signal to noise ratio decreases bit error rate

increase in bandwidth allows an decrease in data rate.

An increase in data rate increases bit error rate

Uses modem (modulator-demodulator) to convert digital data to analog signals and vice versa

Only used for optical fiber

ASK can be used more efficiently to transmit blocks of bits per frequency

For each of the following baseband signals, find the modulated signal m(t) cos10000t , m(t) = cos 1000t

A phase shift of 180 degree is equivalent to flipping the sinusoid or multiplying it by …

If a signal starts at a transmitter with 27 watts of power and arrives at a receiver with 9 watts of power. the signal loss in dB is calculated as follows:

…. transmits data over communication lines such as telephone and cables.

…. uses communication equipment to connect two or more computers and their resources

accepts transmission of data, instructions, or information

connects the sending device to the communications channel.

Communications channel: initiates instruction to transmit data, instructions, or information.

Data transmission specifications: rules and procedures that coordinate the sending and receiving devices.

computer or a specialized communication device

Networks are comprised of at least … end stations, and a medium over which data can be carried.

Guided media

signals propagate in solid media: copper, fiber, coax

propagates between transmitter/receiver pairs