The Physical Layer

Term that refers to loss of strength of a signal is called

• attenuation

• distortion

• Noise

• Impairments

Value of the decibel is positive, if signal is

• Attenuated

• Distorted

• Noisy

• Amplified

Type of computer data transmission in which start/stop transmission bits are not required is termed as

• synchronous

• pulse

• asynchronous

• intermittent

Transmission type which transmits data one character at a time, with the sender and receiver not synchronized with each other is termed as

• synchronous

• ethernet

• asynchronous

• internet

The modulation techniques used to convert analog signal into digital signal are

• a.Pulse code modulation

• b.Delta modulation

• c.Amplitude modulation

• Both a and b

The sequence of operations in which PCM is done is

• a) Sampling, quantizing, encoding

• b) Quantizing, encoding, sampling

• c) Quantizing, sampling, encoding

• d) None of the above

High SNR means

• Signal more corrupted by Noise

• Signal less corrupted by Noise

A signal is measured at two different points. The power is P1 at point first point, and power is P2 at second point. The dB is zero means

• P2 is zero

• P2 equal to P1

• P2 larger than P1

• P2 smaller than P1

--------------- is a type of transmission impairment in which outside source such as cross talk corrupt a signal

• Attentuation

• Noise

• Distortion

• Decibel

Video broadcasting uses ...................transmission

• Asynchronous

• Synchronous

• Isochronous

• None of the above