Description : For the 16-PSK and a transmission system with a 10kHz bandwidth, determine the maximum bit rate
Last Answer : 40,000 bps
Description : Rate of change of a signal on a transmission medium after encoding and modulation have occurred
Last Answer : baud rate
Description : The bandwidth required for a modulated carrier depends on:
Last Answer : the baseband frequency range
Description : Category of data transmission if the binary pulse is maintained for the entire bit time?
Last Answer : Return to zero
Description : It is the ratio of the power density radiated in a particular direction to the power density radiated to the same point by a reference antenna, assuming both antennas are radiating the same amount of power
Last Answer : directive gain
Description : It is the symmetrical expectation of the bit error rate in the system.
Last Answer : probability of errors
Description : n digital modulation, it is similar to standard amplitude modulation except there is only two amplitudes possible.
Last Answer : amplitude shift keying
Description : In an AM transmitter with 100% modulation, the voltage of the final RF stage will be
Last Answer : approximately four times the DC supply voltage
Description : Pulse width modulation may be generated:
Last Answer : with a monostable multivibrator
Description : A pulse modulation technique as the width of a constant amplitude pulse is varied proportional to the amplitude of the analog signal at the time the signal is sampled.
Last Answer : PWM, PLM, PDM
Description : Which is not purpose of modulation?
Last Answer : Increase in signal power
Description : Pulse – amplitude modulation signals are multiplexed by using
Last Answer : FET switches
Description : A modulation technique where data rates in excess of 56 kbps can be achieved over telephone circuits
Last Answer : Trellis Code Modulation
Description : The total bandwidth of an NTSC TV signal is:
Last Answer : . 6 MHz
Description : Sixteen different levels (symbols) are used to encode binary data. The channel bandwidth is 36 MHz. The maximum channel capacity is
Last Answer : 288 Mbps
Description : An FDM hierarchy which is formed by frequency – division multiplexing five groups containing 12 channels each for a combined bandwidth of 240 kHz
Last Answer : Supergroup
Last Answer : 6 MHz
Description : It is the thermal noise power normalized to 1- Hz bandwidth:
Last Answer : noise power density
Description : Data rate at which serial PCM bits are clocked out of the PCM encoder onto the transmission line.
Last Answer : line speed
Description : A theory that establishes the minimum sampling rate that can be used for a given PCM systems.
Last Answer : Nyquist sampling theorem
Description : A theory that establishes the minimum sampling rate that can be used for a given PCM systems
Description : ________ defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation.
Last Answer : syntax
Description : Classification of protocol that interprets a frame of data as a group of successive bit combined into predetermined pattern of fixed length, usually 8 bits each.
Last Answer : Character and Byte-oriented protocols
Description : A special type of transmission line that consist of conducting metallic tube through which high frequency electromagnetic energy is propagated
Last Answer : waveguide
Description : The point on the antenna where the transmission line is connected is called _____
Last Answer : feedpoint
Description : A synchronous transmission usually begins with which character
Last Answer : SYN
Description : It involves converting standard logic levels to a form more suitable to telephone transmission lines
Last Answer : igital line encoding
Description : A synchronous transmission usually begins with which character?
Description : It is the transmission of information in any form from one source to one or more destination.
Last Answer : Multiplexing
Description : Synchronous transmission is used because:
Last Answer : no start and stop bits means higher efficiency
Description : The characters making up the message in a synchronous transmission are collectively referred to as the data
Last Answer : block
Description : A transmission of binary data which involves the transmission of two non – zero voltage level
Last Answer : Bipolar
Description : Ethernet is baseband transmission system designed by _____
Last Answer : Robert Metcalfe and David Boggs
Description : They experimented with light transmission cables through bundle of fibers and lead to the development of flexible fiberscope
Last Answer : Van Heel, Hopkins and Kapany
Description : __________ defines how a user gets control of the channel so as to allow transmission.
Last Answer : channel access
Description : Used for transmission of PCM encoded time – division multiplexed digital signal.
Last Answer : T carriers
Description : does its best to get a transmission through to its destination, but with no guarantees
Last Answer : best-effort delivery
Description : It is used to encode the minimum amount of speech information necessary to reproduce a perceptible message with a fewer bits that those needed by a conventional encoder/decoder
Last Answer : vocoders
Description : The reason a CSMA/CD network has a minimum length for packets is:
Last Answer : to make sure all other nodes hear a collision in progress
Description : The minimum optical power a light detector can receive and still produce a usable electrical output signal.
Last Answer : light sensitivity
Description : Suppose a digitized voice channel is made by digitizing 8 kHz bandwidth analog voice signal. It is required to sample the signal at twice the highest frequency (two samples per hertz). What is the bit rate required, if it ... sample requires 8 bits? (A) 32 kbps (B) 64 kbps (C) 128 kbps (D) 256 kbps
Last Answer : (C) 128 kbps
Description : The ratio of the level of the modulated output of a transmitter under conditions of standard test modulation to the level of the demodulated output with no modulation applied both measured with the ... . Reference audio output B. None of these C. Audio frequency response D. Residual noise level
Last Answer : D. Residual noise level
Description : The OSI layer that provides the control functions necessary to establish, manage and terminated the connections as required to satisfy the user reques
Last Answer : Session layer
Description : To permit the selection of 1 out of 16 equiprobable events, the number of bits required is
Last Answer : 4
Description : Width of frequency band just enough to ensure the transmission of information at a required rate and quality required, and under a specified condition and class of emission. A. Occupied bandwidth B. Transmission bandwidth C. Necessary bandwidth D. Frequency bandwidth
Last Answer : C. Necessary bandwidth
Description : The width of the frequency band which is just sufficient to ensure the transmission of information at the rate and with the quality required under a specified condition and class of emission. A. Occupied bandwidth B. Reference frequency C. Necessary bandwidth D. Frequency tolerance bandwidth
Description : Which performance parameter is the minimum amount of optical power required to achieve a specific bit-error rate (BER) in digital systems or a given signal-to-noise ratio (SNR) in analog systems?
Last Answer : Receiver sensitivity.
Description : It is the ratio of the radiated to the reflected energy:
Last Answer : Radiation efficiency
Description : It is the ratio of the largest possible magnitude to the smallest possible magnitude that can be decoded by the digital-to-analog converter in the receiver.
Last Answer : Dynamic range
Description : The upper pulse rate and information carrying capacity of a cable is limited by:
Last Answer : modal dispersion