Description : In a star-topology Ethernet LAN, _______ is just a point where the signals coming from different stations collide; it is the collision point.
Last Answer : a passive hub
Description : The point on the antenna where the transmission line is connected is called _____
Last Answer : feedpoint
Description : Ethernet is baseband system using CSMA/CD operating at A. 20 Mbps B. 10 Mbps C. 30 Mbps D. 40 Mbps
Last Answer : B. 10 Mbps
Description : It is a large scale integration chip designed for use in telecommunication industry for private branch exchanges, central office switches, digital handsets and digital echo suppressors.
Last Answer : Codec
Description : It is proposed network designed by major telephone companies in conjunction with the ITU-T with the intent of providing worldwide telecommunications support for voice, data, video and facsimile information within the same networ
Last Answer : ISDN
Description : Type of PCM which is designed to take advantage of the sample-to-sample redundancies in the typical speech waveform
Last Answer : Differential PCM
Description : _______ is the cell relay protocol designed by the corresponding Forum and adopted by the ITU-T.
Last Answer : ATM
Description : ____ is a virtual-circuit wide-area network that was designed in response to demands for a new type of WAN in the late 1980s and early 1990s.
Last Answer : . Frame Relay
Description : For the 16-PSK and a transmission system with a 10kHz bandwidth, determine the maximum bit rate
Last Answer : 40,000 bps
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 : 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 : It is the ratio of the transmission bit rate to the minimum bandwidth required for a particular modulation scheme
Last Answer : Bandwidth efficiency, Information density, or Spectral efficiency
Description : Rate of change of a signal on a transmission medium after encoding and modulation have occurred
Last Answer : baud rate
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 : Data rate at which serial PCM bits are clocked out of the PCM encoder onto the transmission line.
Last Answer : line speed
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 : Category of data transmission if the binary pulse is maintained for the entire bit time?
Last Answer : Return to zero
Description : does its best to get a transmission through to its destination, but with no guarantees
Last Answer : best-effort delivery
Description : The line bisecting the major lobe, or pointing from the center of the antenna in the direction of maximum radiation is called _____
Last Answer : line of shoot
Description : A waveguide may also be terminated in a resistive load that is matched to the characteristic impedance of the waveguide. The resistive load is most often called a _____
Last Answer : Dummy resistor
Description : The ISDN channel D designates _____ which contains control information
Last Answer : Data
Description : he building block of a parity or BCC generator is _____
Last Answer : XOR
Description : The ISDN channel B designates _____
Last Answer : Bearer
Description : Low-Earth-orbit (LEO) satellites have _____ orbits.
Last Answer : polar
Description : Data is directly on the transmission cable. A. Asynchronous B. Synchronous C. Baseband D. Broadband
Last Answer : C. Baseband
Description : Multiplexing scheme use by baseband transmission. A. FDM B. Space multiplexing C. TDM D. Statistical multiplexing
Last Answer : C. TDM
Description : Baseband transmission of adigital signal is possible only if wehave a ____channel. A) low-pass B) bandpass C) low rate D) high rate
Last Answer : ow-pass
Description : A system where the modulated RF picture and sound carrier signals are distributed in a cable network, instead of wireless system.
Last Answer : CATV
Description : The width of the vertical sync pulse in the Philippine TV system is
Last Answer : 3H
Description : In the Philippine color television system, the intercarrier frequency, in MHz, is
Last Answer : 4.5
Description : The number of frames per second in the Philippine TV system is
Last Answer : 30
Last Answer : . 30
Description : What distinguishes digital radio systems from conventional analog communications system?
Last Answer : the nature of the modulating signal
Description : It is a system where the digital signals are placed directly on the coaxial cable.
Last Answer : Baseband
Description : It is the symmetrical expectation of the bit error rate in the system.
Last Answer : probability of errors
Description : The magnetic field of an antenna is perpendicular to the earth. The antenna’s polarization ___
Last Answer : is horizontal
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 : The property of interchangeability for the transmitting and receiving operations is known as ____
Last Answer : reciprocity
Description : The fields surrounding the antenna do not collapse their energy back into the antenna but rather radiate it out in space
Last Answer : radiation field
Description : It is the ratio of the radiated to the reflected energy:
Last Answer : Radiation efficiency
Description : It is the resistance that, if it replaced the antenna, would dissipate exactly the same amount of power that the antenna radiates
Last Answer : . Radiation resistance