Three transmission methods are - correct answer Symplex, half duplex, full duplex The choice of a specific transport medium is influenced by 5 economics and technical considerations such as the: - correct answer Physical construction, type of services, topology and size of the network, transmission path distance, transmission performance characteristics of the cabling. Twisted pair cable is called balanced cable because: - correct answer The physical construction of both conductors and the associated connections transmit information electrically at the same potential referenced to ground. Coaxial cable is unbalanced because: - correct answer The two conductors in the associated connections transmit information electrically at different potentials referenced to ground. __________ current has a rapid increase and decrease of the voltage that cannot be perceived by the eye. - correct answer Alternating or AC __________ refers to a steady value that does not change the polarity of the voltage for the direction of the current. - correct answer Direct current or DC A battery is an example of a _____ source. - correct answer Direct current or DC EMI - correct answer Electromagnetic interference EM I can be __________ or __________ to the cable - correct answer External or internal AXT - correct answer Alien crosstalk What is alien crosstalk? - correct answer Other cables, external to the cable, that cause electromagnetic interference. Five examples of external EMI - correct answer Other cables, motors, fluorescent lighting, switching power supplies, powered radio equipment and antennas Crosstalk definition - correct answer Electromagnetic interference, internal to the cable , that comes from another pair within the sheath Two examples of internal electromagnetic interference - correct answer Cross talk or coming from the cables shield, screen, or other metallic component that is improperly bonded and grounded Net current fields we can directly with __________ - correct answer Distance High-current fields weekend with - correct answer the cube of the distance (fast) Shielding is ineffective for __________ but is effective for __________ - correct answer Net current fields, high-current fields Frequency defined - correct answer The number of cycles a signal is repeated in a given time period. 1 cycle in 1 s = ___ Hz - correct answer 1 60 cycles in 1 s = _____ Hz - correct answer 60 1000 cycles in 1 s = _______________ - correct answer 1 kilohertz (kHz) 1 million cycles in 1 s = _____________ - correct answer 1 megahertz (MHz) 1 billion cycles in 1 s = ___________ - correct answer 1 gigahertz (GHz)