Bad cable, Electrical characteristics prevents successful data transmission, Bad connector, Bent pins or incorrect pinouts prevent proper connection., Bad port, Confirmed by observing network connection LED and status indicators., Open, Broken strand of copper that prevents current from flowing through a circuit., Short, Two copper connectors touch each other resulting in current flowing through the defect rather than the electrical circuit., Splitting pairs in a cable, Four unused leads in unshielded twisted-pair cable used for connecting a second ethernet connection., dB loss, The signal power of a data transmission may be degraded to the point where the transmission is not correctly interpreted by a receiving device. The loss of power could result from exceeding the distance limitation of a copper or fiber cable., Transposed Tx/Rx Leads, Use of a straight through cable when a crossover cable should be used or vice versa., Cable placement, Electromagnetic interference of copper cables due arrangement., Attenuation, Digital transmission between devices is degraded because the cable exceeds the ethernet distance limitation, Crosstalk, Occurs when an analog connection creates an electromagnetic field around its conductors, iducing waveforms on a nearby analog connection..

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