Inter-symbol interference (ISI) is an impairment of data communications systems that limits the reach and bandwidth (capacity to carry information) of the network. Ethernet and Fibre Channel systems transmit information using digital transmission (0s and 1s). When the transmission laser is on, a digital 1 is transmitted; when it is off, the signal is for a digital 0.|Inter-symbol interference (ISI) is an impairment of data communications systems that limits the reach and bandwidth (capacity to carry information) of the network. Ethernet and Fibre Channel systems transmit information using digital transmission (0s and 1s). When the transmission laser is on, a digital 1 is transmitted; when it is off, the signal is for a digital 0.

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