Neutral Direct-current Telegraph System

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multilevel precedence and preemption multipath multiple access multiple homing multiplex baseband multiplexing multiport repeater narrative traffic narrowband modem national communications system national information infrastructure	near field diffraction pattern near real time negative acknowledge character neper net gain net operation network administration network architecture network engineering network interface network interface device	network management network operating system network termination 1 network topology noise noise equivalent power noise figure noise level noise power noise temperature noise weighting	noisy black noisy white non fixed access non return to zero normalized frequency ep telecommunications n entity nuclear hardness numerical aperture nyquist interval off axis optical system