Currently there are many organizations, factories, enterprises with multiple offices separated large distances when the voice signal at a distance of several kilometers, the size of the transmission signal is not clear toilet again. Especially in a noisy environment as large as electrical, steel production ... The expansion of telephone network on the internal optical cable will eliminate the noise signal transmission lines for voice use good nhat.Ung / System Operator of a large scale - Open Voice Internal - Phone's Signal over
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