Definition: | a channel that has a standardized bandwidth suitable for the transmission of telephone quality speech in multichannel carrier transmission, and that occupies one of a number of specified positions in the frequency spectrum
NOTE 1 – An FDM telephone channel normally has a standardized bandwidth of 4 kHz, this being sufficient for a signal occupying a frequency band of 300-3 400 Hz, for outband signalling, and for the required guard bands.
NOTE 2 – Signals, other than speech signals, having appropriate specified characteristics may occupy the whole or a part of an FDM telephone channel.
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