| http://www.w3.org/ns/prov#value | - In a case where the multiplexer/demultiplexers 71, 72 do not have a function that enables signals other than the main signals to be transmitted at the same time as the main signals, the main signals that enter from the SDH units 51, 52 are simply time-division multiplexed, and then sent to the switch 73, by the multiplexer/demultiplexers 71, 72 at a bit rate twice that of the main signals.
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