Combining signals on one connection is a proven technique also applicable to fiber optic connections.
RAD Data Communications offers this type of fiber optic multiplexers, featuring the following specifics.
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Optimux-106/108
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4 channels E1 and, depending on the model, an ethernet slot
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Optimux-1551/1553
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E1/E3 to STM-1
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Optimux-25/34
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16 channels E1 plus ethernet to E3
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Optimux-45
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21 channels E1 to E3
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