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These async time-division multiplexors support up to 4, 8, or 16 channels at speeds up to 19.2 kbps (38890-R2 or 38892-R2) or 64 kbps (38888-R2). And the integral line driver for duplex multimode fiber gives you point-to-point communications over short distances (up to 10,000 feet [3048 m]).
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The figure on page 2 shows a mux merging 16 data channels over dual fiber optic cable. Each data channel can achieve speeds of up to 19.2 kbps with the 38892-R2 or 38890- R2, 64 kbps with the 38888-R2. Technically Speaking...