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This invention allows multiple Control Units (CUs) to share a single fiber-optic link to support all the devices normally attached by means of coax or twisted pair media. (Image Omitted)
English (United States)
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Digital Multiplexing Technique for Use With Fiber-Optic Technology
This invention allows multiple Control Units (CUs) to share a single fiber-
optic link to support all the devices normally attached by means of coax or
twisted pair media.
A technique is described for multiplexing CU signals. By using hardware shift
registers and First-In, First-Out Storage (FIFOS), it is able to drive and receive
"off the shelf" fiber-optic emitter LEDs and P-I-N photodiodes. Unlike the analog-
modulated circuitry and time division scanning schemes used with fiber optic
transceivers, this technique uses a synchronous boost and then reassembly
Signals from the sending CUs or devices are fed to FIFOs where they are
held until eight bits are available and then unloaded at a 2.3 mhz rate. The
unloading continues until the specific FIFOs total message is complete. The
FIFO is sixteen bits long to allow for oscillator tolerance variation between the
message sending oscillator and the oscillator required in the fiber-optic redrive
Fig. 1 shows very generally the logic flow from four CUs through the devices
and similar return path. The number of CUs need not be limited to four; the
practical limit will be determined by the availability concerns.
Fig. 2 shows how lower speed data streams are combined and boosted to a
higher speed for transmission over the fiber link. The sync bits are used to re-
orient the received data.