Bernhard Kuemel wrote in a message to Michael Oliver:
 MO> The termination of the cable.
 BK> ?
 MO> The actual converter.
 BK> A LED and a phototransistor?
Fiber connectors cost a lot of money because the mechanical constraints are 
very exacting.  Also, fiber is driven not by a conventional LED, but a US$30 
laser diode.  The costs mount up quickly.
 BK>> 10base2 if there were 2 connectors on each card and this way
 BK>> there
 MO> 1 is for the transmit, the other for the recieve.
 BK> Ahh, are they usually not using one fibre for receiving and
 BK> transmitting? So then I meant 2 pairs of connectors. Like
 BK> every node being a repeater. 
I can't say that I have ever seen a 10Base-FL or 100Base-FX system which was 
not full duplex on the same fiber, but I would not on that basis deny that 
such things exist.  FDDI does use counter-rotating rings, but this is a 
performance and fault-tolerance issue: each ring is full duplex.
 
-- Mike
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