Dear Bruce, I would like to just add my little bit of knowledge here. I have just done an optical communications course at University. They said the simplest way to multiplex signals together is an optical system, where 8 fibres are spliced into one another. Very simple, cheap and works at very high bit rates. However, one would need to use eight controllers to control each signal and eight lasers/LEDs to pump the signal into the cable. There maybe more components, but it might work out cheaper and more reliable at the end of the day. Since the weakest link in the chain (electronic multiplexer) is removed. Anyway, here is my contribution and don't write back asking me how it should be done, I ain't no professional, and I haven't done any revision yet. :-> Anson #################################<*>#################################### # Anson Chuang # # 96, Old Church Street, # # Chelsea, # # London, SW3 6EP Tel:(44)171-376-8975 # # United Kingdom Mobile:(44)410-077601 # # http://dspace.dial.pipex.com/anson.chuang # ########################################################################