Bob Fehrenbach wrote: > > Bruce Bowling wrote: > >I wish to take 8 digital channels and multiplex them > >down one fiber optic cable, and demux them back into > >8 channels. The fastest changing signal is around > >0.1 milliseconds. > > I think it is time for a sanity check here. First of all, does > the last sentence above imply that you expect to update each channel > every 100 microseconds? Let's see .. 8 bits every 100 microcseconds > is 12.5 microseconds/bit or 80kb/s. And this is just for one channel > and assumes only 8 bit resolution. Add in some identification bits > (three minimum) and the other channels and you are near > 1 microsecond/bit. If you need high speeds, take a look at the C011 from INMOS. It is designed for transputer Links and uses a serial protocol with 10 MHz or 20 MHz. So it can transver 910 kByte/s or 1740 kByte/s. (bidirectional) It can be attached to a prozessor BUS , with /RW, /CS ... or can operate in stand alone mode, where 8 bit are directly transvered. St. -- __________________________________________________________ | _____________ | | Dipl.-Ing. Stefan M. Ranguelov /____________/| | | ||||||||||||| | | tel.: +49 (30) 20 181 251 | | priv.: +49 (30) 513 66 23 | | s-mail: D-10319 Berlin, Mellenseestr. 39/10 | | ------------------------------------------------------ | | e-mail: ranguelo@informatik.hu-berlin.de | /) WWW: http://www.informatik.hu-berlin.de/~ranguelo (\ / ) PGP key: on request or from WWW-page ( \ _( (|__________________________________________________________|) ) /> (((\ \) /,) / ) / //))/ (\\\\ \_/ / \ \_/ ///// \ / \ / \ _/ \_ /