On Sunday, July 10, 2011 07:05:16 AM Giles Coochey wrote: > I guess what I was trying to say is that for fiber connections duplex > has no meaning, was there ever a fiber 'hub' where multiple point to > point connections 'shared' a medium? (in a virtual sense) You can make/get passive fiber hubs that act like old thinnet. They aren't common, and I don't recall if any GigE ones exist. You can actually make these if you have a fusion splicer with enough manual controllability. So, yes, you can have a true CSMA/CD fiber hub, where the hub is a totally passive fiber device.