tgingric@magnus.acs.ohio-state.edu (Tyler S Gingrich) (05/29/91)
I'm looking for anybody who has experience hooking up NeXT machines with twisted pair cabling. We have a NeXT network which, when connected with thin-ethernet, works fine. However, when we connect the NeXTs up to an HP Ethertwist hub, the machines can't find the netinfo server..... 1) The HP Hub appears to be working fine. Lights work as specified in the manuals, etc...... 2) The thin-ethernet cabling is fabricated 1-1,2-2,3-3,6-6. The LEDs on the Hub light up when we connect each NeXT machine (but, the NeXT has no way to say if it knows the connection is made). 3) Distance between nodes shouldn't be a problem (6-8ft currently). What do you suggest? I have access to an ethernet lanalyzer, but the NeXT site is over 75 miles away (so on-site diagnostics are difficult). I will take my lanalyzer next time I go, but it is not an option at this time. Anybody else hooked up NeXTs with twisted pair ethernet??? I need some brilliant suggestions....... Tyler
louie@sayshell.umd.edu (Louis A. Mamakos) (05/29/91)
We're using a few cubes right now with a 10Base-T network. It works just fine. Distance shouldn't be a problem, as the distance from the cubes to the 10Base-T hubs in our case is over 40 or 50 meters. Are you sure that you are using twisted-pair cables and the the correct pairs of wires are twisted together? I assume that the HP hubs that you are using are 10Base-T compatible. louie
jkarab@next.com (John Karabaic) (05/30/91)
Tyler S Gingrich writes > I'm looking for anybody who has experience hooking up NeXT machines with > twisted pair cabling. > > We have a NeXT network which, when connected with thin-ethernet, works fine. > However, when we connect the NeXTs up to an HP Ethertwist hub, the machines > can't find the netinfo server..... > > Anybody else hooked up NeXTs with twisted pair ethernet??? I need some > brilliant suggestions....... > > > Tyler I've run into this problem with some concentrators. See if it implements "link integrity", which made its way into the 10BASE-T spec in Feb 1990 (according to the change page I have here). If not, it won't work and you may be due a free upgrade if they promised you a 10BASE-T-compliant product. Some concentrators also have an "automatic rollover" feature which switches the T/R pairs when they've been connected backwards (but you say you've checked that...). Thanks to the network managers at NeXT Redwood City who helped me when I ran into this myself... -- John S. Karabaic, Systems Engineer, jkarab@NeXT.com, 513 792 5904 NeXT Computer, Inc.; 4434 Carver Woods Dr.; Cincinnati, OH 45242