strattan@lindy.Stanford.EDU (Seth Strattan) (07/28/89)
I've wired a couple of RG58A/U Thin-nets and they all hum along quite happily. I know there is a RG58/U although I've never run it. What is the difference between the two. I have a hunch it is a difference in dielectric .. yes? Is the difference relevant to Ethernet installations? Thanks for info, J. Seth Strattan
butzer@rugby.cis.ohio-state.edu (Dan Butzer) (07/28/89)
In article <4074@lindy.Stanford.EDU> strattan@lindy.Stanford.EDU (J. Seth Strattan) writes: >I've wired a couple of RG58A/U Thin-nets and they all hum along quite >happily. I know there is a RG58/U although I've never run it. What >is the difference between the two. I have a hunch it is a difference >in dielectric .. yes? Is the difference relevant to Ethernet >installations? RG58/U cable violates 10Base2 in a couple ways. It's nominal impedance does not fall within 10Base2's 50 ohms +/- 2% requirement. (ie, Belden RG58/U has a nominal impedance of 53.5 ohms.) Also, RG58/U has a solid center conductor, instead of the stranded center as specified. There may be other violations, but these are the 2 that come to mind. You will most likely find that RG58/U cable will work as long as you don't push anything right to the limit, but you don't want it !!! Long ago, some of it was installed around here, and it has proven to be unreliable compared to the A/U cable. The solid center wire breaks easily at the BNC connector. I plan to replace all of the 58/U we have as soon as I can. --Dan -=- Dan Butzer - The Ohio State University Dept. of Computer & Information Science Net: butzer@cis.ohio-state.edu Voice: (614)292-7350 Snail: 2036 Neil Ave Mall, Room 245, Columbus, Ohio, 43210
rh1m+@andrew.cmu.edu (Rudi Jay Halbright) (07/29/89)
You definitely do NOT want to use RG58/U. The solid cable will invariably break and GOOD LUCK trying to figure out where when it does. However you can use RG58 C/U instead of A/U although RG58 A/U is preferred. -Rudi Halbright rh1m@andrew.cmu.edu