Another test you can do is connect one end of the fiber cable to the switch and look at the other end of the cable through the electronic viewfinder of a digital camera. They can usually see the light coming through, which is at a wavelength the human eye can't detect. It usually looks like a bright white light. This works very well for 1Gb fiber connections - I haven't had luck with this at 10Gb for a reason I've yet to determine. Some digital cameras block this wavelength but none of my iPhones or blackberries ever have.
Dan On Mon, Nov 29, 2010 at 11:03 AM, John BORIS <[email protected]> wrote: > David, > Thanks. That makes another plus for me to get the fiber line back on > line. > >>>> <[email protected]> 11/29/2010 1:47 PM >>> > On Mon, 29 Nov 2010, Matt Simmons wrote: > >> The reasons to go with fiber over copper are (in order of precedence >> in my mind, anyway): >> >> 1) Length >> >> If you're over the 100m distance (or really, anywhere close to it), >> you'll need to use fiber >> >> 2) Interference >> >> Copper cables are subject to EMI, which optical fiber isn't. If > you're >> running networking through, oh I dunno, crazy manufacturing spaces >> with all kinds of electromagnets and bizarre electrical fields, then >> maybe glass (or plastic, more likely) is the way to go >> >> 3) Future-proofing >> >> If you're running backbone cable, you probably want to use fiber, if >> only because it's nearly futureproof (just run more than you think >> you'll need). Last time I checked, the top throughput of single mode >> fiber hadn't even been determined, let alone approached. As faster >> transceivers are put into place, if your wiring infrastructure can >> stay the same, then that's a big win. > > 4) switch isolation > > If you have bad power the fact that you don't have a conductor between > > switches can make things more reliable (eliminating ground loops). this > > problem is more likely with longer distances. > > If you are setting up High Availability with two switches and different > > servers connected into each switch, having a fiber connection between > switches means that no matter what happens inside one switch, it cannot > > send excessive voltage to the other switch via the connecting cable. > > David Lang > _______________________________________________ > Tech mailing list > [email protected] > https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech > This list provided by the League of Professional System Administrators > http://lopsa.org/ > _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
