Actually every LC patch cable I have seen is swapable.
On Thu, Oct 11, 2012 at 10:28 AM, David Nolan <[email protected]> wrote: > Adam, > > Are these SC or LC connectors? In my experience the fiber on most SC > patch cables can be swapped at the connector, but with LC the fiber > has to be swapped on the backside of the patch panel. > > -David > > On Thu, Oct 11, 2012 at 1:05 PM, Adam Levin <[email protected]> wrote: >> I've got a curious issue in a new small datacenter lab, and I'm curious >> about it. >> >> We just moved our lab to a new facility. In the old lab, we used >> top-of-rack switches (Cisco 9148) with inter-switch links back to a Cisco >> MDS 9222 core. All of the hosts plugged into the 9148s, and the storage >> plugged into the core, and all was Good In The Kingdom. >> >> In the new facility, all of the hosts (and some storage) plugs into >> lightguide fibre patch panels, which run back to a rack that has the 9148s >> and the 9222s. >> >> Here's the problem: when we run cables from HBAs (in hosts or in storage >> systems) direct to the switches, the Tx and Rx are correct. When the >> lightguide patch is in the middle, the Tx and Rx are reversed. >> >> The lightguide panels are straight passthrough, as are the cables, which are >> standard FC cables. So, of course with the lightguide in the middle, the Tx >> and Rx would naturally get mixed. In other words, a duplex cable plugged >> into ports 1/2 on the lightguide would end up reversing the light paths, >> which of course causes problems. >> >> What I'm not sure about is what is normal for this configuration? Do people >> normally buy "crossover" FC cables to use with a patch panel, or do people >> buy proper patch panels which "uncross" the streams? >> >> Thanks! >> -Adam >> >> _______________________________________________ >> 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/ _______________________________________________ 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/
