When working with fiber lengths, you *always* want to consult the specifications of your optics modules.
For example, we use a lot of hardware from Force10 Neworks here (They've been bought out by Dell, which is advantageous for us, for other reasons). My spec sheet for their 10GbE SFP+ optics modules says 300 meters on multi-mode using 850nm wavelength (10GBASE-SR), as long as it's OM3 or OM4 spec, but I don't have lengths for OM1 or OM2 MMF (I vaguely recall it was 150m, but I don't know for sure). For the 10GBASE-LR (1310nm), you use single-mode for up to 10km. For the 10GBASE-ER (1550nm) you use single-mode for up to 40km. In general, you can use 850nm on multi-mode, and 1310nm and 1550nm on single-mode. There are a few applications (eg. 10GBASE-ESR), which pair 1310nm with multi-mode, but they're rare and will probably be more expensive than you want to pay. And of course everything changes when you're talking about faster speeds, eg. 40GBASE or 100GBASE. TLDR: At the lengths you're talking about, it's going to depend on what the optics vendor will support. Lloyd Brown Systems Administrator Fulton Supercomputing Lab Brigham Young University http://marylou.byu.edu On 03/18/2013 09:38 AM, Michael Torrie wrote: > On 03/18/2013 08:24 AM, David Landry wrote: >> Unjacketed fiber is commonly sold in spools between 10km and 50km. That >> would require you to jacket them and connectorize them yourself. I also ran >> across jacketed, pre-terminated spools here: >> http://www.lanshack.com/Outdoor-Pre-Terminated-Assembly-C51.aspx > > So does anyone know what fiber one would use for a short link, say 250 > meters or so? Multimode or singlemode? Singlemode is slightly cheaper > and has no significant bandwidth cap on it. But I can't get a clear > answer on the interwebs as to which kind is best to use for what. > > /* > PLUG: http://plug.org, #utah on irc.freenode.net > Unsubscribe: http://plug.org/mailman/options/plug > Don't fear the penguin. > */ > /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
