On Mon, 10 Jan 2005, Bill Wichers wrote:
You should be safe using LX optics over multimode fiber. Mode
conditioning
The original poster wanted to know if SX optics over SM fiber was ok (as
stated in the topic).
Yes, I saw that just after writing and sending the first reply, unfortunatly.
A similar question was asked here several months ago, and I replied to
that one and will just summarize here... SX optics are *not* repliable
over singlemode fiber since they will not couple in enough light to work
reliably. I have seen it work over short distances, but would not
recommend it in a production network nor would I expect it to even come
close to the published distances SX will work over MMF.
The problems come from the SX optics being designed to couple light into a
much larger aperature (50-62.5 um) than SMF has (9-10 um). There are some
other issues from LED instead of laser light propagation in the fiber, but
the aperature size is a killer for performance in this case.
-Bill
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Waveform Technology
UNIX Systems Administrator
11 messages in net.nether.puck.cisco-nsp[c-nsp] Catalyst SX GBIC's and SMF
