We had a rare condition where we saw 3-4 trunk errors a day on three LH/LX<---30am MMF---->LH/LX links to our core switches (out of about 45 total links we have over a LX/LH-MMF scenario).
We verified DMD issue by putting in a mode conditioning patch cable. Later we just put SX modules in place every time we suspected DMD (Differential Mode Delay). This is a fairly rare situation, and my advice would be to change out optics to SX in instances where physical layer fiber errors are being realized and you're sure patch cables and terminations are true and correct. Mode conditioning patch cables get pricey depending on length required. And we hate having to keep stock for such a rare optical phenomena. Bill White, CCNP, CNE, SCP Network Specialist II Department of Information Technology City of Henderson 240 Water Street P.O. Box 95050 Henderson, NV 89009-5050 702-267-4350 Cell 702-249-0183 Fax 702-267-4302 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Peder @ NetworkOblivion Sent: Wednesday, April 25, 2007 11:05 AM To: Cisco-NSP Mailing List Subject: [c-nsp] LH/LX and Mode Conditioning Cable I know that Cisco says it is required, but does everybody else seem to agree that you need a mode conditioning cable if you use an LH/LX GBIC/SFP over multimode fiber? Or is it a case of "may work, may not work, YMMV"? Also, has anybody ever bought SFP's from here? http://www.memorydealers.com/lxsfpgbforci.html LH SFP's for $59! That is really cheap, but it makes me wonder if it is "too good to be true". Rather than buy some off vendor, maybe I am better off buying some used Cisco LH SFP's to save $$. Peder _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
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