LX sfp minimum range

Steven Tardy sjt5 at its.msstate.edu
Fri Jan 27 16:45:36 UTC 2012

On 01/26/12 16:33, Pierre-Yves Maunier wrote:
> LX can work on both.
> It can happends that SX works on singlemode but it can fail anytime.
> LX over multimode fibre is documented on Cisco SFP/GBICs datasheets.
> http://www.cisco.com/en/US/products/hw/modules/ps4999/products_tech_note09186a00807a30d6.shtml
> Cisco 1000BASE-LX/LH SFPGLC-LH-SM1SFP-GE-L2Operates on standard single-mode
> fiber-optic link spans of up to 10 km and up to 550 m on any multimode
> fibers.

just because you can doesn't mean you should.

we have experience multiple cases where LX-MMF-LX works great for 3-5+ years...
then one day no longer gets link. swapping to a different fiber pair restores link.
can't remember SX-MMF-SX failing after years of service.

Steven Tardy
Systems Analyst
Information Technology Infrastructure
Information Technology Services
Mississippi State University
sjt5 at its.msstate.edu

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