LX sfp minimum range

Pierre-Yves Maunier nanog at maunier.org
Thu Jan 26 22:33:41 UTC 2012

2012/1/26 George Bonser <gbonser at seven.com>

> SX can actually be a little more versatile.  LX works only over single
> mode fiber.  SX is designed to work over either.  As long as you have SX at
> both ends, you can connect them with either single or multimode fiber as
> long as the fiber type is consistent over the entire run.
It's the contrary.
SX only works on multimode fibre, not on singlemode.

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.


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

Pierre-Yves Maunier

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