[c-nsp] SFP connectors wavelength

[sthaug at nethelp.no]

> > Anyone else have issues with the 1300/1310nm optics with the GBIC/SPF gear
> > from cisco?
> 
> The gigabit Ethernet wavelengths are standardized... SX is 850nm, LX/LH is
> 1310nm, and the "ZX" (the really long reach 70-100km stuff) is 1550nm. The
> wavelengths are determined by the various operating windows which are a
> physical characteristic of the fiber optic strand, so it's not something
> the marketers can play with.

Also, this stuff is sufficiently broad spectrum that 1300 nm vs 1310 nm
isn't really all that important. Consider the fact that a fiber pair with
LX/LH at one end and ZX at the other end may work most of the time, and
you get some idea of just *how* broad spectrum it is.

> This of course assumes you're not talking about CWDM or DWDM optics...

Yup, CWDM and DWDM is a whole different ballgame.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no