question about optics

I've ran into a couple older deployments that erroneously have a ZX GBIC
with a single mode connection into another switch with a LX/LH SFP (the
span is < 100feet without attenuation on either end). These links have
been up for years like this. I always thought the following about Cisco
optics in regard to frequency.

Sx = 850

LX/LH=1310

ZX=1550

If this is indeed the case, how is the link brought up between optics
running different frequencies?

Thanks,

Justin Guagliata

Atos Origin

Blogs and organic groups at http://www.ccie.net
Received on Wed Jun 10 2009 - 09:32:46 ART