On Thu, Jan 26, 2012 at 10:48:05PM +0000, Gary Buhrmaster wrote: > On Thu, Jan 26, 2012 at 13:47, David Storandt <dstora...@teljet.com> wrote: > > You can put a 3dB or 5dB optical pad on the link if the receiver can't > > handle zero-distance optical power. > > As I recall, the problem may not only be the power > (which can cause receiver saturation), but issue that > fibre paths shorter than (around) 2-10m do not properly > condition the light(*), which can result in some issues > at the receiver. > > Gary > > (*) My memory says modal distribution issues. > While 'single mode' fibre only supports one > mode of transmission, it takes a short distance > for the fibre to really be single mode. You can > use a mode filter to address the problem, or just > use fibres that are at least a few meters.
When optics started to become scarce at various times, I've done a number of back-to-back connections using SM fiber and have had zero issues. I wouldn't even worry about it. Remember, many carriers won't even touch MM and they aren't chronically reporting issues or going to lengths to work around them. -Wayne --- Wayne Bouchard w...@typo.org Network Dude http://www.typo.org/~web/
