[c-nsp] Problem with 10Gig SFP / Fibre link

[Gert Doering]

Hi,

On Thu, Jan 23, 2014 at 05:30:59PM +1100, Ali Sumsam wrote:
> I am using a SFP-10GBase-ER for my Cisco3750X for a 10gig link going to a
> Juniper MX router.
> 
> I am receiving following logs on my Cisco3750X.
> 
>  %SFF8472-5-THRESHOLD_VIOLATION: Te1/1/2: Rx power low alarm; Operating
> value: -21.3 dBm, Threshold value: -20.0 dBm.
> 
> Does this mean I have to increase the power on the interface?

Most likely, you need to help us clear our crystal ball.  What sort
of fiber is this?  How *long* is it?  How many patches?

For a 5m link, -21.3 dBm hints at "one of the plugs is not fully inserted
and the laser has to gap a mm of air".  For a 100km link, you might need
an amplifier...

They keyword to google for is "optical budget".

gert

-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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