[115112] in North American Network Operators' Group
Re: Eye protection in DWDM systems -- what threshold?
daemon@ATHENA.MIT.EDU (David Freedman)
Tue Jun 9 06:44:10 2009
To: nanog@nanog.org
From: David Freedman <david.freedman@uk.clara.net>
Date: Tue, 09 Jun 2009 11:43:02 +0100
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In-Reply-To: <D338D1613B32624285BB321A5CF3DB250CCD14F7D7@ginga.ai.net>
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I forget who the vendor is now, but their shelves are sealed with a door
which, when opened, turns off all the lasers on the shelf so you can
work on it, yes, a simple provisioning operation causes an outage /
protection switchover!!
Dave.
Deepak Jain wrote:
> At what power level do DWDM systems become dangerous to work near (i.e. not staring into any optics, using light meters, etc)? I never see technicians on inside DWDM systems using eye protection, but I see power levels of amps going higher and higher. On a recent meter I saw almost .6mW...
>
> Any pointers to a document saying 1550nm becomes dangerous at xxxx dbM?
>
> Thanks in advance,
>
> DJ
>
