[c-nsp] power requirement for WS-X614E-GE-45AT in reverse POE mode

Job Snijders job at instituut.net
Wed Apr 1 09:25:42 EDT 2015


On Wed, Apr 01, 2015 at 02:18:28PM +0100, Nick Hilliard wrote:
> On 01/04/2015 14:04, Łukasz Bromirski wrote:
> > PoE over fibre? Nah, you must have had misunderstood the specs.
> 
> actually the theory is sound.  They're injecting at +70dBm per strand,
> which gives about 18kW power-over-fibre output per pair.  Some of the staff
> members have been complaining that their remaining eye sockets are at risk,
> but tbh that particular data centre was never too hot on fibre hygiene
> anyway.  No matter how often you tell people not to look directly into
> fibre to see if it's been lit, there's always someone who knows better, sigh.
> 
> As an added advantage, the B end of these PoF links are great for burning
> out jammed cage nuts.

Yeah its legit. A Dutch ISP announced today they will start supplying
electricity over the spare fiber strand of their FTTH deployment as a
competitive alternative to the traditional grid. 

https://www.tweak.nl/nieuws/tweak-introduceert-elektriciteit-via-glasvezel.html
(use google translate if necessary)


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