[c-nsp] Upgrading to 40G

Peter Lothberg roll at Stupi.SE
Fri Feb 28 03:43:32 EST 2014

> At this stage we wouldn't be able to justify the spend to go 100G on
> ASR9k. We're not talking about a single router or interface here, but
> quite a few. 

Are you counting $$ or DS0's?

> Besides - that doesn't really answer the question what to
> do with distances over the 10km.

Ehh? It's plug-and play 80 chanels up to some 800km. At 1000km you
will need some more clever amp then something from alibababa for $800.  

You have -3dBm out, need -18dBm on receiver side.  If you only need
one chanel, waste 3db on connectors, 3db margin and you can have 
50km of SMF28.


> On 28 February 2014 13:06, Peter Lothberg <roll at stupi.se> wrote:
> >> We just started planning to upgrade our 10G (and nx10G) links to 40G
> >> (on ASR9k). Quick scan through Cisco website revealed that there are
> >> no 40km optics available from Cisco. That threw a big spanner into the
> >> works as we have a bunch of links definitely over LR budgets.
> >>
> >> So the question is - how do you do 40G in metro areas? Deploy some
> >> sort of amplifiers? Go through DWDM or OTN devices?
> >
> >
> > Why 40? Do 100G coherent instead, you can build the whole optical
> > system out of splitters as we did in Croatia..
> >
> > Ask for line_cards with optics that conforms to this spec...
> >
> > http://www.stupi.se/Standards/100G-long-haul4.pdf and you can mix and
> > match vendors...

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