[c-nsp] WAN PHY and OTN(G.709) modes

Phil Mayers p.mayers at imperial.ac.uk
Tue Aug 28 10:43:00 EDT 2012

On 28/08/12 15:18, Adam Vitkovsky wrote:
> Is there any added value in running WAN PHY or OTN(G.709) modes on
> interfaces connected over a dark fiber please?

OTN will give you ~6dB "headroom" due to the FEC. Of course, by the time 
you've paid your vendor a hojillion dollars for the license, you might 
wish you'd just use ZR optics or an amplifier...

WAN PHY is only useful if you need to run over SDH, so not useful over 
dark fibre, as far as I can see.

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