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

[Mikael Abrahamsson]

On Tue, 28 Aug 2012, Phil Mayers wrote:

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

The B1/B2/B3 parity counters are useful even over dark fibre as it'll tell 
you if you're getting bit errors, even though that bit error didn't hit 
any actual packet.

So it's useful for verifying link quality even before putting live traffic 
on it.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se