[c-nsp] Good 10GE Metro switch

[sthaug at nethelp.no]

> Turns out the fiber length is about 60km, but it is testing at 13dB for 
> 1550 nm. This winds up fitting in the 24dB optical budget for the 
> XENPAK-10GB-ZR (80 km). I have removed  dB for connectors and potential 
> splices as well.
> 
> Next challenge: On the other end of the connection is a Juniper MX. So 
> here we go again ...

You should be just fine with a 10-GBASE-Z (80 km) XFP on the Juniper MX.
See for instance Table 3 on this page:

  http://www.juniper.net/techpubs/hardware/common/mx-series-dpc/4-port-10-gigabit-ethernet-dpc-with-xfp.html#mx-series-dpc-4xge-xfp

Steinar Haug, Nethelp consulting, sthaug at nethelp.no