Thanks, using an external CWDM mux is an option we're explorering. Frank
-----Original Message----- From: Thomas Weible - FLEXOPTIX [mailto:thomas.wei...@flexoptix.net] Sent: Saturday, April 06, 2013 5:51 AM To: Matt Addison; Frank Bulk Cc: nanog@nanog.org Subject: AW: 80 km BiDi XFPs Matt Addison [mailto:matt.addi...@lists.evilgeni.us] wrote: > > How much spare margin do you have? Could you roll your own with a pair > of mismatched (C|D)WDM XFPs and a mux on each end? Typically you have 23dB powerbudget for the ZR (CWDM or DWDM) - maybe +2 dB through selection of TOSA. A CWDM Mux will take 2dB and a small DWDM Mux approx. 4dB - you need two of them. This will drag your overall link-powerbudget below 20dB. It might work if you add a FEC (either on the linecard or the XFP itself). This will add approx. 5dB to your powerbudget of 23dB. Take a CWDM Mux and fire x-crossed on 1550 and 1570 (maybe 1530) and you will face an attenuation of approx. 0,2 - 0,25dB/km. This could work and you should be able to transmit 80km to 90km. It's worth a test - also to figure out if dispersion will have an impact or not. Thomas > On Apr 2, 2013, at 19:16, Frank Bulk <frnk...@iname.com> wrote: > > > Is anyone aware of a reputable supplier of 80 km BiDi XFPs? My regular > > supplier of generics doesn't have an option for us, but I would really like > > to avoid leasing additional fibers. > > > > Frank > > > > > >
