So I've got this 2.5gig wave, what do I do with it?

Mon Apr 20 14:41:02 UTC 2009

On Fri, 17 Apr 2009 15:02:29 -0400
Eric Van Tol <eric at atlantech.net> wrote:

> > -----Original Message-----
> > From: Eric Van Tol [mailto:eric at atlantech.net]
> > Sent: Friday, April 17, 2009 2:44 PM
> > To: nanog at nanog.org
> > Subject: RE: So I've got this 2.5gig wave, what do I do with it?
> > 
> > > -----Original Message-----
> > > From: Kevin Hunt [mailto:khunt at huntbrothers.com]
> > > Sent: Friday, April 17, 2009 12:28 PM
> > > To: will at loopfree.net; nanog at nanog.org
> > > Subject: Re: So I've got this 2.5gig wave, what do I do with it?
> > >
> > 
> > > I haven't used MRV but they look appealing, would love to hear other
> > folks
> > > experience with them as I'm about to have to turn another two of these
> > > up...
> > >
> > > --
> > 
> > We use the MRV LamdaDrivers and they work well.  We use the EM2009-G2 on
> > our own dark fiber loops and provide dual GE connectivity on a single 2.5G
> > wavelength.  Equipment is pretty barebones, but quite solid.  Management
> > module can be rebooted without loss of light on any interfaces (besides
> > those terminated on the management module, of course).  There's plenty of
> > options for SFPs wrt distances.  However, since the OP is receiving a lit
> > signal from the carrier, I'm not entirely sure it will work in his case,
> > as I *believe* the trunk port requires a WDM SFP, not a standard
> > 850/1310/1550.  I could certainly be wrong, though.
> > 
> > -evt
> 
> Sorry to respond to my own post, but I was getting the EM2009-GM2 mixed up with another module we use.  We do use the EM2009-GM2, but it does not have an SFP trunk port - it's just a pair of SC connectors on the trunk side.  Looks like it can be configured for a specific wavelength by the setting of some jumpers on the module, and it looks like 1310 is possible.

http://www.undone.org.uk/em2009-gm2.jpg

The modules we have use SFPs for both Access & Trunk (WDM) ports.

The only jumpers on the boards, to my recollection, are to choose between Gigabit Ethernet
or Fibre Channel line protocol on the access ports. The trunk port protocol is mrv proprietary
at two-and-a-bit Gbit/sec (2x GigE + TDM overhead).

My understanding is that they'll support any sane choice of SFP (some MRV SFPs are clearly
NOT sane choices for this card, such as the digital video coax module..)

MRV SFP modules sold as multirate or OC48 types can be used for the trunk port. We have some
of these cards running with "normal" 1310nm SFPs in the trunk ports where we only require
two Gbit services over a single fibre pair.

I can't comment on interop with other carriers' systems - we only use these on end-to-end
dark fibre.

MRV may able to advise whether or not their trunk protocol is likely to pass through
transponders (which may well try to reshape/retime) designed to transport SONET/SDH.

d.