On Fri, 17 Apr 2009 15:02:29 -0400 Eric Van Tol <e...@atlantech.net> wrote:
> > -----Original Message----- > > From: Eric Van Tol [mailto:e...@atlantech.net] > > Sent: Friday, April 17, 2009 2:44 PM > > To: nanog@nanog.org > > Subject: RE: So I've got this 2.5gig wave, what do I do with it? > > > > > -----Original Message----- > > > From: Kevin Hunt [mailto:kh...@huntbrothers.com] > > > Sent: Friday, April 17, 2009 12:28 PM > > > To: w...@loopfree.net; nanog@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.
