On 18/02/2011 03:04, Frank Bulk wrote: > Are there are any optics that plug into 10G ports but have a copper or > optical 1G interface? There's some equipment that I'm specing where it is > $10K for a multi-port 1G card, even while I really may only *occasionally* > need a single 1G port and there's a free 10G port for me to use.
Some of the cisco stuff supports a twingig converter module, One tengig to 2 one gig (and from there a copper or optical SFP) http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps7077/product_data_sheet0900aecd805bbee3.html Vince > Frank > > -----Original Message----- > From: Richard A Steenbergen [mailto:r...@e-gerbil.net] > Sent: Thursday, February 17, 2011 7:00 PM > To: Jason Lixfeld > Cc: nanog@nanog.org > Subject: Re: SFP vs. SFP+ > > On Thu, Feb 17, 2011 at 03:41:28PM -0800, Sam Chesluk wrote: >> Depends on the switch. Some, like the 2960S and 4948E, have 1G/10G >> ports. They will, however, not operate at 4Gbps (that particular speed >> was chosen to allow the core components to work for gigabit Ethernet, >> OC48, 2G FC, and 4G FC). > 4G SFPs are relatively rare, and only for fibre channel. Multi-rate SFPs > that do up to 2.5G (for OC48) are a lot more common, but they cost more > than just a simple 1GE SFP. Since all you can do with Ethernet is 1G or > 10G anyways, "most" SFPs you'll encounter in the field will be the > cheaper non-multirate kind. > > For more information about SFP+, as well as some comparisons between > different 10G optic types, take a look at: > > http://www.nanog.org/meetings/nanog42/presentations/pluggables.pdf > > As an update (since this presentation is from Feb 2008), SFP+ is just > now finally starting to get into 40km/ER reach territory. Supplies are > limited, as they just very recently started shipping, but they do exist. > Of course since they moved the electronic dispersion compensation (EDC) > off the optic and onto the host board, the exact distances you'll be > able to achieve are still based on the quality of the device you're > plugging them into. SFP+ is still mostly an enterprise box or high > density / short reach offering, and XFP is still required for full > functionality. >
