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_da... Vince
Frank
-----Original Message----- From: Richard A Steenbergen [mailto:ras@e-gerbil.net] Sent: Thursday, February 17, 2011 7:00 PM To: Jason Lixfeld Cc: nanog@nanog.org Subject: Re: SFP vs. SFP+
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
On Thu, Feb 17, 2011 at 03:41:28PM -0800, Sam Chesluk wrote: 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.