30 Aug '14, 3am

#Tech The very short reach of 25 Gb/s signal transfer #100GBE @EDNCom #EyeOnStds

specification for 100 Gb/s Ethernet (100 GbE) over two years ago. It comes in 10x10 Gb/s and 4x25Gb/s varieties, but there is a big hole. The 10x10 flavor has specs for both electrical and optical connections, but the 4x25 only has optical specs. The hole isn’t so much in how to transport four separate differential lanes at 25 Gb/s, it’s how do you get data from the Serdes to the transceiver – or, in the language of OIF-CEI (Optical Internetworking Forum’s Common Electrical Interface committee) – host-to-module. OIF-CEI has been working on a VSR (very short reach) IA (implementation agreement, which OIF-CEI’s version of a spec) to plug that hole. Remember, OIF-CEI doesn’t officially target a given technology the way that 802.3 targets Ethernet. The IA provides compliance agreements, like a standard, to assure interoperability. OIF-28G-VSR has not been published but it will...

Full article: http://www.edn.com/electronics-blogs/other/4395136/The-ve...

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