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Ethernet's 400-Gigabit Challenge Is a Good Problem To Have
alphadogg writes "As it embarks on what's likely to be a long journey to its next big increase in speed, Ethernet is in some ways a victim of its own success. Years ago, birthing a new generation of Ethernet was relatively straightforward: Enterprises wanted faster LANs, vendors figured out ways to achieve that throughput and hashed out a standard, and IT shops bought the speed boost with their next computers and switches. Now it's more complicated, with carriers, Web 2.0 giants, cloud providers, and enterprises all looking for different speeds and interfaces, some more urgently than others. ... That's what the IEEE 802.3 400Gbps Study Group faces as it tries to write the next chapter in Ethernet's history. ... 'You have a lot of different people coming in to the study group,' said John D'Ambrosia, the group's chair, in an interview at the Ethernet Alliance's Technology Exploration Forum in Santa Clara, California, on Tuesday. That can make it harder to reach consensus, with 75 percent approval required to ratify a standard, he said."
The problem isn't that you have a bunch of squabbling engineers who can't even figure out how to split a lunch check. It's that you have a bunch of executives and attorneys that want to get as much of their company's IP piled into the standard as possible.
But we already have 10, 40 and 100gbps cables. Why 400x1?
Because interface bonding is like herding CATs.
Ezekiel 23:20
The problem is that different users have different requirements: Some will want low power requirements but don't need much range. Some will want more range but don't care much about power consumption and cost of advanced signal processing. Up to 1Gbps, Ethernet was a one-size-fits-all standard, mostly because everyone needed roughly the same: cheap, fast and uses existing cabling as much as possible (implying roughly the same range). Technological advances didn't require the kinds of tradeoff that are necessary now. From 10Gbps onward, Ethernet users have become more diverse and the technical challenges have forced more tradeoffs.
Nobody is really even doing 10gigE over cat5 (incl 6,7,8) for more than tiny patch cables. Fiber is fairly cheap.
Your sort of right, but completely wrong. The majority of the 10G ports previously sold are SFP based, but with 10G optical SFPs running ~$80 the vast majority of those ports have direct attach copper cables (CU/CR/CX1/ whatever you want to call it).
Because of this, the growth direction seems to be towards 10Gbase-T which can do 100 meters over cat6A driving the per port costs down significantly over SFP based solutions. Frankly, with the 10G uptake as a server interconnect, 40G is a good "low cost" switch interconnect/long haul medium. Again killing the need for 10G SFP solutions.