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The company’s “Zeptomux” bills itself as a “23-to-1 multiplexing switch that operates with a fibre-to-fibre latency (including SFP+s) of ~130ns.” The Zeptomux can achieve that speed over copper or fibre, and uses 10G Ethernet exclusively.Quite how the switch achieves that speed is, of course, a closely-guarded secret. But Zeptonics’ founder Matt Hurd told The Reg the company’s secret sauce “… is making a very constrained device.”“It’s not an ordinary switch,” he said. “It is stripped down and simplified. Client ports cannot talk to one another. We think it is the fastest way to multiplex Ethernet onto one outgoing layer two line.”