IEEE P802.3bz Approval for 2.5G/5G Ethernet

Re:IEEE P802.3bz Approval for 2.5G/5G Ethernet by stephengillie on Tuesday October 04, 2016 @12:16AM (#12633310)

How fast can data transmission over copper become? What is the limit of physics - just for wire transport, not the switching logic.

Essentially, I guess that is treating the wire as a capacitor, and asking how many times per second an ASIC can detect if it's at a positive (1) or negative (0) voltage - for LVDS at least.

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Re:IEEE P802.3bz Approval for 2.5G/5G Ethernet by j-walker on Tuesday October 04, 2016 @12:18PM (#12636614)

At last year's DesignCon there was a lot of talk about switching to PAM-4 encoding versus the now-standard NRZ. This would almost double the bandwidth given the same clock speed.

NRZ encoding means on a clock tick you either get a 1 or a 0. With PAM-4 a clock tick can be a 0,1,2,or 3.

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Re:IEEE P802.3bz Approval for 2.5G/5G Ethernet by stephengillie on Tuesday October 04, 2016 @03:16PM (#12638475)

This sounds similar to MLC in SSD. And both feel like a step back towards analog computing.

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Re:IEEE P802.3bz Approval for 2.5G/5G Ethernet by wmf on Tuesday October 04, 2016 @12:28AM (#12633343)

50 Gbps per lane has been demonstrated and should be commercially available in 2018. QSFP cables will be carrying 200 Gbps.

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Re:IEEE P802.3bz Approval for 2.5G/5G Ethernet by fulafel on Tuesday October 04, 2016 @12:28AM (#12633347)

Fiber is fine.

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