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docdivakar
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re: Broadcom rolls two-port 100G switch
docdivakar   4/30/2012 9:44:15 PM
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@markhahn: it is probably because IB has not been successful in penetrating the datacenter market and remains a niche for HPC clusters. Secondly, switches with CXP/QSFP interconnects have fabric extenders that support downstream 10Gig RJ-45, a great advantage for legacy installations that IB doesn't serve. MP Divakar

markhahn0
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re: Broadcom rolls two-port 100G switch
markhahn0   4/30/2012 6:54:54 PM
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hah, very droll! at two-port switch indeed! can the switch actually be configured to any use whose bandwidth sums to less than 240 Gb? such as 1x 100Gb and 14 10Gb? I personally have a hard time understanding the lassitude of the eth market - for those who actually care about latency and bandwidth, the IB world has been delivering 36-port 40 or 56Gb fabrics for quite a while. in what way does a mere 240Gb device "reset the market"?



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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