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krisi
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Re: 56G serdes? 802.3bj panel?
krisi   2/7/2014 10:59:21 AM
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Have fun at OFC then, used to go to that trade show...and yes, I rememebr John D/Ambrosia starting 100G efforts 10 years ago...I am just curious what is teh state-of-the-art of this technlogy, used to be very power hungry...if anyone else is interested in giving a talk on this topic feel free to ping me...Kris

MeasurementBlues
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Re: 56G serdes? 802.3bj panel?
MeasurementBlues   2/7/2014 10:53:40 AM
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Grenoble and Vancouver are unlikely, but I will be in San Francisco in a few weeks for OFC. 100G has been around there for years. See http://edn.com/electronics-news/4380966/100-Gbps-Ethernet-In-demand-now from 2008.

krisi
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Re: 56G serdes? 802.3bj panel?
krisi   2/7/2014 10:48:58 AM
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thank you @MeasurementsBlues...I am surprised there is no FEC...what kind of Bit Error Rates (BER) do people achieve without it? Kris

krisi
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Re: 56G serdes? 802.3bj panel?
krisi   2/7/2014 10:46:47 AM
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I think he does! You are clearly the winner...I will buy you few beers as well if you could come to Grenoble or Vancouver conference (www.cmosetr.com) and talk about 100G challenges...Kris

MeasurementBlues
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Re: 56G serdes? 802.3bj panel?
MeasurementBlues   2/7/2014 10:37:42 AM
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@krisi, does Rick Merritt owe me a beer?

MeasurementBlues
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Re: 56G serdes? 802.3bj panel?
MeasurementBlues   2/7/2014 10:36:05 AM
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@krisi, most of those data streams use 66b/64b encoding and some may use 128b/127b. There was a lot of talk about using forward error correction, particularly where these serial buses might carry data-storage protocols. For example, SATA protocols riding on PCI3 GEN 3 physical layer.

See Exercise those storage devices for more.

krisi
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Re: 56G serdes? 802.3bj panel?
krisi   2/7/2014 10:25:44 AM
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thank you Martin...28 Gb/s it is...what kind of errror correction is used that is responsible for the extra 3 Gb/s?...Kris

MeasurementBlues
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Re: 56G serdes? 802.3bj panel?
MeasurementBlues   2/6/2014 10:39:08 PM
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I just posted an article about characterizing a 28Gb/s channel and how to de-embed the losses from the channel to get a clean measurement of the signal at the receiver.

DesignCon paper and tutorial explain de-embedding

 

MeasurementBlues
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Re: 56G serdes? 802.3bj panel?
MeasurementBlues   2/6/2014 10:37:06 PM
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100G Started as 1x10G and now is 2x25G. Well, 4x28G because of bit overhead. Most of the talk at DesignCon is per lane rather than aggregate. The major issue with aggregating is channel-to-channel crosstalk. Most of the issues are just simple getting 26G and 32G to run reliably, All kinds of issues come up such as insertion loss, reflections, intersymbol interference, and skew. At these speeds, differential pairs mismatched by even 1mm have skew prodlems.

rick merritt
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Re: 56G serdes? 802.3bj panel?
rick merritt   2/4/2014 2:54:50 AM
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@Kris: A good question: what was the highrest bandwidth per pin shown at DesignCon. A beer for whomever can answer that one!

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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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