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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 87.20-3.3%Nov 20 3:59 PM EST
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To: Jdaasoc who wrote (37779)3/4/2000 6:30:00 AM
From: John Walliker  Read Replies (1) of 93625
 
John,

Where are the hell are bilow, John W. and the rest of the ee's when you need them.

I'm still here!

I looked at the JAZZio presentation. It is hard to assess it at present because the presentation does not tell the complete story.

There is nothing new about non-return-to-zero signalling, which is used in many networking applications. It does have some significant advantages for long transmission distances because with the right protocols it can reduce the spread of frequencies and hence dispersion where some frequencies travel at different speeds from others. However, JAZZio does not as far as I can see place such a protocol on top of the signals.

I don't think that the signal integrity will be as good as Rambus, because the bus drivers are constant voltage rather than constant current. This means that when the length of the bus becomes longer than the duration of one bit there will be multiple devices turned on at the same time if the bus is to operate at maximum efficiency. An inevitable consequence of this is reflections between the multiple drivers when they are turned on. Rambus overcomes that problem by using constant current drivers that allow signal to pass through a "turned on" driver without being affected or reflected.

Hence as bus speeds scale up to many GHz the JAZZio scheme will have a hard bus length limit that Rambus will not be subject to.

John
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