Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

20 ppm clock tolerance for WIS




Gary, Howard:
	For the benefit of those who could not make it to your presentation in 
Ottawa,  could you clarify some of the issues that you raise.
http://grouper.ieee.org/groups/802/3/ae/public/may00/nicholl_1_0500.pdf

You mention that the "cost difference between +/-20ppm and +/-100ppm 
oscillators is a tiny fraction of the total cost of a 10GigE  interface".
Could you perhaps substantiate this statement with quantitative input (some 
real numbers).  My understanding is that the +-100ppm tolerance was 
specified only to keep the cost down (as the cost differential between a 
20ppm solution and 100ppm solution is perceived to be significant).

You recommend using "LAN PHY jitter specs".  This makes the WIS 
incompatible with installed base SONET . This doesn't seem to meet your 
goal of being compatible with installed OC-192 SONET 
infrastructure.  Please clarify.

-Praveen