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[802.3_ISAAC] Summary of this morning's channel and return loss ad hoc

All – for those who were unable to attend, we held the first channel and return loss ad hoc this morning.  Surprisingly, there seemed to be less consensus than the rather close presentations from July on insertion loss would suggest.  There was significant discussion on insertion loss and topologies, with consensus to focus initially on the coax link segment.  Beyond that, there was significant discussion about just what the ‘15m objective’ meant, what topologies to consider (e.g., how much flexible cable), and whether 15m was met only on new cable or whether that would included aging and temperature.  There was not significant discussion of return loss, noise, or other impairments.  The next ad hoc will be held on August 14, 7-9am pacific, chaired by Natalie Wienckowski.  I urge you to continue the discussions on the reflector in the meantime.  I have forwarded draft minutes, the agenda, and the presentation reviewed today to Jon for posting. 

 

Meanwhile, below, find the questions we generated for future presentations (thank you, Natalie):

 

From what point to what point do we need to define?  Link segment only, include MDI, include PCB limits?

 

Do we want to define separate differential and single ended requirements?  Focus on Coax first.

 

How much of the coax cable needs to be the flexible cable?  Percentage of total length, max number of meters regardless of total length, etc.

 

A better understanding of coax cable connector reflections and current limit lines in other organizations is needed.

 

More discussion is needed on noise models.

 

Is 15m with 4 in-lines the cable over the lifetime of the cable over the specified operating conditions, or are the limits based on the new cable only?

 

 

-george

 

 

George Zimmerman, Ph.D.

President & Principal

CME Consulting, Inc.

Experts in Advanced PHYsical Communications

george@xxxxxxxxxxxxxxxxxxxx

310-920-3860

 

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