[802.3ae_Serial] XAUI update from Plenary
There are three remaining technical issues from the IEEE Plenary meeting
this past week that must be resolved by vote at the September Interim.
1. Differential return loss at the driver
Credible simulation results confirm what many have suspected, that the 10 dB
return loss limit at the driver is impractical. We need measured data
showing how much relaxation is needed for practical implementations, and
solid information concerning how much relaxation is possible without
breaking the link integrity in the presence of connectors.
2. Common mode return loss at the receiver
One participant proposed that the common mode return loss be unspecified at
the receiver to eliminate the need for common mode termination. Information
on the impact to XAUI system performance is needed to determine if this is
possible.
3. Random jitter limit.
If deterministic jitter is very low, the present draft allows random jitter
to take up almost the entire jitter budget. It was argued and agreed that
this is not practical or desirable, and that random jitter should have a
maximum limit (like deterministic jitter does) to ease compliance
requirements on the receiver. Information on the maximum random jitter that
can be seen in practice is needed to establish a practical limit.
The Plenary summary for XAUI is posted at
http://grouper.ieee.org/groups/802/3/ae/public/jul01/kesling_2_0701.pdf.
Thank you to all participants!
-Dawson