There are some issues regarding jitter that need resolution. For 6G, we set the transmitter TJ at .6 UI as the delivered allowed jitter after the reference channel and receiver equalization. Previous speeds allowed 0.55 UI at IR/CR and then a receiver tolerance requirement with the 0.1 added sinusoidal jitter for receiver of 0.65 at IR/CR. This value allows the receiver to apply whatever its recovery capabilities are, including possible equalization schemes, to the signal to help to meet BER. Since we have moved to a point past the receiver equalization in the 6G specification, I am not convinced that the receiver tolerance methodology should be applied in the 6G specification. Comments?

Alvin Cox
Seagate Technology, LLC
Office 405-381-8067
Cell 405-206-4809
E-Mail  alvin.cox@seagate.com