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[802.3_NGAUTO] transmit jitter text

All – Ramin Farjadrad would like to propose the following text for transmit jitter (I’m just forwarding)



149.5.1 Test Modes

Modify Test Mode 2 as follows

Test mode 2: Transmit MDI Jitter in Master Mode

Test mode 2 is for transmitter jitter testing on MDI when transmitter is in MASTER timing mode. When test mode 2 is enabled, the PHY shall transmit a continuous pattern of JP03A (as specified in Clause or JP03B (as specified in Clause with the transmitted symbols timed from its local clock source. Transmit Timing Jitter

Add the following to Transmit Timing Jitter Transmit MDI Jitter in Master Mode  

Jitter measurements in this subclause are performed with transmitter is enabled in Master timing mode with a local clock. To Measure Random Jitter in RMS (RJrms) and Deterministic Jitter (DJ) followsteps as specified in Clause, with following modifications:

fn =1MHz x s, T  = 68ns/s       (where s=1 @10G, s=0.5 @5G, s=0.25 @2.5G)


And for Even-odd jitter (EOJ) measurement follow steps as specified in Clause          


The calculated transmit timing jitters for RJrms, DJ, and EOJ from above measurements should be:

            RJrms = 1ps/s,  DJ = 9ps/s,      EOJ = 4ps/ s     (where s=1 @10G, s=0.5 @5G, s=0.25 @2.5G)




George A. Zimmerman, Ph.D.

President & Principal Consultant

CME Consulting, Inc.

Experts in PHYsical Layer Communications




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