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Re: [802.3_10SPE] Test modes in clause 147.5.1

Venkat – on the second issue, I think it is perfectly reasonable to use the same scrambler for test mode 3 that we use for the data.  No need for an extra scrambler just for test.  I would suggest you submit a comment on that in the next round, or the initial working group ballot round (probably best) after the dust has settled on the other scrambler.


As far as the other test modes are concerned, I think you need all 4 tests:

Test 1 is for output voltage & timing jitter – basic ethernet PHY specs that we still have

Test 2 is for droop – we need some kind of test for the low frequency highpass coupling of the transmitter. (PSD masks don’t work well for this)  whether it is specified right for our DME system, I’ll leave to people to debate.

Test 3 is for the PSD mask – we should probably delete the “transmitter distortion” part of the name (we can do that as a late comment or next round, even if we go to working group ballot – it’s a simple editorial)

Test 4 is for the high impedance mode – we just added that specifically for PHYs with multidrop capability.



George A. Zimmerman, Ph.D.

President & Principal Consultant

CME Consulting, Inc.

Experts in PHYsical Layer Communications




From: Venkat Iyer [mailto:Venkat.Iyer@xxxxxxxxxxxxx]
Sent: Friday, May 04, 2018 10:49 AM
To: STDS-802-3-10SPE@xxxxxxxxxxxxxxxxx
Subject: [802.3_10SPE] Test modes in clause 147.5.1



Since the T1S PMA uses DME, I was wondering if we need all three of the Test modes 1,2 and 3.

Also, if we add a scrambler in PCS (as discussed in the ad hoc meetings), could we use that for test mode 3  instead of  the PRBS7? 


Venkat  Iyer


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