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I'll at this input to the list of issues that we need to discuss.
The easy way to accommodate with this situation is to add 120/130mOhm or the relevant number to equalize the imbalance if it will cause not meeting the channel resistance unbalance spec which is TBD now.
Why you believe that fast Ethernet doesn't use magnetics? What are the frequencies of the fast Ethernet?
From: Lennart Yseboodt [mailto:lennartyseboodt@xxxxxxxxx]
Sent: Friday, February 14, 2014 11:27 PM
Subject: Re: [802.3_4PPOE] Update - 4P-PoE End to End System Imbalance (Channel Pair To Pair Resistance Imbalance) Ad-Hoc Chair. - With the attachment now
The worst case numbers on page 7 list for the transformer winding resistance a range of 120mOhm to 130mOhm.
Considering Fast Ethernet devices or switches that do not implement transformers on the spare pairs the range should be 0 Ohm to 130mOhm.
On Fri, Feb 14, 2014 at 10:10 PM, Darshan, Yair <YDarshan@xxxxxxxxxxxxx> wrote:
Please see attached the ad-hoc material for the meeting on Monday. Feb 17, 2014.
Comments and inputs are welcome.
4P-PoE End to End System Imbalance (Channel Pair To Pair Resistance Imbalance) Ad-Hoc Chair.
Chief R&D Engineer
Analog Mixed Signal Group
1 Hanagar St., P.O. Box 7220
Neve Ne'eman Industrial Zone
Hod Hasharon 45421, Israel