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Re: [802.3_4PPOE] Comment #51 - TDL #129 Part A- Rounding resistor values in Table 145-17 to 1%

Hi Yair,

Your editing instruction says "Change Table 145-17 as is".

That puts the editor in a really awkward position... do I change it ? Do I change it and change it back ?

On a more serious note, I would find it very unlikely anyone is going to bother testing unbalance with resistances precise down to the milliohm range.

Considering that resistors have a temperature coefficient that completely blasts the 1% precision away when exposed to the amount of current needed to test unbalance.

I would suggest the following roundings which actually make the range a bit wider:

0.087 => 0.08

0.101 => 0.1

5.41 => 5.4

6.25 => 6.3

Also, rounding RCH_unb_min/max but not rounding Rpd_min/max produces no net gain.

After all, the requirement is on the SUM of those resistances.

We also need to round Rpd_min and max.

Finally, Table 145-17 says "All resistances within 1% range" should say "+/- 1% range".

Kind regards,


From: Yair Darshan <YDarshan@xxxxxxxxxxxxx>
Sent: Tuesday, May 16, 2017 15:41
To: STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Subject: [802.3_4PPOE] Comment #51 - TDL #129 Part A- Rounding resistor values in Table 145-17 to 1%

Hi guys,

Please see attached. Ill appreciate your review.




Darshan Yair

Chief R&D Engineer

Analog Mixed Signal Group

Microsemi Corporation


1 Hanagar St., P.O. Box 7220
Neve Ne'eman Industrial Zone
Hod Hasharon 45421, Israel
Tel:  +972-9-775-5100, EXT 210.

Cell: +972-54-4893019
Fax: +972-9-775-5111


E-mail: <mailto:ydarshan@xxxxxxxxxxxxx>.