Re: [802.3_4PPOE] 57V
Lennart - that is simple and works for me to describe the voltages. The 'between' I think is important, as it fixes your issue, and the 'any combination' works to both hit all the polarity issues.
I think we need to add the 'without permanent damage' to the end to keep the same meaning, giving:
Type 3 and Type 4 PDs shall withstand any voltage between 0 and 57V between any combination and any number of pairs without permanent damage.
Does that work for people on the Type 3/4, or do we need the additional statement:
'The requirement above does not apply to voltage between the two conductors of a twisted pair.
George Zimmerman
Principal, CME Consulting
Experts in Advanced PHYsical Communications Technology
george@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
310-920-3860
(PLEASE NOTE NEW EMAIL ADDRESS. THE OTHER WILL STILL WORK, BUT PLEASE USE THIS FOR CME BUSINESS)
-----Original Message-----
From: Yseboodt, Lennart [mailto:lennart.yseboodt@xxxxxxxxxxx]
Sent: Wednesday, July 15, 2015 10:28 PM
To: George Zimmerman; STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Subject: RE: [802.3_4PPOE] 57V
The "-57V to 57V" can be read as requiring 114V must be tolerated.
My attempt:
Type 3 and Type 4 PDs shall withstand any voltage between 0 and 57V between any combination and any number of pairs.
Kind regards,
Lennart
________________________________________
From: George Zimmerman [george@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Thursday, July 16, 2015 10:14
To: STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_4PPOE] 57V
I agree that we don't want to remove the ambiguity in the existing text. I like, however the -57 to 57 v rather than 0 to 57 v at any polarity.
I don't think we should be writing it in terms of tests, but rather use the pin sets defined in the table, as Dan suggests.
This leaves me with Dans text, just without the 'on either mode a or mode b'
George Zimmerman
CME Consulting, Inc.
310-920-3860
George@cmeconsulting.onmicrosoft,com
On Jul 15, 2015, at 10:06 PM, Dave Dwelley <ddwelley@xxxxxxxxxx> wrote:
Dan -
I'd prefer:
"Type 1 and Type 2 PDs shall withstand any voltage from 0V to 57V at the PI indefinitely without permanent damage.
Type 3 and Type 4 PDs shall withstand any voltage or combination of voltages from 0V to 57V across any combination of Mode A and Mode B conductor pairs (defined in Table 33-13) indefinitely without permanent damage.
These tests shall be run with the two conductors of each tested pair tied together."
This preserves the ambiguous text from AT for Types 1 and 2 while making Types 3 and 4 clear and stopping the across-a-pair problem.
Dave