RE: [802.3af] RE: Classification currents range
- To: "'Stewart, Donald S (Don)'" <dsstewart@xxxxxxxxx>, Yair Darshan <YairD@xxxxxxxxxxxxxx>
- Subject: RE: [802.3af] RE: Classification currents range
- From: Yair Darshan <YairD@xxxxxxxxxxxxxx>
- Date: Wed, 22 Aug 2001 15:10:45 +0200
- Cc: stds-802-3-pwrviamdi@xxxxxxxx, R karam <rkaram@xxxxxxxxx>, Rick Brooks <ribrooks@xxxxxxxxxxxxxxxxxx>, "Schwartz, Peter" <Peter.Schwartz@xxxxxxxxxx>, Dave Dwelley <ddwelley@xxxxxxxxxx>, "Lynch, Brian" <brian_lynch@xxxxxx>, bruce.inn@xxxxxxxxxx, Steve Carlson <scarlson@xxxxxxxxxxxxx>, AvinoamL@xxxxxxxxxxxxxxxxx
- Sender: owner-stds-802-3-pwrviamdi@xxxxxxxxxxxxxxxxxx
Don,
Thanks for your comments and I have updated my proposal accordingly.
The reason for the small changes in the current values was to increase the
gaps between the classes to decrease to minimum the chance for accuracy
and resolution problems.
Attached below the proposal updated with your comments.
Thanks
Yair.
Table 7 page 16 lines 25-39:
Class1 8 - 10 ma
Class2 13 - 16 ma
Class3 19 - 23 ma
Class4 27 - 33 ma
Class5 37 - 45 ma
Table 7 page 16 lines 41: 1mA to 49mA
Table 7 page 16 lines 44: 0.5mA to 8mA
Table 7 page 16 lines 46: 10mA to 49mA
Table 7 page 17 line 5: 0.5mA to 13mA
Table 7 page 17 line 7: 16mA to 49mA
Table 7 page 17 line 9: 0.5mA to 19mA
Table 7 page 17 line 11: 23mA to 49mA
Table 7 page 17 line 13: 0.5mA to 27mA
Table 7 page 17 line 15: 33mA to 49mA
Table 7 page 17 line 17: 0.5mA to 37mA
Table 7 page 17 line 18: 45mA to 49mA
According to the above, table 3 should be changed to:
(Measured current method)
Class 1: 6.5mA to 11.5mA
Class 2: 11.5mA to 17.5mA
Class 3: 17.5mA to 25mA
Class 4: 25mA to 35mA
Class 5: 35mA to 47mA
Greater than 48mA: Invalid result, not a PD.
And table 4:(measured voltage method)
Class 1: 5mA - 8mA V< 15V
10mA-13mA V>20V
Class 2: 10mA - 13mA V< 15V
16mA-19mA V>20V
Class 3: 16mA - 19mA V< 15V
23mA-27mA V>20V
Class 4: 23mA - 27mA V< 15V
33mA-37mA V>20V
Class 5: 33mA - 37mA V< 15V
45mA - 50mA V>20V
> -----Original Message-----
> From: Stewart, Donald S (Don) [SMTP:dsstewart@xxxxxxxxx]
> Sent: в, аевеси 21, 2001 9:26 PM
> To: Yair Darshan
> Cc: stds-802-3-pwrviamdi@xxxxxxxx; R karam; Rick Brooks; Schwartz,
> Peter; Dave Dwelley; Lynch, Brian; bruce.inn@xxxxxxxxxx; Steve Carlson;
> AvinoamL@xxxxxxxxxxxxxxxxx; Stewart, Donald S (Don)
> Subject: [802.3af] RE: Classification currents range
>
> Yair,
> I assume you retracted the first mail with this Subject but you expect a
> reply to this one.
>
> I have no objection to the slight "streaching" that you propose provided
> it it truly needed. Can anyone else support the need? Any problems
> introduced by the slightly higher currents?
>
> We "voted in" the present values at some level. But that should not block
> this change if needed.
>
> A couple of "typos" to consider changing in your proposal:
>
> 1.) You did not change page 16, line 44. I believe you'd want to also
> change to "0.5 mA to 8 mA".
>
> 2.) Your page 17, line 7 proposed chnage was "10 mA to 49 mA". I believe
> you mean "16 mA to 49 mA".
>
> 3.) You suggest Table 3 changes for "Class 5: 25 mA to 47 mA", and suggest
> "greater thna 49 mA being the invalid result". This leaves 47 to 48 mA
> undefined. This is perhaps OK but we might use "25 mA to 48 mA, with > 48
> mA being the invalid result" and avoid this undefined window.
>
> Don
>
>
> -----Original Message-----
> From: Yair Darshan [ <mailto:YairD@xxxxxxxxxxxxxx>]
> Sent: Tuesday, August 21, 2001 1:27 PM
> To: Stewart, Donald S (Don); 'R karam'; 'Rick Brooks'; 'Schwartz,
> Peter'; 'Dave Dwelley'; 'Lynch, Brian'; 'bruce.inn@xxxxxxxxxx'; 'Steve
> Carlson'; 'AvinoamL@xxxxxxxxxxxxxxxxx'
> Cc: 'stds-802-3-pwrviamdi@xxxxxxxx'
> Subject: Classification currents range
>
>
> Guys,
>
> It seems that the gaps between currents specified for various classes
> of PDs during the classification procedure are too small and may produce
> a measurement accuracy issue.
>
> I am suggesting to change in the draft the numbers as described below:
>
> Table 7 page 16 lines 25-39:
>
> Class1 8 - 10 ma
> Class2 13 - 16 ma
> Class3 19 - 23 ma
> Class4 27 - 33 ma
> Class5 37 - 45 ma
>
> Table 7 page 16 lines 41: 1mA to 49mA
> Table 7 page 16 lines 44: 0.5mA to 8mA
> Table 7 page 16 lines 46: 10mA to 49mA
>
> Table 7 page 17 line 5: 0.5mA to 13mA
> Table 7 page 17 line 7: 16mA to 49mA
> Table 7 page 17 line 9: 0.5mA to 19mA
> Table 7 page 17 line 11: 23mA to 49mA
> Table 7 page 17 line 13: 0.5mA to 27mA
> Table 7 page 17 line 15: 33mA to 49mA
> Table 7 page 17 line 17: 0.5mA to 37mA
> Table 7 page 17 line 18: 45mA to 49mA
>
> According to the above, table 3 should be changed to:
> (Measured current method)
>
> Class 1: 6.5mA to 11.5mA
> Class 2: 11.5mA to 17.5mA
> Class 3: 17.5mA to 25mA
> Class 4: 25mA to 35mA
> Class 5: 35mA to 47mA
>
> Greater than 48mA: Invalid result, not a PD.
>
> And table 4:(measured voltage method)
>
> Class 1: 5mA - 8mA V< 15V
> 10mA-13mA V>20V
> Class 2: 10mA - 13mA V< 15V
> 16mA-19mA V>20V
> Class 3: 16mA - 19mA V< 15V
> 23mA-27mA V>20V
> Class 4: 23mA - 27mA V< 15V
> 33mA-37mA V>20V
> Class 5: 33mA - 37mA V< 15V
> 45mA - 50mA V>20V
>
> Comments?
>
> Yair.
>
>
> Darshan Yair
> Chief Engineer
> > PowerDsine Ltd. - Powering Converged Networks
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