[802.3af] Classification currents range
- To: "'Donald S. Stewart'" <dsstewart@avaya.com>, "'R karam'" <rkaram@cisco.com>, "'Rick Brooks'" <ribrooks@nortelnetworks.com>, "'Schwartz, Peter'" <Peter.Schwartz@micrel.com>, "'Dave Dwelley'" <ddwelley@linear.com>, "'Lynch, Brian'" <brian_lynch@ti.com>, "'bruce.inn@micrel.com'" <bruce.inn@micrel.com>, "'Steve Carlson'" <scarlson@hspdesign.com>, "'AvinoamL@powerdsineusa.com'" <AvinoamL@powerdsineusa.com>
- Subject: [802.3af] Classification currents range
- From: Yair Darshan <YairD@powerdsine.com>
- Date: Tue, 21 Aug 2001 19:27:10 +0200
- Cc: "'stds-802-3-pwrviamdi@ieee.org'" <stds-802-3-pwrviamdi@ieee.org>
- Sender: owner-stds-802-3-pwrviamdi@majordomo.ieee.org
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 46: 10mA to 49mA
Table 7 page 17 line 5: 0.5mA to 13mA
Table 7 page 17 line 7: 10mA 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 49mA: 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
> 1 Hanagar St., P.O. Box 7220
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> Hod Hasharon 45421, Israel
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