[802.3af] Your TR Comment
Chad-
Please post your diagram to the reflector ASAP
Geoff
==============================================
There exists a scenario whereby two or more PDs with different power
mixing schemes,
when PSE-Midspan powered, may cause damage to a legacy 802.3 data switch
to which
the PDs are attached which may be sharing unused pair termination.
Chad to provide a drawing if necessary.
SuggestedRemedy
There are several ways to prevent this damage to legacy 802.3 equipment
(listed in order
of least desireable):
- 1. Disallow the Midspan PSE
- 2. Force environment B for Midspans
- 3. Define an environment B- that can address this mixed scenario
- 4. Mandate a full diode bridge on each power pair in the PD
- 5. Mandate a half diode bridge on each power pair in the PD
Proposed Response
Comment Status X
Response Status O
Jones, Chad Cisco Systems
|=========================================|
| Geoffrey O.
Thompson
|
| Vice Chair, IEEE
802
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