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Most if not all of the Midspans I have looked
at disconnect the spare from the input and pass the data pair directly through.
This will work. Even Gigabit Midspans have DC blocking
caps to prevent the power going back to the switch. Conclusion is that Midspan will always
take priority for powering. An endspan does not detect through a
Midspan pair that is providing power but does for a pair that does not get
power. In any implementations, endspan or Midspan
with DS, the PD needs to handle receive power with undefined time gap between
pairs. DS works! From:
owner-stds-802-3-poep@xxxxxxxx [mailto:owner-stds-802-3-poep@xxxxxxxx] On Behalf Of Guys, Here is another update, in case we want to
go over it at the classification adhoc tomorrow morning. I made quite a
few improvements. Steve |