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Hello Everybody, I have a question about
the PSE Interface, Detection and Safety! In the actual IEEE
802.3af standard, 33.2.9 Power supply
allocation, the behaviour of connecting a PSE PI with another PSE PI
is not explained. See: 33.2.9 Power supply allocation A PSE shall not
initiate power provision to a link if the PSE is unable to provide the maximum
power level requested by the PD
based on the PD’s class. Where a PSE does not provide the optional
classification function specified in
33.2.7, all PDs are treated as Class 0. The PSE may manage
the allocation of power based on additional information beyond the
classification of the attached PD.
Allocating power based on additional information about the attached PD, and the
mechanism for obtaining that
additional information, is beyond the scope of this standard with the exception
that the allocation of
power shall not be based solely on the historical data of the power consumption
of the attached PD. If
the system implements a power allocation algorithm, no additional behavioral
requirement is placed on the
system as it approaches or reaches its maximum power subscription. Specifically,
the interaction between
one PSE PI and another PSE PI in the same system is beyond the scope of this
standard. In the industrial field, line
and ring topologies are very common, so my question is: Does the new IEEE 802.3at
standard explain this issue? What happens if I connect
two PSE PI’s together? Can anybody help me with
this question? Manny thanks! With best regards, mit freundlichen
Grüssen Pascal Unterdorfer Hirschmann Automation and Control GmbH Ê +49 7127 14-1561 Von:
owner-stds-802-3-poep@xxxxxxxx [mailto:owner-stds-802-3-poep@xxxxxxxx] Im Auftrag von McCormack, Michael Colleagues I would like to update everyone on the schedule for
our work.
We are down to the end, please remain focused so we
can complete. Cheers Mike Michael McCormack Business Development Manager, Power over Ethernet
Products
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