The MIB module for for managing Powered Devices (PD) or
Power Source Equipment (PSE) working according to the IEEE
802.af Powered Ethernet (DTE Power via MDI) standard.
The following terms are used throughout this
MIB module.  For complete formal definitions,
the IEEE 802.3 standards should be consulted
wherever possible:

Group - A recommended, but optional, entity
defined by the IEEE 802.3 management standard,
in order to support a modular numbering scheme.
The classical example allows an implementor to
represent field-replaceable units as groups of
ports, with the port numbering matching the
modular hardware implementation.

Port - This entity identifies the port within the group
for which this entry contains information. The numbering
scheme for ports is implementation specific.