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Rev. 2.0.0 | © 2019 Dallmeier | www.dallmeier.com
DDF5(X)50HDV-DN-SM Commissioning
NOTICE
Damage to the contacts of the RJ45 connectors when un-mating
the jack-plug connection under PoE load
Un-mating the jack-plug connection while transmitting PoE power
causes erosion and pitting by electrical arcs on both the jack and
plug contacts (especially when repeatedly un-mating the jack-plug
connection under PoE load). Electrical arcs are generated, since the
electric potential difference (voltage) and therefore the intensity
of the electric field between the contacts rises sharply when un-
mating the jack-plug connection.
The more un-mating cycles are carried out under PoE load, the
higher the loss of contact material due to metal evaporation by
electrical arcs, which in turn accelerates the material erosion pro-
cess on the contact surfaces.
Damaged contacts with an increased contact resistance may lead
to a reduced data transfer rate, unreliable network connectivity or
even total device failure.
➡
Always disable PoE on the relevant port of your PoE switch (or
PoE midspan device) or disconnect the used single-port PoE
injector from the power supply before un-mating the jack-plug
connection in order to prevent damage to the contacts of the
RJ45 connectors by contact erosion.
