Black Box LPH240A-H, Operation Manual

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Chapter 2: Introduction
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The LPH240A switch ports follow an auto-sensing algorithm, so
that they provide power only to 802.3af, PoE end devices. PoE is
managed by a multi-stage handshake to protect equipment from damage
and to manage power budgets. The LPH240A ports will discontinue
supplying power when the PoE powered devices are disconnected (on
incorrect impedance value). LPH240A units support the 802.3af PoE
PSE standard for over-current protection, under-current detection, and
fault protection.
The LPH240A is an 802.3af standards-compliant way to power
and connect a few small Ethernet devices at the edge of a network where
AC power is not cost-effective to deploy. Since PoE is rapidly emerging
as an Ethernet option in industrial, commercial, outdoor, and military
applications, the LPH240A is enabling the efficient deployment of reliable
security cameras, VoIP and wireless access networking devices to
increase the efficiency of heavy-duty industrial communications.
Furthermore, using PoE switches like the LPH240A can produce
significant cost savings as well as flexibility and reliability over traditional
AC-powered devices. The simplicity of PoE increases reliability and
reduces the overall cost of installation and operation.