Specifications

BLACK BOX
®
White
with
5th black
diamond
10
Tech Support: 030-241 77 99 | Sales: 030-241 77 77
Industrial Solutions
Power over Ethernet
The seemingly universal network connection, twisted-pair
Ethernet cable, has another role to play, providing electrical
power to low-wattage electrical devices via Power over
Ethernet (PoE).
The original 802.3af PoE standard provides about 13 watts at
48 VDC over twisted-pair Ethernet cable to PoE-enabled devices
such as IP telephones, wireless access points, and IP cameras. The
newer 802.3at PoE standard supplies up to 25 watts to larger,
more power-hungry devices and is backwards compatible with
802.3af.
The way PoE works is simple. Copper Ethernet cable consists
of four twisted pairs of cable, and PoE sends power over these
pairs to PoE-enabled devices. In one method, two wire pairs are
used to transmit data, and the remaining two pairs are used for
power. Or power and data may be sent over the same pair—
power and data transmissions don’t interfere with each other
because electricity and data function at opposite ends of the
frequency spectrum, they can travel over the same cable.
Electricity has a low frequency of 60 Hz or less, and data
transmissions have frequencies that can range from 10 million
to 100 million Hz.
There are two types of devices involved in PoE configurations:
Power Sourcing Equipment (PSE), which provide power over an
Ethernet cable, and Powered Devices (PD), which receive power
over an Ethernet cable.
Use your network for routine monitoring and surveillance.
Ethernet is turning up in some unexpected places — parking garages, convenience stores, dairy barns, and fire
stations, to name just a few. It’s become a universal connectivity solution, not just for PCs, but for a variety of systems
that have little to do with what we think of as traditional computer applications — systems such as surveillance
cameras, HVAC controls, environmental sensors, door access controls, smoke detectors, intrusion alarms, and more.
Ethernet’s ability to support many different applications on one universal and relatively inexpensive network makes
it possible to install building monitoring and surveillance systems that until recently would have required separate —
and expensive — proprietary cabling. Through the use of Ethernet extenders, you can often even install these systems
using voice-grade cable that’s already installed, saving even more on cabling costs.
Keeping an out.
AlertWerks ServSensor Junior
with Dual Temperature and
Humidity Sensor Kit
(EME104A), blackbox.nl
Airfow Sensor (EME1F1-005)
LinkGain VDSL
Ethernet Extender
(LB300A-R3),
facing page
Voice-grade UTP Cable (EYN712A)
PoE IP Camera
CAT5e Patch Cable
(EVNSL81)
CAT5e Patch Cable (EVNSL81)
Multimode Fiber
Optic Cable
(EFN110-SCSC)
Hardened VDSL Ethernet
Extender with PoE+
(LBPS301A), facing page
AC Power
AC Power
AC Power
AC Power
CAT5e Patch
Cable
(EVNSL81)
CAT5e Patch Cable
(EVNSL81)
Heavy-Duty Edge Switch,
Standard, 115 VAC, 60 Hz
(LBH150A-SC)