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FINING Electronics offers a comprehensive selection of Power Over Ethernet (PoE)
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networking equipment including injectors and splitters. PoE technology simplifies
the deployment of a network by delivering power and data via a standard Ethernet
cable. PoE gives network administrators the freedom to deploy networking equipment
at any location, without having to rely on power outlet sources.
FINING Electronics's PoE splitters split the simultaneous transmission of data and
power into two separate outputs. PoE splitters offer the inverse functionality of
PoE injectors. Our 802.3af/at splitters offer different data rate options and
interfaces to help network administrators complete their deployment with the right
unit. What is a PoE Splitter?
FINING Electronics's PoE injectors enable network administrators to pair PoE-ready
networking devices with non-PoE devices to create a flexible network architecture.
PoE injectors converge power and data inputs into a simple PoE output and simplify
the deployment of powered devices such as VoIP phones, IP surveillance cameras,
and WAPs Our 802.3af /at options offer a simple plug-and-play installation with
mid-span, gigabit, and industrial injector options.
The Overview of Ethernet Network
Ethernet network is the most commonly used LAN at present. The transmission rate
of Fast Ethernet is 100 Mbit/s, while the transmission rate of Gigabit Ethernet is
up to 1000 Mbit/s. Ethernet has the remarkable advantages of high flexibility,
relatively simple and easy to implement. Its transmission medium mainly includes
twisted pair, coaxial cable, optical fiber and radio. Now it has become the most
important local area network.
Basic Functions of PoE Products(Power Over Ethernet Device)
1. Recognition of signal impedance. When an input voltage is applied to the
device, it must present the correct identification signal impedance within the
specified voltage range. When an PoE equipment requests power supply, it first
sends a 2.5V~10V voltage signal to ethernet. When the voltage signal is detected
by the power equipment, a 23750~26250 ohm resistance is placed on the power supply
circuit, and the current will change with the input voltage. By detecting the
current, it is confirmed that there is an effective power supply device in the
Ethernet cable terminal. If the resistance is placed in the range of 1200-23750
ohms or 26250-45000 ohms, it is considered that the Ethernet electrical equipment
is effective but does not need power supply. Resistance values in other ranges
mean that the detected Power Over Ethernet devices are invalid.
2. There are different types of electrical equipment, each type corresponding to a
certain current. For example, the current of a "0" type electrical device is 0.5
to 4 mA. When the powered device detects a valid signal, it is classified. The
specific method is to raise the voltage sent to the network link to 15.5V~20.5V,
so that the Ethernet power device obtains a fixed current, and then completes the
classification of the power device according to the current range.
3.There are two main types of switches for connecting Ethernet power (Power Over
Ethernet PoE). One is a bipolar crystal switch, which has high power efficiency
and low cost. The other is a MOSFET switch, which is extremely efficient and can
SOURCE: Import-Export Bulletin Board (http://www.imexbb.com/)
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