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DU-45MV 50/100/200mV DC Full Scale 4 1/2 Digit with 0.56” LEDs
DU-45MV 50/100/200mV DC Full Scale 4 1/2 Digit with 0.56” LEDs

... The meter’s plastic case is made from fire retardant polycarbonate. A metal surround case can be ordered to enhance the meter’s fire retardant capabilities and also provide shielding against electromagnetic interference (EMI). The metal case slides over the polycarbonate case and is held firmly in p ...
Optimised placement of control and protective devices in electric
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... In [4], a model for the optimal placement of control devices considering the cost of non-supplied energy and the investment cost of sectionalizing switch placement is presented. Repairing times and failure rates of the network and the sectionalizing switches are taken into account. The problem is so ...
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... 4.2 Structure data The structure's layout is described in Annex Structure layout. The prevalent type of structure is: industrial The structure could be subject to: - loss of human life - loss of economic value To evaluate the need of protection against lightning, according to standard EN 62305-2, s ...
Chapter 1 - Learning Management System
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< 1 ... 140 141 142 143 144 145 146 147 148 ... 576 >

Power over Ethernet



Power over Ethernet or PoE describes any of several standardized or ad-hoc systems which pass electrical power along with data on Ethernet cabling. This allows a single cable to provide both data connection and electrical power to devices such as wireless access points or IP cameras. Unlike standards such as Universal Serial Bus which also power devices over the data cables, PoE allows long cable lengths. Power may be carried on the same conductors as the data, or it may be carried on dedicated conductors in the same cable.There are several common techniques for transmitting power over Ethernet cabling. Two of them have been standardized by IEEE 802.3. Since only two of the four pairs are needed for 10BASE-T or 100BASE-TX, power may be transmitted on the unused conductors of a cable. In the IEEE standards, this is referred to as Alternative B. Power may also be transmitted on the data conductors by applying a common-mode voltage to each pair. Because twisted-pair Ethernet uses differential signalling, this does not interfere with data transmission. The common mode voltage is easily extracted using the center tap of the standard Ethernet pulse transformer. This is similar to the phantom power technique commonly used for powering audio microphones. In the IEEE standards, this is referred to as Alternative A.In addition to standardizing existing practice for spare-pair and common-mode data pair power transmission, the IEEE PoE standards provide for signalling between the power sourcing equipment (PSE) and powered device (PD). This signaling allows the presence of a conformant device to be detected by the power source, and allows the device and source to negotiate the amount of power required or available. Up to a 25.5 watts is available for a device.
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