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MAX4951AE Evaluation Kit Evaluates: General Description Features
MAX4951AE Evaluation Kit Evaluates: General Description Features

... The application circuit utilizes 100I differential controlled-impedance traces and provides two SATA connectors (J1 and J2), allowing for evaluation of the MAX4951AE in a SATA environment. The characterization circuit utilizes 50I controlled-impedance traces and SMA input/output connectors, allowing ...
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... 4. Power limitation control at high marine currents In many industrial projects (Sabella, OPENHYDRO, ALSTOM-Beluga) fixed pitch turbine are used to reduce the maintenance constraints and increase the robustness. So when the marine current speed is higher than the rated value, a fixed-pitch MCT is no ...
Mathematical Basis of Sliding Mode Control of an Uninterruptible
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Better Practice Guide: Data Centre Power
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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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