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CY36602610
CY36602610

... farms into the electrical network, Flexible AC transmission Systems, FACTS, are widely used. The FACTS STATCOM system is one of them. ST ATCOM has some advantages, such as better performance, quick response, smaller in size, less cost, and capable of satisfying both active and reactive power require ...
Chapter X Transactive Energy (TeMIX) Products
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... All TeMIX Products are subscriptions for power over a single Delivery Interval. Subscriptions impose an obligation on the buyer to purchase and the seller to deliver a TeMIX Power Product. A TeMIX Delivery Interval is specified by a Duration and Start Time. When TeMIX Product is specified for a set ...
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... RS232 connector is a male DB9. The HD2000 is a DTE device (like a PC). The input to our chip accepts up to +25V and -25V, so it is compatible with standard +12 and -12 volt signaling. The output of our chip is rated at +5.4V and -5.4V typical which exceeds the voltage required by the RS232 specifica ...
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< 1 ... 277 278 279 280 281 282 283 284 285 ... 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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