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WIO-12 - Legrand
WIO-12 - Legrand

Meyer Sound MM-4XP Rental Spec Sheet
Meyer Sound MM-4XP Rental Spec Sheet

... to the MM‑4XP loudspeakers at cable lengths of up to 300 feet with just 1 dB of loss in peak SPL using 18 AWG wire. The use of composite multiconductor cables (such as Belden® 1502) allows a single cable to carry both audio and DC power to the MM‑4XP. Longer cable lengths are possible for moderate a ...
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... Designed for system administrators, quality and test engineers, the SLC 8000 provides easy, secure administration and management of IT equipment from anywhere and at any time. Users can access the SLC 8000 device ports via Telnet/SSH, or a web browser-based console client without any proprietary sof ...
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TDR500 Cable Fault Locator
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... Cable route tracing The TDR500 can inject an oscillating 810 Hz/1.11 kHz tone onto the de-energised transmission line or power line. The warble tone allows the engineer to trace the faulty cable pair with the use of a commercially available tone ...
EX3300 Ethernet Switch
EX3300 Ethernet Switch

... The EX3300 line of Ethernet switches is designed to support many of the same failover capabilities and high availability (HA) functionality as the Juniper Networks EX4200 line of Ethernet switches with Virtual Chassis technology. Each EX3300 switch is capable of functioning as a Routing Engine when ...
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.3, pp. 1809-1814
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.3, pp. 1809-1814

... solutions to fundamental frequency problems. Power electronics modules can be added in situations where rapid control action is required to damp oscillations or prevent excessive voltage variations. Hence, basic IPC solutions utilize only conventional equipment, such as capacitors, inductors and pha ...
PDF - This Chapter
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... – PV plants using inverters that are IEEE Std 1547/UL 1741 compliant contribute fault current for a few cycles  A fault on the line will typically trigger an “instantaneous AC undervoltage” trip of the inverter  Inverter gating will stop immediately, followed by the opening of the AC contactor aft ...
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... looking to power VoIP phones, wireless access points or network cameras. The DGS-1210-10P is a 8-port Smart Managed PoE+ Switch that provides 8 PoE-enabled ports that can supply power of up to 30 W each. Whereas the DGS-1210-28P/52P/52MP are Smart Managed PoE+ switches with power budgets of 193/193/ ...
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... It is observed that the IEEE recommended practice system works with AC supply and the loads connected are also AC. In order to implement the concept of LVDC distribution system, power electronic devices are added at required locations in IEEE recommended practice system. The loads are also modified ...
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... ITU-T G.7041 Generic Framing Procedure (GFP), and ITU-T X.86 Link Access Procedure- SDH(LAPS). It also supports the IEEE 802.3 10 /100 Ethernet network interface. ETH provides auto-sensing 10/100 Mbps switching capabilities for efficient connectivity to servers, workstations and others attached devi ...
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... interconnect and access are available from a variety of vendors and provide wireline to wireless transmission and wireless to wireline reception of digital packet information. Electrical connection is typically available to Ethernet and Token Ring systems. Wireless technology is primarily utilized t ...
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< 1 ... 460 461 462 463 464 465 466 467 468 ... 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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