LYCOS RETRIEVER 
Switch: Switches
built 655 days ago
February 15, 2007 Union Switch & Signal Inc. (US&S) signed a contract with Ansaldo Trasporti Sistemi Ferroviari S.p.A. (ATSF) to provide the Automatic Train Control (ATC) system for Line 5 of the Milan Metro.
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At the heart of the BigIron RX architecture is a single-stage, adaptive self-routing Clos switch fabric with virtual output queuing (VOQ) and distributed packet scheduling. The Clos design allows for a consistent and redundant architecture for all three switch models using a common switch fabric element. The Clos switch architecture provides very low packet latency and jitter and allows for future scalability using multi-stage designs. The switch's adaptive self-routing capability provides for a more scalable solution than architectures that rely on centralized packet schedulers. Additionally, it provides for routing around backplane failures such as electrical faults and fair utilization of backplane bandwidth independent of packet content.
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As for vendors, ZTE won all the switch orders in the ADSL capacity expansion project of the Bolivian operator COTAS in March 2007. With this, ZTE once again successfully entered the market of leading operators in South America. This highlights the strength of ZTE's data communication products. After withdrawing from Huawei-3Com, Huawei, another important communication equipment vendor in China has mainly offered telecom-level products that support operators' metro-Ethernet building. In this field, it continued to maintain the leading advantage. After the former Huawei-3Com was renamed H3C, the existing product line structure has been kept.
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"The Rx-to-OTC switch of MiraLAX offers millions of sufferers an innovative new, alternative for relief of constipation, which until now has been available only by prescription," said Jack A. DiPalma, M.D., immediate past president of the American College of Gastroenterology. As a prescription product, MiraLAX offered break-through treatment of constipation. When used as directed, it now provides this proven efficacy without a prescription, effectively treating constipation with no harsh side effects."
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A DPDT switch has six connections, but since polarity reversal is a very common usage of DPDT switches, some variations of the DPDT switch are internally wired specifically for polarity reversal. These crossover switches only have four terminals rather than six. Two of the terminals are inputs and two are outputs. When connected to a battery or other DC source, the 4-way switch selects from either normal or reversed polarity. Intermediate switches are ... an important part of multiway switching systems with more than two switches (see next section).
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The LM5015 high-voltage switch-mode regulator features all of the functions necessary to implement efficient two-switch forward and two-switch flyback power converters with a minimum of external components. The easy-to-use regulator integrates high-side and low-side 75V N-Channel MOSFETs with a minimum 1A peak current limit. The voltage across the MOSFETs employed in the two-switch topology is clamped to the input voltage, allowing the input voltage range to approach the rating of the MOSFETs. The regulator control method is based on current-mode control, providing inherent ease-of-loop compensation and line feed-forward for superior rejection of input transients.
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