LYCOS RETRIEVER 
Ethernet: Ethernet Networking
built 660 days ago
Ethernet was originally developed by DIX - the Digital Corporation, the Intel Corporation, and the Xerox Corporation in the early 1970s. Ethernet is known as a spanning tree topology because the networks expand by branching in tree structures that do not allow redundant paths between nodes. Ethernet uses the CSMA/CD (Carrier Sense Multiple Access with Collision Detection) media contention access method and supports a maximum throughput of 10 or 100 Mbps. The original Ethernet and later IEEE 802.3 protocols are similar but not usually interchangeable.
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The power of an Ethernet LAN (Local Area Network) is tremendous when applied to a factory floor or other industrial application. But industrial applications often require special hardware to interface from existing equipment to the LAN. Harsh industrial conditions, ground differentials and electrical noise can present challenges for standard Ethernet LANs. DIN rail mountable, ruggedized and isolated Industrial Ethernet switches, hubs, servers and converters from B&B Electronics successfully address these challenges. And B&B Electronics provides telephone and email support for these products, as well as technical information on their website.
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An Ethernet station sends data at a rate of 10 megabits per second. That bit allows 100 nanoseconds per bit. Light and electricity travel about one foot in a nanosecond. Therefore, after the electric signal for the first bit has traveled about 100 feet down the wire, the station has begun to send the second bit. However, an Ethernet cable can run for hundreds of feet. If two stations are located, say, 250 feet apart on the same cable, and both begin transmitting at the same time, then they will be in the middle of the third bit before the signal from each reaches the other station.
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Ethernet can go at different speeds. In the beginning, Ethernet was at 10 MBits per second. The Ethernet most often used today is at 100 MBits per second. Most new computers now have the NIC built in, and can go at 1GBit. There are ... standards for 1GBit per second and 10 GBit per second. 100 MBit can usually talk to 10 MBit, and 1 GBit can talk to 100 MBit and usually to 10 MBit (both full and half duplex).
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Ethernet technology delivers Internet access right to your place of business via a cross connect, or within an Ethernet enabled facility. A standard Ethernet handoff to your facility means there is no need for expensive CSU/DSU equipment. While Ethernet connections are available in 10 Mbps, 100 Mbps and 1 Gbps increments, a wide variety of Ethernet bandwidth speeds are available in most major US markets. Ethernet circuits' lower costs, increase bandwidth, offer greater service flexibility, and increased end user control over the services. Ethernet speeds throughout a metro area - reaching more departments and end users. The present solutions for connecting locations with "high bandwidth" DS1s, DS3s, and Frame Relay services are extremely limited in terms of flexibility, bandwidth and cost.
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Micrel Inc., is a leading global manufacturer of IC solutions for the worldwide analog, Ethernet and high bandwidth markets. The Company's products include advanced mixed-signal, analog and power semiconductors; high performance communication, clock management, Ethernet switch and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe and Asia. In addition, the Company maintains an extensive network of distributors and reps worldwide. Web: http://www.micrel.com.
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