LYCOS RETRIEVER 
Ethernet: Ethernet Hub
built 631 days ago
Ethernet networks can ... be wireless. Rather than using Ethernet cable to connect the computers, wireless NICs use radio waves for two-way communication with a wireless switch or hub. In lieu of Ethernet ports, wireless NICs, switches and hubs each feature a small antenna. Wireless networks can be more flexible to use, but also require extra care in configuring security.
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Connections between 10/100 Ethernet adapters are made using cables that run to an Ethernet HUB or Switch. Hubs electrically connect your computers together and switches act like traffic cops making your network more efficient.
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Since its birth, Ethernet has grown to much higher speeds. For example, at the start of 2004, 10 GBit/s (standardized as 802.3ae) network adapters were introduced. Furthermore, the once error-prone, single-cable bus architecture has evolved into a notable error-reduced star topology using hubs and switches.
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Most of the thinking about Ethernet repair have been based on the original Thicknet media. However, modern Ethernet installation may not use any of this old coax cable. The connection to the desktop may be based on telephone wire between the PC and a "hub" device. The hubs may stack up in a wiring closet and then be connected to other rooms using fiber optic cable.
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Two kinds of wiring schemes are available for Ethernet cables. Patch cables and Crossover cables. Crossover cables are special because with a single cable, two computers can be directly connected together without a hub or switch. If a cable does not say crossover, it is a standard patch cable. If you are connecting computers to a hub or switch, you need patch cables
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Ethernet Hub