On Sun,5/1/2016 6:19 PM, Michael Blake wrote:
The plug and jack are described by the number of available contact positions and the number of contacts installed in those positions.
The proper wiring of Ethernet cables REQUIRES that color code be strictly observed. An Ethernet cable is four twisted pairs, each having a different twist ratio. There's a Brown/White pair, an Orange/White pair, a Green/White pair, and a Blue/White pair.
Those four pairs each carries a separate signal, and it is critical that crosstalk between pairs is minimized. Crosstalk rejection is provided two ways -- primarily by twisting, AND improved by each pair having a different twist ratio.
In other words, simply having DC continuity between pins at each end of the cable is not enough -- they must be correctly paired, and those pairs most tightly twisted (for better noise rejection) are wired to their assigned pins.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
