10 feet over in my basement, the twisted pair connection, literally. Four separate phone lines, connected by by stripping the insulation and twisting the wires together. Leave the bare copper flailing about for better radiation. They go off, who knows where, except for two of them, I pushed them back down underneath the house when redoing the floors. They sit on the ground.
This is old, desicated solid copper, with a lot of kinks. Kinking my DSL line is a favorite technique.
There really isn't a wall connection, it mainly just hangls limp, like right here, on my computer, there is this old broken telephone connection, hanging from a crooked nail. ATT's shiny cable looks stark next to it. In side, where those little RJ connectors plug, well a few of the prongs got twisted.
3 Mbps?? Dunno how but it does.
Well, I do know a little. Twisting the copper inside the pair offers really good common noise cancellation, so the SNR is damned good. Applying Shannon equation you input the infinite length SNR into the equation. There must exist an encoding to get that bits/hz, and for the phone line, the encoding is cancelling the echos from all the kinks I have.
No comments:
Post a Comment