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Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. The schematic diagram of mentioned circuit shows following connections with Rj45 magnetics connector. Without R17 to R20 there will be no line terminations - note the values - 51 ohms on each - these are 100 ohm (102 ohm) line terminators for the data - they ensure there are few reflections when the signal is sent down the cable and reach your RJ45. In a little bit more depth; imagine you have some pretty normal 50 ohm coax and you put a 1 V pulse from a signal generator at one end - the cable has a characteristic impedance of 50 ohms and it elicits 20 mA from the signal generator when the 1V pulse occurs. This pulse of voltage and current (a power of 20 mW) travel down the cable and reaches the far end where it is expected to find a terminating 50 ohm resistor but finds an open circuit.
If the unterminated connector is part way down the line from the final termination (a matter of several inches max) then no problem. Not the answer you're looking for?Browse other questions tagged ethernet magnetics port or ask your own question.


For remoting 1000Base-T ethernet connector, is it better to remote PHY from magnetics or magnetics from connector? How can I use a command to delete all files in Downloads whose dates added are greater than 1 year? Does there exist a complex function which is differentiable at one point and nowhere else continuous? Why doesn't the latest Ubuntu edition come with the latest stable Linux kernel version? Magnetic therapy is defined as the application of magnets to the body for healing benefits. The power has to go somewhere so it all reflects back up the cable to the signal generator.
It's the data rate being high (1 bit length being a bit longer in time than a reflection takes to travel up and down) that is the issue and many slow speed data links do not have terminations despite theoretically needing them.


There is no concern of exposing the body to too much or over doing it; the body is intelligent enough to take what it needs. Products and services offered are not intended to diagnose, treat, cure or prevent any disease.
To do this the voltage at the receiving end doubles in order to force the power back to the source. When you look at it on an o-scope it looks a bit of a mess and mucks-up the data pretty badly.
Learn more about the history of magnetic therapy.Skeptics often claim that the benefits of magnet therapy must be due to the placebo effect.



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