Oh. That is correct. When I checked what I wrote. I see some mistakes from my side. It shouldn´t be 900M but 900k.
I have looked at it on many different angles now. I´m staring to get somewhere now. But the limit in this channel is 8.97 Mbit/s. With the right equation...
I have a spectrum of 900khz that is divided into channels of 4kHz each. That makes 225 channels. Then each channel can transfer 4000 symbols/sec. I will be using the QAM-256 and that allows 8 bits/symbol. That means each channel can transfer 4000*8= 32e3 bit/s. And the channels in total makes...
Okey, I have a problem now. I´m suposed to sketch a graf of how long range on a copper wire some different speeds have ex 256 kbit/s etc.
I have 225 channels of each 4kHz and it can transfer 4000 symbols/sec. The effect on each channel is 0.1mW and the noise is -100dBm.
The signal is...