Soldato
Twisted pair cables are designed to reject line noise from adjacent cables, phase errors are prevented by using complex line encoding. Which is why you can transmit gigabit ethernet speeds over cat5 without any problems at all. Ethernet cards are designed to add the correct line encodings.
Digital transmission is a lot more complex than simply 0 and 1 though. Just as important is the digital clock. Both transmitter and receiver need to be in sync, and when they are not you get jitter. Longer and cheaper cables have a tendancy to make jitter issues worse.
With Audio and Video jitter based errors are generally igored, and the errored signal is fed into the DACS. This is because real time applications cant 'wait'. A pause in say an 'audio' datastream would be heard as either a short period of silence, or a pop etc. But a small bit error will be a lot less noticable.
This is equally true of video data. A few bit errors would likely go unnoticed. But with cheaper cables eventually the error rate gets so high that the TV (or whatever device is receiving the signal) will eventually say enough is enough and just fail to connect.
Computers are different, they have several choices, first is to try and buffer the data, so as it comes in, its reclocked and the jitter is reduced, then it can checksum the data and if it is errored it will simply ask for a retransmission, as data accuracy is more important than the timeing.
Digital transmission is a lot more complex than simply 0 and 1 though. Just as important is the digital clock. Both transmitter and receiver need to be in sync, and when they are not you get jitter. Longer and cheaper cables have a tendancy to make jitter issues worse.
With Audio and Video jitter based errors are generally igored, and the errored signal is fed into the DACS. This is because real time applications cant 'wait'. A pause in say an 'audio' datastream would be heard as either a short period of silence, or a pop etc. But a small bit error will be a lot less noticable.
This is equally true of video data. A few bit errors would likely go unnoticed. But with cheaper cables eventually the error rate gets so high that the TV (or whatever device is receiving the signal) will eventually say enough is enough and just fail to connect.
Computers are different, they have several choices, first is to try and buffer the data, so as it comes in, its reclocked and the jitter is reduced, then it can checksum the data and if it is errored it will simply ask for a retransmission, as data accuracy is more important than the timeing.
