majorsuave

September 05, 2011 at 7:25pm

This is also reminiscing of early multichannel solutions for audio signals such as Quadraphonic or Dolby Pro Logic where 2 distinct channels were encoded on the left channel and 2 on the right channel of a regular stereo cassette/vinyl/reel. 

For Quadraphonic the rear channel phase was shifted 90° from the front channel on both the left and right tracks.

For Dolby Pro Logic it was center and surround that were phased on to the stereo channels. 

With the coming of digital surround  it became easier to write to medium (dvd-blu ray) and carry the signal (via SPDIF/HDMI/Optical) of several different channels.

 

d3v

September 05, 2011 at 3:32pm

That's called twisted pair cabling and is widely used in computer networking. By twisting the pairs together you reduce noise and that gives you a clearer signal.

dgrmouse

September 04, 2011 at 10:18pm

Wrong. Very wrong.

A naive fibre implementation would be similar to a man signaling you with a flashlight.  Dense wavelength multiplexing and other techniques such as this effectively divide the beam up into a /bunch/ of sections, each allowing a different color and flashing at different rates.  It's the difference between watching a single LED and watching a television.  Laying fibre is expensive, so getting the most out of it is important - especially for low-latency intercontinental links.