7th April 2005 at 06:02
#29279
dmck
Guest
I thought that he meant the 16kb I.P. overheads added to the 64kb voice packet.
Your thoughts on bi-directional data channel is interesting. I’ve always assumed there is a 144kb transmission in each direction (2B+D) but that they are operating at different carrier frequencies, so that they in effect become seperate send and receive paths, but operating over a single pair of wires and would require 188kb b/w (plus some seperation)