56 kbps
communications
(56 kilobits per second) the data capacity of a normal single channel digital telephone channel in north america. the figure is derived from the bandwidth of 4 khz allocated for such a channel and the 16-bit encoding (4000 times 16 = 64000) used to change -n-logue signals to digital, minus the 8000 bit/s used for signalling and supervision.
at the end of 1997 there were two rival modem designs capable of this rate: k56flex and us robotics’ x2. in february 1998 the itu proposed a 56kbps standard called v.90, which is expected to be formally approved during september 1998.
(1998-09-15)
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