56 KBPS
\fˈɪftisˈɪks kˌe͡ɪbˌiːpˌiːˈɛs], \fˈɪftisˈɪks kˌeɪbˌiːpˌiːˈɛs], \f_ˈɪ_f_t_i_s_ˈɪ_k_s k_ˌeɪ_b_ˌiː_p_ˌiː__ˈɛ_s]\
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(56 kilobits per second) The data capacity ofa normal single channel digital telephone channel in NorthAmerica. The figure is derived from the bandwidth of 4 kHzallocated for such a channel and the 16-bit encoding (4000times 16 = 64000) used to change analogue signals todigital, minus the 8000 bit/s used for signalling andsupervision.At the end of 1997 there were two rival modem designscapable of this rate: k56flex and US Robotics' X2. InFebruary 1998 the ITU proposed a 56kbps standard calledV.90, which is expected to be formally approved duringSeptember 1998.
By Denis Howe
