re: Bits, Bauds and Hz


John Leong (leong%ANDREW@PT.CS.CMU.EDU)
Wed, 15 Jan 86 10:59:15 EST


General Interest .....

T1 is the lowest TDM digital transmission rate used by the phone companies
for long line transmission. The standard bit rates are :

DS1 : 1.544M (24 voice)@*
DS2 : 6.312M (4 * DS1, 96 voice)@*
DS3 : 44.736M (7 * DS2, 672 voice)@*
DS4 : 274.176M (6 * DS3, 4032 voice)

Most DS1 or T1 data are done with twisted pairs. Fibre is normally used
only for DS4 or T4 data rate which is heavily used for (real long distance)
inter-citiy traffics.

Leong



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