> > u-law is T1 > > a-law is E1 ?????????????????????????????????????????????????????????
mu and A- law are encoding schemes. T1 and E1 are transmission schemes (24 and 30 channels). mu-law encoding and transmission at the DS1-level are what AT&T thought best and is mainly used in North America (including the Carribean and Mexico) and Japan. A-law encoding and E1 digital transmission is what most of the rest of the world is going to, as they go digital. No reason I know of why you couldn't transmit mu-law encoding over an E1 pipe. Rational for maintaining the difference is same as that for measuring things in relation to the extremities of some long dead king of England. As you go from an A-law environment to a mu-law environment, you've got to translate. By agreement, those using mu-law will translate to A-law before it goes across. Those using A-law need not translate by the same agreement and the stuff is translate when it arrives in the mu-law environment. Same for T1 and E1. Ciao, Vic
