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IN the UK the CSU/DSU's are called Kilostream NTU's if you are using a 64k Link then it will be x.21, if you are using Nx64 or a G703 converter then it would again be presented as X.21, (this converts between the G703 BNC and presents as X.21 to the ...
I think that structured and unstructured is the same as channelized and unchanelized, channelized is split into 64K Timeslots, these can be varied for Nx64. The Channelized is normally clocked.Unchannelized is normally a stright 2meg pipe, this is no...