G.SHDSL

          DLC is the device of narrow band technology . Narrow band using the circuit network ( TDM based ) for multiplex the n x 64k that from customer side to the network side . LTU and NTU are the device that used for reach the distance between the Exchange terminal and the customer Premises.

          Narrow Band refers to the amount of frequency that is used for a transmission.  “Narrow Band” itself . implies that the transmission allowed is quite small and thus will be limited in how much voice or data information might be send using that method. In telecommunication we look at the speed of the data that is lower than 2 Mbps ( E1 ) is the narrow band or digital data network ( DDN ). The outstanding of the narrow band is security because it makes the connection that only the customer who rent the bandwidth can pass.