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What is E1,T1 Line? Difference between E1 and T1
Source: UPCOM
With the development of communication systems to the present, voice communication is still play an important role in all communication traffic. the method used in the initial communication system is Frequency Division Multiplexing (FDM Frequency Division Multiplexing).

With the pursuit of transmission rate, transmission quality, and transmission cost, digital systems such as PCM (Pulse Code Modulation) and TDM (Time Division Multiplexing) technology have been widely used in communication systems.

In PDH (Plesiochronous digital hierarchy), two basic PCM communication systems are used as the basis, one is the T1 system recommended by ANSI, and the other is the E1 system recommended by ITU-T. The T1 system is widely used mainly in North America (the J1 used in Japan is basically similar to the T1), while the E1 system is used in Europe and other Asian countries.

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