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What is T1 and E1? How many D and B channels do they have in case of ISDN?
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Answer Posted / Neerak Kumar Meena
T1 is a digital transmission standard used primarily in North America. It carries 24 channels, each capable of carrying voice or data. Among these, 23 are data channels (D channels) and one is a control channel (B channel). E1 is a digital transmission standard used primarily in Europe and other parts of the world. It carries 32 channels, each capable of carrying voice or data. Among these, 30 are data channels (D channels) and two are control channels (B channels).
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