E1 is a digital telecommunications transmission format widely used in Europe. It's a type of TDM (Time Division Multiplexing) system, which carries 30 voice channels plus signaling and synchronization channels, totaling 32 channels at a data rate of 2.048 Mbit/s. It is commonly used for connecting PBXs (Private Branch Exchanges) to the PSTN (Public Switched Telephone Network) and for high-speed data transmission.
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