E1 is a European digital transmission format invented by ITU-T and given the name of the European Conference on Postal and Telecommunications Management (CEPT). It is equivalent to the coordination of transport systems in North America. E2 to E5 are carriers in increasing multiples of E1 format.

The electronic carrier is part of the series of advanced transport systems for the digital transmission of multiple simultaneous telephone calls by time division multiplexing. E1 consists of 32 channels, which can be used to make simultaneous voice calls and each channel is called a "time period" (TS). In accordance with the ITU-T recommendations, two reporting and synchronization time periods are assigned. Therefore, E1 can carry 30 voice calls or data connections simultaneously.

Similar to T-1 in North America, E1 is the European format for digital transmission. E1 carries 2 Mbps signals (32 channels at 64 kbps, with two dedicated signal and control channels), compared to T1, which carries 1.544 Mbps signals (24 channels at 64 kbps).

The E1 connection works on two separate sets of wires, usually an unsecured twisted pair (balanced cable) or using coaxial (unbalanced cable). The maximum peak signal is encoded at 3 volts with pulses using the method to avoid prolonged periods without polarity changes. Data line speed is 2.048 Mbps
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