What is e1?

E1 is a digital transmission format that is used for communication over traditional leased lines in Europe, Japan, and other parts of the world. It has a capacity of 2.048 Mbps and is mainly used for voice and data communications in business settings. E1 lines are commonly used to connect private branch exchanges (PBXs) and are also used in some wireless and satellite communication systems. The format can support up to 30 channels of voice or data, with each channel operating at 64 kbps. The E1 format is a higher capacity format than the T1 format used in North America, which has a capacity of 1.544 Mbps.