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The document discusses the development of digital transmission standards for telephone signals. In 1965, the T1 standard was introduced in the US and Japan, allowing 24 digital phone channels to be multiplexed into a 1.544 Mbps signal. Europe later developed the E1 standard in 1968 allowing 30 digital phone channels plus overhead bits to be multiplexed into a 2.048 Mbps signal. The E1 standard provides signaling capabilities and uses time-division multiplexing to transmit phone channels and overhead data in

Author

Prafull B

Language

EN