What are the four basic components that make up a t1 circuit?

A T1 circuit consists of four basic components: the digital transmission medium, typically a twisted copper pair or fiber optic cable; the T1 line termination equipment, which includes the T1 demarcation point; the T1 interface devices, such as multiplexers or routers; and the T1 signaling protocol, which governs data transmission at a rate of 1.544 Mbps. Together, these components facilitate the reliable transmission of voice and data over long distances.