At what speed does a T1 circuit transmit data?

A T1 circuit transmits data at a speed of 1.5 Mbps, which makes this the correct answer. This transmission speed is a standard for T1 lines, which have become a commonly used digital transmission link in telecommunication systems. The T1 line provides a dedicated and reliable means for data and voice transmission over copper or fiber optic lines.

The T1 circuit consists of 24 individual channels, each capable of transmitting at 64 Kbps. When these channels are aggregated, the total data rate reaches 1.5 Mbps. This capacity allows T1 circuits to accommodate multiple voice calls or data streams simultaneously, making it a popular choice for businesses that require stable and efficient communication solutions.

Understanding this standard is essential for anyone working in telecommunications, networking, or related fields, as it helps in making informed decisions about bandwidth requirements and network infrastructure.