Which Digital Subscriber Line (DSL) type provides 1.544 duplex transmission on a single twisted pair line?

The correct answer is SDSL, which stands for Symmetric Digital Subscriber Line. This type of DSL technology is specifically designed to provide symmetric data transmission, meaning that both upload and download speeds are equal. SDSL operates over a single twisted pair of copper wiring and can achieve a duplex transmission rate of 1.544 Mbps, which is equal to the T1 line standard.

In contrast to other types of DSL, like ADSL (Asymmetric Digital Subscriber Line), which offers faster download speeds compared to upload speeds, SDSL maintains a balanced data rate. This characteristic makes SDSL particularly suitable for businesses and applications requiring consistent data flow in both directions, such as video conferencing, online gaming, and high-speed internet access.

VDSL (Very High Bitrate Digital Subscriber Line) provides faster speeds but is not limited to 1.544 Mbps and typically requires more sophisticated equipment and shorter distances from the central office to achieve its higher speeds. HDSL (High Bitrate Digital Subscriber Line) can also provide 1.544 Mbps, but it operates under different principles and typically involves multiple twisted pairs.

Overall, SDSL uniquely supports the 1.544 Mbps duplex transmission standard over a single line, making it the ideal choice for scenarios requiring equal upload and