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SDSL, or Symmetric Digital Subscriber Line, is a type of DSL internet connection that provides the same data speed for both uploads and downloads. This is ideal for businesses and applications that require a balanced connection, such as video conferencing, VoIP, running a web server, and real-time data backups to the cloud. Unlike ADSL, which prioritizes download speeds, SDSL offers equal performance in both directions.

Key characteristics of SDSL

Symmetrical speeds: Upload and download speeds are equal, which is essential for activities where both sending and receiving data are equally important.

Business applications: It is commonly used by businesses for tasks like hosting their own web and email servers, providing VPN access for remote workers, and supporting cloud-based services that require frequent data uploads.

Consistent performance: SDSL provides a stable connection that can lead to better quality for real-time applications like voice calls and video conferencing, as it reduces latency and interruptions.

Technology: It uses a single copper telephone line and operates on higher frequencies than ISDN technology.

Speed limitations: The specific speeds can vary but are generally lower than newer technologies like VDSL or fiber optics. Older, proprietary SDSL was typically limited to speeds around \(1.544\) Mbps, while the standardized G.SHDSL standard can achieve higher speeds over multiple pairs of wires.