DSLVarianten

DSLVarianten refers to the family of digital subscriber line technologies used to provide broadband over existing copper telephone networks. They differ in modulation, spectrum allocation, data-rate symmetry, and sensitivity to line length. The most common variants include ADSL and its successors, ADSL2 and ADSL2+. These are designed for asymmetric traffic, offering higher downstream than upstream, with performance that decreases as the loop length increases. ADSL2+ can achieve higher downstream rates and improved reach on the same copper.

SDSL (symmetric digital subscriber line) and SHDSL (symmetrical SHDSL) emphasize balanced upstream and downstream bandwidth, making them suitable for business connections and applications requiring reliable upload performance over moderate distances. SHDSL can achieve higher symmetric speeds than many other DSL variants on longer loops.

VDSL (very-high-bit-rate DSL) and VDSL2 provide substantially higher speeds over shorter copper loops. VDSL2 supports multiple profiles to adapt to line length and quality and often benefits from techniques like vectoring and bonding to maximize throughput. G.fast is a newer option targeting very short copper distances and can deliver near-gigabit speeds, commonly deployed in fiber-to-the-curb or cabinet-based architectures.

All DSL variants depend on line quality, distance to the distribution point, and the presence of network equipment such as splitters and modems. They are widely used where fiber to the home is not available, frequently as part of fiber-to-the-curb deployments or as standalone broadband solutions. ITU-T standards underlie these variants, and operators typically offer different profiles aligned with local infrastructure.