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OCR: THE CURRENT XDSL MENAGERIE xDSL type Meaning Speeds Comment ADSL Asymmetric DSL In: 1.5Mbps The original, used when service is the Out: 64Kbps main topic. HDSL High-speed DSL In: 128Kbps to 1.5Mbps Speeds vary widely. Often deployed in Out: Same symmetrical arrangements iDS! Proprietary In: 1. 1Mbps AlX's proprietary DSL variation, Out: Same RADSI Rate adaptive DSL In: 6.1Mbps Adapts equipment rote to line Out: 1,5Mbps conditions. Very promising SDSL Single line DSL In: 128Kbps to 1.5Mbps Variation on HDSL, which uses two Out: Same wire pairs. SDSL uses one wire pair. VDSL Very high bit rate DSL In: 51Mbps Most bandwidth of all, but 1,000-foot Out: 1.6 to 2.3Mbps limit requires extensive fiber anyway. Table 1: Digital subscriber lines cun fall into several categories, all of which offer various speeds.