DOCSIS Data Over Cable Service Interface Specification
The standard that lets cable-TV coax also deliver broadband.
Created by CableLabs in 1997. Versions: 1.0 → 4.0. DOCSIS 3.1 (2013) gives 10 Gbps down / 1–2 Gbps up; DOCSIS 4.0 (2017) symmetric 10/6 Gbps. Competes with fibre (FTTH). In the US, Comcast and Spectrum dominate using DOCSIS; in Sweden, fibre dominates. The modem at home speaks DOCSIS to the cable company's CMTS at the other end.