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Concept
DOCSIS
Summary
Data Over Cable Service Interface Specification (DOCSIS) is an international telecommunications standard that permits the addition of high-bandwidth data transfer to an existing cable television (CATV) system. It is used by many cable television operators to provide cable Internet access over their existing hybrid fiber-coaxial (HFC) infrastructure.
DOCSIS was originally developed by CableLabs and contributing companies, including Arris, BigBand Networks, Broadcom, Cisco, Comcast, Conexant, Correlant, Cox, Harmonic, Intel, Motorola, Netgear, Terayon, Time Warner Cable, and Texas Instruments.
Released in March 1997, DOCSIS 1.0 included functional elements from preceding proprietary cable modems.
Released in April 1999, DOCSIS 1.1 standardized quality of service (QoS) mechanisms that were outlined in DOCSIS 1.0.
(abbreviated D2)
Released in December 2001, DOCSIS 2.0 enhanced upstream data rates in response to increased demand for symmetric services such as IP telephony.
(abbreviated D3)
Released in August 2006, DOCSIS 3.0 significantly increased data rates (both upstream and downstream) and introduced support for Internet Protocol version 6 (IPv6).
First released in October 2013, and subsequently updated several times, the DOCSIS 3.1 suite of specifications support capacities of up to 10 Gbit/s downstream and 1 Gbit/s upstream using 4096 QAM. The new specifications eliminated 6 MHz and 8 MHz wide channel spacing and instead use narrower (25 kHz or 50 kHz wide) orthogonal frequency-division multiplexing (OFDM) subcarriers; these can be bonded inside a block spectrum that could end up being about 200 MHz wide. DOCSIS 3.1 technology also includes power-management features that will enable the cable industry to reduce its energy usage, and the DOCSIS-PIE algorithm to reduce bufferbloat. In the United States, broadband provider Comcast announced in February 2016 that several cities within its footprint will have DOCSIS 3.1 availability before the end of the year. At the end of 2016, Mediacom announced it would become the first major U.
Official source
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