Editing DOCSIS (section)

==Versions==
; {{Visible anchor|DOCSIS 1.0}}
: Released in March 1997, DOCSIS 1.0 included functional elements from preceding proprietary [[cable modem]]s.<ref name="cablelabs-docsis1.0">{{cite web |url=http://www.cablelabs.com/wp-content/uploads/specdocs/SP-CMTS-NSI-I01-960702.pdf |title=Cable Modem Termination System–Network Side Interface Specification |publisher=CableLabs |archive-url=https://web.archive.org/web/20160817080658/http://www.cablelabs.com/wp-content/uploads/specdocs/SP-CMTS-NSI-I01-960702.pdf |archive-date=August 17, 2016 |access-date=July 27, 2016 }}</ref>
; {{Visible anchor|DOCSIS 1.1}}
: Released in April 1999, DOCSIS 1.1 standardized [[quality of service]] (QoS) mechanisms that were outlined in DOCSIS 1.0.<ref name="DOCSIS RFI 1.0-I01">{{cite web |url=http://www.cablelabs.com/specs |title=Specifications |publisher=CableLabs |access-date=December 2, 2017 }}</ref>
; {{Visible anchor|DOCSIS 2.0}} (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.
; {{Visible anchor|DOCSIS 3.0}} (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).
; {{Visible anchor|DOCSIS 3.1}}
: First released in October 2013, and subsequently updated several times, the DOCSIS 3.1 suite of specifications support capacities of up to 10&nbsp;Gbit/s downstream and 1&nbsp;Gbit/s upstream using 4096 [[Quadrature amplitude modulation|QAM]]. The new specifications eliminated 6&nbsp;MHz and 8&nbsp;MHz wide [[channel spacing]] and instead use narrower (25&nbsp;kHz or 50&nbsp;kHz wide) [[orthogonal frequency-division multiplexing]] (OFDM) [[subcarrier]]s; these can be [[Link aggregation|bonded]] inside a block spectrum that could end up being about 200&nbsp;MHz wide.<ref>{{cite web |url=http://www.lightreading.com/document.asp?doc_id=226144 |title=DOCSIS 3.1 Targets 10-Gig Downstream |website=[[Light Reading]] }}</ref> DOCSIS 3.1 technology also includes [[Power management|power-management]] features that will enable the cable industry to reduce its energy usage, and the DOCSIS-PIE<ref>{{cite web |url=https://tools.ietf.org/html/rfc8034 |title=Active Queue Management (AQM) Based on Proportional Integral Controller Enhanced (PIE) for Data-Over-Cable Service Interface Specifications (DOCSIS) Cable Modems |first1=White |last1=Greg |first2=Pan |last2=Rong |website=Tools.IETF.org |access-date=April 12, 2021 }}</ref> algorithm to reduce [[bufferbloat]].<ref>{{cite web |title=Active Queue Management in DOCSIS 3.x Cable Modems |url=http://www.cablelabs.com/wp-content/uploads/2014/06/DOCSIS-AQM_May2014.pdf |publisher=CableLabs |access-date= }}</ref> 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.<ref>{{Cite web |title=Comcast to Introduce World's First DOCSIS 3.1-Powered Gigabit Internet Service in Atlanta, Chicago, Detroit, Miami, and Nashville |url=http://www.businesswire.com/news/home/20160202005313/en/Comcast-Introduce-World%25E2%2580%2599s-DOCSIS-3.1-Powered-Gigabit-Internet |website=BusinessWire.com |date=February 2, 2016 |access-date=February 15, 2016 }}</ref> At the end of 2016, [[Mediacom]] announced it would become the first major U.S. cable company to fully transition to the DOCSIS 3.1 platform.<ref>{{cite web |url=http://www.lightreading.com/cable/docsis/mediacom-going-all-docsis-31-by-year-end/d/d-id/728829 |title=Mediacom Going All DOCSIS 3.1 by Year-End |website=Light Reading |access-date=December 2, 2017 }}</ref>
; {{Visible anchor|DOCSIS 4.0}}
: Improves DOCSIS 3.1 to use the full spectrum of the cable plant (0&nbsp;MHz to ~1.8&nbsp;GHz) at the same time in both upstream and downstream directions. This technology enables multi-gigabit symmetrical services while retaining [[backward compatibility]] with DOCSIS 3.1. CableLabs released the full specification in October 2017.<ref>{{Cite web |first=Belal |last=Hamzeh |title=CableLabs Completes Full Duplex DOCSIS Specification |url=https://www.cablelabs.com/cablelabs-completes-full-duplex-docsis-specification |publisher=CableLabs |date=October 11, 2017 |access-date=June 17, 2019 }}</ref> Previously branded as DOCSIS 3.1 Full Duplex, these technologies have been rebranded as part of DOCSIS 4.0.<ref name="DOCSIS 4.0 Tech">{{Cite web |url=https://www.cablelabs.com/technologies/docsis-4-0-technology |title=DOCSIS 4.0 Technology |publisher=CableLabs |access-date=March 7, 2023 }}</ref>
; {{Visible anchor|DOCSIS 5.0}}
: There is currently no official version of DOCSIS declared as DOCSIS 5.0 by CableLabs. There is speculation proposing targets of 25&nbsp;Gbit/s downstream and at least 5&nbsp;Gbit/s upstream at 3&nbsp;GHz, and a reference implementation that was demonstrated in 2024.<ref>{{Cite web |last=Baumgartner |first=Jeff |date=September 25, 2024 |url=https://www.lightreading.com/cable-technology/comcast-charter-and-broadcom-take-aim-at-25-gig-on-hfc |title=Comcast, Charter and Broadcom Take Aim at 25-Gig on HFC |website=[[Light Reading]] |publisher=[[Informa]] |access-date=December 29, 2024 }}</ref>

===Comparison===
Several DOCSIS versions can co exist by using frequency division multiplexing and separating new DOCSIS versions from old ones according to their operation frequencies.<ref>{{cite web |last=Downey |first=John J. |date=July 31, 2014 |title=DOCSIS 3.1 Overview |url=https://www.piedmontscte.org/resources/july2014/D3.1-Overview-JJD-073114.pptx |website=PiedmontSCTE.org |access-date=October 24, 2024 }}</ref>

{| class="wikitable"
|+ DOCSIS version comparison<ref name="DOCSIS 4.0 Tech" />
|-
! DOCSIS version
! Production date
! Maximum downstream capacity
! Maximum upstream capacity
! Features
|-
| 1.0
| <!-- March -->1997
| rowspan="3" | 40&nbsp;Mbit/s
| rowspan="2" | 10&nbsp;Mbit/s
| Initial release
|-
| 1.1
| 2001<!-- Not the same as other sources (April 1999)? -->
| Added VOIP capabilities and QoS mechanisms
|-
| 2.0
| 2002<!-- Not the same as other sources (December 2001)? -->
| 30&nbsp;Mbit/s
| Enhanced upstream data rates
|-
| 3.0
| <!-- August -->2006
| 1&nbsp;Gbit/s<!-- Note that both of these are the WHOLE-NODE bandwidth totals, and for this case this is approximately but not exactly the maximum attainable under BEST-POSSIBLE-CASE conditions (minimum maximum conditions under the spec are closer to 160/120 (4/4 bonded), while best-case is a 32/8 bonded connection producing 1200/200). -->
| 200&nbsp;Mbit/s
| Significantly increased downstream and upstream data rates, introduced support for IPv6, introduced [[channel bonding]]
|-
| 3.1
| <!-- October -->2013
| rowspan="2" | 10&nbsp;Gbit/s<!-- Note that both of these are the WHOLE-NODE bandwidth totals, using standardized and somewhat idealized assumptions w.r.t. bandwidth availability and spectrum allocation. However, maximums under certain conditions (wider spectrum, higher QAM utilized, etc.) CAN (significantly) exceed these numbers! -->
| 1–2&nbsp;Gbit/s
| Significantly increased downstream and upstream data rates, restructured channel specifications
|-
| 4.0
| 2017<!-- Cable labs released the spec for use in October 2017. -->
| 6&nbsp;Gbit/s
| Significantly increased upstream rates from DOCSIS 3.1
|}