Editing DOCSIS (section)

=== Upstream ===
Traditional DOCSIS upstream in North America uses the 5–42&nbsp;MHz frequency range. The 5–65&nbsp;MHz range is used by EuroDOCSIS. This is known as a "low-split" or "sub-split" design, capable of a total shared capacity of ~108&nbsp;Mbit/s upstream (assuming 4 SC-QAM upstream channels) for the service group.<ref>{{Cite web |title=StackPath |url=https://www.broadbandtechreport.com/docsis/headend-hub/article/16437269/the-significant-differences-between-docsis-and-eurodocsis |website=BroadbandTechReport.com |access-date=June 25, 2022 }}</ref>

In recent years,{{When|date=June 2022}} cable operators{{Which|date=October 2022}} have begun to increase the amount of bandwidth dedicated to the upstream. The two most popular options for this include a "mid-split" or "high-split".<ref>{{Cite web |date=December 9, 2021 |title=Band Splits 101: Splitting Our Way to 10G |url=https://www.cablelabs.com/blog/band-splits-splitting-our-way-to-10g |publisher=CableLabs |access-date=June 25, 2022 }}</ref>

A mid-split increases the upstream frequency range to 5–85&nbsp;MHz, supporting a total shared upstream capacity of ~450&nbsp;Mbit/s (assuming 4 SC-QAM + OFDMA channels) for the service group.<ref name="Howald 2021">{{Cite conference |last1=Howald |first1=Robert |last2=Wolcott |first2=Larry |last3=Ellis |first3=Leslie |date=October 11, 2021 |title=Execute the Upstream Makeover without Leaving Scars |url=https://www.scte.org/documents/4614/2104_Howald_3441_paper.pdf |conference=Cable-Tec Expo |publisher=SCTE |access-date=June 26, 2022 }}</ref>

A high-split increases the upstream frequency range to 5–204&nbsp;MHz, supporting a total shared upstream capacity of ~1.5&nbsp;Gbit/s (assuming 4 SC-QAM + OFDMA channels) for the service group.<ref name="Howald 2021" />

DOCSIS&nbsp;4.0 in both full-duplex (FDX) and extended spectrum DOCSIS (ESD) configurations will support upstream speeds surpassing 5&nbsp;Gbit/s.<ref>{{Cite web |last=Baumgartner |first=Jeff |date=April 29, 2022 |title=Comcast, Charter Take DOCSIS 4.0 and '10G' a Step Toward Commercial Reality |url=https://www.lightreading.com/cable-tech/comcast-charter-take-docsis-40-and-10g-step-toward-commercial-reality-/d/d-id/777103 |website=Light Reading |location=Louisville, Colorado |access-date=June 26, 2022 }}</ref>