RFDOCSIS RF Frequency Range and Bandwidth Explained
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This page details the DOCSIS RF frequency ranges and bandwidths used by various DOCSIS versions, specifying the frequencies and bandwidths for both downstream and upstream traffic.
What is Frequency Range and Bandwidth?
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Frequency Range: The range of frequencies that a wired or wireless device can utilize to modulate baseband information and transmit it over the transport medium. This falls within the electromagnetic spectrum, from a few KHz to just below the infrared light frequency range.
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Occupied Bandwidth or Channel Bandwidth: The total sum of channel frequencies used by a device, including channel spacing.
DOCSIS Frequency Range and Bandwidth for Downstream
The following table outlines the DOCSIS frequencies and bandwidths used in the downstream direction, from the CMTS (Cable Modem Termination System) to the CM (Cable Modem).
| Standard Version | Frequency Range | RF Channel Spacing (Design Bandwidth) |
|---|---|---|
| DOCSIS 1.0/1.1 | Carrier frequency: 91 to 857 MHz +/- 30KHz Downstream electrical input to CM (Cable Modem) | 6 MHz |
| DOCSIS 2.0 | Passband between lower edge and upper edge, lower edge between 50 and 54 MHz, upper edge in the range from 300 to 864 MHz | 6.4 MHz |
| DOCSIS 3.0 | 108 MHz to 1 GHz | 6 MHz or 8 MHz |
| DOCSIS 3.1 | 258 MHz to 1218 MHz (Initial Phase), 1794 MHz (Final Phase) | Between 24 MHz and 192 MHz |
| DOCSIS 4.0 | • FDX (Full Duplex) : 108 to 1218 MHz • FDD (Frequency Division Duplex) : 1536 MHz of occupied downstream spectrum in the range from 54 MHz to 1794 MHz | 24 to 192 MHz |
DOCSIS Frequency Range and Bandwidth for Upstream
The table below details the DOCSIS frequencies and bandwidths used in the upstream direction, from the CM (Cable Modem) to the CMTS (Cable Modem Termination System).
| Standard Version | Frequency Range | Channel Bandwidth |
|---|---|---|
| DOCSIS 1.0/1.1 | 5 to 42 MHz edge to edge frequency range | Upstream electrical output from CM (Cable Modem): Between 200 KHz and 3.2 MHz |
| DOCSIS 2.0 | subsplit (5 to 30 MHz) or extended subsplit (5 to 40 or 5 to 42 MHz) | 6.4 MHz |
| DOCSIS 3.0 | 5 MHz to 85 MHz | 0.2 MHz to 6.4 MHz |
| DOCSIS 3.1 | Upto 204 MHz (Maximum) | Scalable between 6.4 MHz and 96 MHz |
| DOCSIS 4.0 | • FDX: 5 to 85 MHz and 108 to 684 MHz • FDD high-split backward compatibility: 5 MHz to 204 MHz • FDD UHS : 5 to 85 and 108 to xxx MHz, where xxx = 300, 396, 492, or 684 MHz. |
