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DOCSIS RF frequency Range Bandwidth | Downstream,Upstream

This page mentions DOCSIS RF frequency Range and Bandwidth for different DOCSIS versions. It mentions DOCSIS frequency range and bandwidth used by downstream traffic and upstream traffic.

What is Frequency Range and Bandwidth ?

Frequency range : The range of frequencies which can be used by wired or wireless device for modulation of baseband information and consecutive transmission over the transport medium. It is the part of EM spectrum from few KHz to just below IR (Infrared) light frequency range. Refer What is RF >>.

Occupied Bandwidth or Channel Bandwidth : The total sum of channel frequencies used by the device including channel spacing is known as channel bandwidth or occupied bandwidth.

DOCSIS frequency Range and Bandwidth for Downstream

Following table mentions DOCSIS frequencies and bandwidths used in downstream direction from CMTS (Cable Modem Termination System) to 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 egde 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

Following table mentions DOCSIS frequencies and bandwidths used in upstream direction from CM (Cable Modem) towards CMTS (Cable Modem Termination System) side.

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.

Refer DOCSIS network architecture >> and benefits of DOCSIS standard >>.



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