DOCSIS 3.0 used frequency band 5 MHz to 65 MHz for upstream and 85 MHz to 1002MHz for downstream, whereas DOCSIS 3.1 allocates 5 MHz to 204 MHz for upstream and 252 MHz to 1788MHz for downstream traffic. There is also no reason why bandwidth optimization cannot be combined with bandwidth enhancement, yielding the best of both worlds. Is my modem broken? Learn about our DOCSIS Modem Policy for Charter Spectrum Internet and data subscription. ), the ability to deploy DOCSIS 3.0’s bonded channels, and headroom for new service offerings. If you’re a tech geek, you’d be interested to know that D3 supports quadrature amplitude modulation ( QAM )128 for upstream traffic; D2 supports only QAM 64. Downstream SNR (Signal to Noise Ratio) refers to the signal being sent in relation to the noise on the line. A cost-effective increase in the available RF spectrum (252 MHz of new spectrum in a 750 MHz plant! The power level on all downstream appears to be good (1.5-3.3). Something's up there. My modem is a fairly new Cisco DPC3008. 3.1 allocates higher frequency spectrum for downstream and upstream data transfers. The memo set forth a “balanced, forward-looking, flexible, and sustainable approach to spectrum management” that includes the development of a new National Spectrum Strategy. This document describes how to check the three signal levels to be within the acceptable level for the modem operate properly. This means your modem found the frequency with which to receive information from the internet. However, the power level on 1 of the upstream is 0. Downstream* • Frequency Range: 258MHz-1218MHz • Capture Bandwidth: 1.218GHz • Modulation: 64 or 256 QAM •and OFDM: up to 4096 QAM • Maximum DOCSIS 3.1 Data Rate: •2 x 192MHz OFDM • channels provide capacity up to 5Gbps • Maximum DOCSIS 3.0 Data Rate: 32 downstream channels provide speeds up to 1372Mbps • Symbol Rate: 5361 Ksps An agreement was reached in the standards organizations on using frequency division multiplexing with four frequency bands (two for upstream and two for downstream) in the138-kHz-to-12-MHz frequency range. Your downstream go from 4.4 to 9.9 with SNR from 35.5 to 37.6. To illustrate, D3 spectrum spans 108 MHz – 1.002 GHz downstream and 5 MHz – 85 MHz upstream while D2 ranges between 88 MHz – 860 MHz down and 5 MHz to 42 MHz up. Also, the signal to noise ratio is 0 on one of the downstream channels (between 38.3 and 39.0 on all others.) Acquire Downstream Channel: This should say "Locked", "OK" or similar. My signal levels are all below 5, +/- 1, on the downstream with SNR a rock solid 38 across all channels. It has 8 downstream and 4 upstream channels. Check all of your wiring, inside and out, for frayed wires and loose connectors. NETGEAR DOCSIS 3.1 products The first-generation VDSL standard specified both quadrature amplitude modulation (QAM) and discrete multi-tone modulation (DMT). Upstream Power refers to the line signal from the cable modem to transmit data back to the cable provider. National Spectrum Strategy On October 25, 2018, the President signed the "Developing a Sustainable Spectrum Strategy for America’s Future" Presidential Memorandum. Downstream Bonded ChannelsChannel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 QAM256 465000000 Hz8.4 dBmV45.1 dB002 QAM256 417000000 Hz7.3 dBmV44.5 dB003 QAM256 423000000 Hz7.2 dBmV44.4 dB004 QAM256 411000000 Hz6.6 dBmV44.0 dB005 QAM256 585000000 Hz7.0 dBmV43.4 dB57356 … The details of the spectrum allocation are yet to be firmed up. There should always be at least 1 channel acquired with a DOCSIS 1.1 or 2.0 modem. A VDSL connection uses up to seven frequency bands, so one can allocate the data rate between upstream and downstream differently depending on the service offering and spectrum regulations. fc1 is carrier for downstream ( that is cable modem receives on this frequency) fc2 is carrier for upstream ( that is cable modem transmit on this frequency) When u1 has to some data such as e mail to send across internet, it will use fc2 to send email to email server on internet. The FEXT noise is the major crosstalk impairment. 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