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• #17934 korcsi veterán farkas63 #17933

  Új Válasz 2020-05-20 22:23:33 #17934

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  korcsi

  veterán

  válasz farkas63 #17933 üzenetére

  A fel irányban a teljesítmény picit magas, de még belefér, amúgy rendben van, mindig csak két feltöltési csatorna volt?

  (#17935) farkas63: Az majdnem nulla.

  Infó:
  "
  Downstream (Rx) Signal Levels:
  This is the amount of signal received by the modem from your ISP. For all modems DOCSIS 3.0 / 3.1:

  -7 dBmV to +7 dBmV are "Recommended" values.
  -8 dBmV to -10 dBmV / +8 dBmV to +10 dBmV are "Acceptable" values but out of spec from ISP. A technician should still fix this to get to recommended levels.
  -11 dBmV to -15 dBmV / +11 dBmV to +15 dBmV are "Maximum" values but out of spec from ISP. A technician should still fix this to get to recommended levels. It is strongly recommended for you to force ISP tech to fix it since your power levels are close to edge.
  Lower than -15 dBmV & Higher than +15 dBmV are out of DOCSIS 3.0 specifications and modems may not work at all or cause lot of problems
  SNR (signal to noise ratio) levels:
  This is how clear the signal is at the modem receiver (downstream SNR) .

  DOCSIS specifications list minimum CNR (carrier to noise ratio) levels not SNR levels. The SNR levels listed here are based on commonly recommended MER levels for digital cable signals.

  256 QAM: 30 dB minimum. 33 dB or higher is recommended. Most ISPs run 256-QAM in downstream.
  64 QAM: 24 dB minimum. 27 dB or higher recommended. Some ISPs have 64-QAM in downstream but rare
  16 QAM: 18 dB minimum. 21 dB or higher recommended. It is very rare for ISP to use 16-QAM on newer DOCSIS 3.0 networks.
  QPSK: 12 dB minimum. 15 dB or higher recommended. It is very rare for ISP to use QPSK as performance on this modulation is very low.
  Upstream (Tx) Transmit Power level:
  This is the amount of signal transmitted by the modem to reach the receiver in the cable company head-end. This is a problem in most homes and most common cause of internet disconnects.

  These are generic recommended power levels

  *Recommended Upstream signal levels are +35 dBmV to +49 dBmV (DOCSIS 3.1)
  *Recommended Upstream signal levels are +35 dBmV to +49 dBmV (DOCSIS 3.0)

  However, Upstream power levels depend on number of upstream bonded channels and type of upstream modulation (64-QAM, 16-QAM, etc). Most ISPs use either 3 or 4 bonded channels and are mostly 64-QAM.
  "
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