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5 Δεκ 2018 · 0 dBmV is said to be ideal (a reference point). -15 dBmV is not really great (and should be avoided) and breaks more easily when noise is present. Your -12 dBmV is not a great value, but your...
Most cable modems are incapable of transmitting higher than 51 dBmV (upstream power). For example, I've read the specifications sheets for the Arris SB6183, SB6190 and TM822. They all have a maximum upstream power of 51 dBmV.
As for levels being different for different brands or models, for the most part, no. They are all based on what is called DOCSIS which is a standard across all modems/gateways. DOCSIS 3.1 added some things like OFDM to DOCSIS 3.0 and I think changed SNR to MER but those are small things.
15 Ιουλ 2018 · The upstream is 13db but that may be more that the cable company equipment can't tell the modem to go any higher. I would look for splitters in the cable first. Try to remove them and connect...
Downstream looks good. SNR is good. You want downstream power to come in as close to 0 as possible, but anything plus or minus 12dB tends to work. The upstream power is pretty high; your cable modem has to scream pretty hard to be heard by the CMTS and is probably nearly maxed out.
Based on the estimated plant loss and known CMTS input power, one can conclude that the DOCSIS 3.1 cable modem should be transmitting SC-QAM channels around 44.6 dBmV and the OFDMA channel around 35.4 dBmV.
I have a DPC2100R2 cable modem and wondering what the receive and transmit power levels should be. I am having problems with very slow speed now and it may be a signal level problem. Current level readings are Receive power level -2.6 dBmv and transmit 39.9 dBmv.
