Hi, we are having very slow (2/20 Mbps on 300/20 plan.....) and have had several fruitless chat sessions and one tech visit. When the tech was here, he was able to get 250Mbps while being directly plugged in to the model, but I never got more than 150, and usually 20 or less. Upload is consistently around 20Mbp, what it should be. I finally figured out how to get the info off the modem and it looks like several channels are not connected at al, and some others seem to have many errors, but I am not sure how to read this info. So in case anyone does understand, here it is. I have another tech visit due tomorrow, but I want to be as informed as possible when they get here, so I don't need a third visit. Are there some obvious points of failure that this info gives? Thanks in advance!
Oh, it's a Netgear CM500 modem. Previously had an Arris 6183, same problem. All connected to an Airport Extreme, but the problem is the same when plugged directly into the modem.
|Upstream Bonded Channels|
You have a MAJOR signal level and broadcast tv ingress noise issues, looks like there's splitters in line with open ports. Maybe badly corroded connections and chewed up outside line as well.
The modem must be directly connected to the outside grounding block if you're internet only. All connectors must be shiny and a tad more than finger tight.
If you have cable tv. the modem must be on the first 2 way splitter with any boxes split off it's other port.
Whatever the first tech didn't fix is tthe issue which is coaxial not modem related.
1) Print a copy of these signal levels so you can show the tech when he arrives, even if Spectrum 'accidentally' resets your modem and clears all the log messages.
2) Point out the SEVEN missing DS channels [17, 18, 19, 21, 22, 27, & 28]. These all show SNR (Signal to Noise Ratio) of 0.0
3) Point out another FIVE DS channels with SNR below the minimum acceptable value of 34 dB [20, 23, 25, 29, & 30].
4) Show the tech that all four US channels are running above 51 dBmV while the maximum power allowed is 50.
5) Ask the tech how your modem is supposed to work with only FOUR of 16 DS channels at a proper working level. Tell him his job today is to get them all above 34 dB SNR as measured by your modem, or provide a credit on your monthly bill until they are compliant. FWIW, it takes four good bonded DS channels just to make a working 60 Mbps connection.