When this is flashing, this is where the cable modem is getting its config file and date/time from the head end router. Lastely you have the "online" light, which is the real kicker. Same for the send light, if the modem can't get enough signal from the head end router. If the router can not get enough signal for the modem to stay locked on, you will get a continus blinking receive light. It is talking to the head end router, negotiating the amount of signal needed for the modem to stay locked on. When it is blinking, the same thing happens as on the send light. This is where the cable modem is talking back to the head end. This is where you get the downstream signal level. When it goes solid, it has found the correct amount of signal needed to stay locked on. When it is blinking the cable modem is talking with the head end routher negotiating the about of signal needed to lock on. You have a "send" light which will blink then go on solid. When a cable modem comes "online" it goes through a series of testes per se. I work for a Cable ISP (network admin) so i have to know how this stuff works, kinda hard to explain in one shot thou lol.Ī cable modem operates at 65-850mhz (downstream) and 5-42mhz (upstream). Now I dont know much about this, but I think the signal to noise ratio looks high, because last time they came I think they said it was around 40 in our upstairs. The Downstream Power Level reading is a snapshot taken at the time this pageįrequency Plan North American Standard/HRC/IRC This is what the Modem says about the connection. The modem we are using now is a Motorola SBG900. Now low and behold its back to its old antics, the modem wont lock onto a signal at all it will sit there flashing recieve over and over, it takes many restarts to get it to connect and it will disconnect only after a few hours. All is well for a while, we setup a wireless router to reach all parts of our house. So our solution to having to move our cable modem to get it to work was to put it on the closest jack to where our cable comes in. When the guy was at our house he said comcast uses channel 71 for the internet, well anything around 71 in our upstairs is way fuzzy so I could see why it does not work, but it did work before which was odd because before anything around 71 still was fuzzy, so I think they changed the signal. Which makes me think when they did there matenance they changed the way the signal came. The guy used this line tester and said he wasnt even getting a signal where he was testing it, I told him that it worked for a year where it was, and he said the way our house was wired he was surprised it worked in our upstairs (old house many cable splitters, old crappy cable) and it really shouldn't have. So I call comcast, they send someone out. I have had comcast internet for quite a few years, at first our cable modem (different one than what we have now) worked all over our house, then one day our internet went out, we called comcast they said they were doing matenance and it was fine, but still after a couple days it was not working.
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