upstream power

4 Topics

Arris SBG8300 Upstream QAM Speeds.
I bought an Arris SBG8300 modem/router in one last June and upgraded to Gigablast. We've had several Cox techs to the house to narrow down the root cause of slow speed and intermittent connectivity issues we have. We have a new large gauge wire (11?) from the post in our yard to our house. From there it is a direct line (no splitters) to our Arris. So . I ran a speed test hard wired to the modem/router. Here are the result (23 DL, 33 UL...on gigablast 😞 https://www.speedtest.net/result/11076560076 When contacting Arris about the issue they seemed adamant that the Upstream power levels were the issue (all five approximately 34dbmv) as they are well below the minimum recommended of 45dbmv. They way I understand it, Cox should be telling the modem what upstream power it expects, so the issue could be that this specific model was spec'd out incorrectly in Cox's system. I say this after having had the issue with two of these same Arris's since last June coupled with the fact that the tech who saw this modem tonight acted like I had exposed electrical wires (anecdotal, but techs see a lot of different hardware, so I think there's possibly some good reason for his reaction). What're the forum's thoughts? I don't want to just buy more hardware as I have a hefty sum invested in this one and Arris is not exactly making it easy to get a refund. Thanks, Jamie
JHalverson 4 years ago Place Internet
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Coaxial cable wiring resources & Question
Hi all. I'm currently staying in a home that has been in my family for a few generations. I've been encountering issues with my internet connection recently that is leading me to believe that the wiring with the coaxial cable may require inspection and adjustment. The upstream LED flashes during boot up, and the modem goes offline to reconnect after 30 minutes of connection. A look at the status page of the model display this as the upstream variables: Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 2 Locked ATDMA 4 5120 kSym/s 38.40 MHz 57.00 dBmV Downstream appears fine but I can provide those if helpful. The coaxial cable was installed through the crawl space of the home and as of right now I'm not clear on the layout of the wiring job. I'm willing to believe the wiring was done in an effort to quickly have it done and over with. I am nota Cox Complete Care customer and I'm not certain if the cost would be worth while to have someone come and re-work the line so I can maintain solid connect.Would anyone be able to say if paying for the service would help the issue or would it be better to do-it-myself. Also are their any solid resources available that may help me with the job of ensuring the line going to the modem is good?
NoSoRiko 4 years ago Place Internet
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6Comments
Random upstream power spikes / Internet drops
I'm getting random internet drops due to fluctuating upstream power levels. Most of the time my upstream levels are fine (4 channels between 38-48db). 3-4 times a day at random times they will jump into the upper 50s and the internet times out for a few minutes, then the power levels return to normal. This is very annoying because me and my family due alot of online gaming with party chat on xbox and it cuts me off from everyone and disconnects me from the game. I have tried many different combinations of amps and/or splitters on the main coax line coming into the house to get the signal levels right and its always the same issue with the upstream power so i dont think its a problem on my end. I have a CM1000 modem.
Warren3000 5 years ago Place Internet
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Only 1 Up Channel Bonded & 51-55 Upstream / Bad Wiring or Buy Modem?
Modem: Netgear C3700-100NAS Connection: No spitters in the house. No TV. Modem combo is connected directly to the coax coming from the wall. Coax from wall is closest to the outside connection. Problem: I'm having some ongoing issues with my modem requiring frequent resets. I believe these problems to berelated tomy 51-55 dBmv and my only one locked bonded upstream channel. I believe this is a line problem, and not a modem problem Attempted Solution: Cox tech acknowledged my 51-55dBmv. The tech suggested that i buy a new modem because mine was more than 3 years old. I will post excerpts of this chat log below. Thetech offered to send a rented one to me. However, I discovered he modem came with a $20 self installation fee, so I refused this option. If the modem was the problem, i would rather usethat $20 to buy a NetgearCM600 or an Arrissb6183 and mate it to an Archer C or A7. Question: Does the tech's suggestion to buy a modem sound right to you?
RobertHP 6 years ago Place Internet
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