Re: What are normal signal levels?

It's just the upstream power that is too high. The downstream values are good.

You should get the techs re-involved, especially if you were told that the problem lies beyond your premises,

Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may indeed lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.
Good luck !

Yes. There is no wiggle room to allow for inevitable fluctuations. 40 to 45 dB would be the desired value.

The downstream power is o/k bit you didn't post the SNR values.

You'll have to keep leaning on them. The wheels turn very slowly.

The employees on this forum confirmed the tech on 1/30/21 did refer it to the maintenance team, but said I must wait 14 days for them to fix the problem. The 14th day is on Saturday. 

The on-site Tech did climb the pole and verify with his meter (and my house disconnected from the pole), that the upstream signal was too high. Nothing to do with my home as he experienced the same issue at the pole. 

We are having various issues because of it.  

Maintenance and a tech came out. They adjusted the pole and checked my internal wiring. Everything is now within spec. Speeds are exceeding what my plan offers up and down.

Here are the new levels:

https://imgur.com/a/EBTYR6s 

That is if they remain rock-solid stable (which they won't). And what you posted are not the Comcast plant / system specs. They are the only ones that matter. I guess you didn't see the point that I was making about the inevitable fluctuations, and there is not any wiggle room to allow for it... 40 to 45dB is the desired safe range.

FWIW, the upstream power is still too high. There is no wiggle room to allow for the normal inevitable signal fluctuations. Especially when the warmer Summer weather arrives as the outside temperature will indeed cause it to rise. It's a problem waiting to happen.

Hope things hold up for you. Good luck !

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@EG wrote:

FWIW, the upstream power is still too high. There is no wiggle room to allow for the normal inevitable signal fluctuations. Especially when the warmer Summer weather arrives as the outside temperature will indeed cause it to rise. It's a problem waiting to happen.

 

Hope things hold up for you. Good luck !

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Why would they tell me it is fine then? Literally, had a pole truck and another Xfinity tech claim I am good. They even said the modem is reporting 50/51.  

Quick search seems to show it is below maximum allowable levels (I assume the bold one is my signal): 

50 dBmV maximum for OFDMA (DOCSIS 3.1)
52 dBmV maximum for A-TDMA, TDMA & SC-QAM (DOCSIS 3.0)
53 dBmV maximum for S-CDMA DOCSIS 2.0 (All Modulations)
54 dBmV maximum for 32 QAM and 64 QAM. (A-TDMA DOCSIS 2.0)
55 dBmV maximum for 8 QAM and 16 QAM. (DOCSIS 1.0, 1.1)
58 dBmV maximum for QPSK. (DOCSIS 1.0, 1.1)

What should my Signal Levels be? Comcast High Speed Internet FAQ | DSLReports, ISP Information

Is the modem on the -3.5dB port of the first splitter ?

I believe it is, but can double check by disconnecting it.

It is possible it is the main DVR, but I am not sure. If it is the main DVR, will that have the DVR then have signal issues or they more tolerable? 

Would an amp fix it? I don't have an amp. My connection comes into the side of the house, runs about 2 feet to the splitter. The Modem and DVR are on the main splitter from the drop. The first splitter has 1 in and 3 out. The 3rd port on the first splitter splits to the two satellite boxes (XiD). on the second splittrer. I really don't see how any reconfig of this will improve the upstream signal. 

What is the "spec" where it if it exceeds I will have issues? If anything, extreme cold made it worse and it is still the same temps since the techs repaired the pole connection. 

For the last two weeks, the service has been rock solid. My 600meg plan is bringing 720meg down and 18meg up. 

Splitter config: https://imgur.com/f6SFnTS

@EG So the 3.5db leg of the first splitter goes to the second splitter with the secondary XiD Boxes. The modem and DVR are on the -7db leg of the first splitter. 

Line Tech said the pole was sending 42. If the modem is on a 7db loss leg then 42 + 7 = 49db to the port. I am pulling 50db so I am sure there is some minor loss in the run.

Any advice here? 

@EG the two boxes on the second split are the ones without tuners that use the XG1v4 to work. I believe they are called XiD X1. Correct me if I am wrong, but I thought those boxes use MoCA to connect to the main box and do not care about outside signal levels?

SIGNALS AFTER CHANGING SPLITTER: https://imgur.com/a/1RkREd2

I would experiment and put the modem on the -3.5 port of the first splitter and the second splitter on a -7dB port of the first splitter and see how the performance of everthing is Be advised that this may be too much loss for the TV stuff but you won't know until you try the test.

Or you could get a zero loss drop amplifier that also has what they call an *active return*. This type boosts the upstream which is what is needed in your case. You can purchase one at retail but it is Comcast that actually should supply it for free if you can convince a premises tech that that is what is needed.