SB5100 Question

The time of my speed tests so far has been been negligeable. I find it really has no bearing on results. When I first discovered this issue it seemed to be worse during the day but lately it is very random night and day. While I do find Speakeasy fairly reliable I use others as well like:

Mostly I use WS-FTP LE to do my upload testing. I upload files to my Personal Web Space on Comcast. I figure that is the best way to gauge speeds anyway. I use the speed dialog shown during transfers to gauge my upload speed but also monitor using the small app NetPerSec. It allows for finer details. One of the things I see is during an upload NetPerSec will show the transfer actually stop for many seconds. It also shows the speeds fluctuating wildly during transfers during those periods when there is a problem. When my problem is not currently presenting itself my uploads speeds fly, averaging over 700 kbps. During these periods of bad upload speeds my download speeds usually do not suffer and speed tests show my downloads at or near my max of 6000 kbps.

I already posted my modem signals a little further up the thread. I've read all the stuff on BBR and go there often anyway. I am about 99% sure the problem is not at my house. My speeds have been good the last few days. I keep a log by the way. Today for what ever reason the issue cropped up again. This time I was ready. I had been performing Line Packet Loss Testing from BBR while my speeds were good. Once the speeds went bad I continued the testing and now I see a bunch of losses at my end. Now to verify it is not my equipment I moved my cable modem and a laptop outside my home and plugged my modem directly to the drop to my house bypassing all my wiring, even the splitter. Upload speeds continued to be bad and Line Packet Loss Testing from BBR still showed a problem. I called Comcast to see what they saw on the line as well. While on hold magically my speeds got better. While talking to the tech he did see problems on my end and my upload speeds again went bad. I continued the BBR testing during our phone conversation. I had number over 20% on my end. Holy cow.

Anyway I think the issue that throws most techs is that even though those periods where my uploads speeds are crap, my downloads speeds remain unaffected. Today the tech offered the idea that I might have a Line Balance issue. I have another technician showing up on Friday and the issue has been elevated. Matter of fact I was told to ask for a supervisor if not satisfied.

One thing I have noticed that I do not like is my modem downstream power level is varying from -6 dB to -11 dB. I have read the a variation of more that about 2 could mean trouble. It typically averages at around -8 to -10 with day to night flucuations however I am seeing those other numbers as well. My downstream SNR and upstream Power Levels are very consistant. though.