computergeek
join:2003-12-14
Gaithersburg, MD
1 edit |  [Connectivity] Lots of errors in SB5100 log
I have connection problems to comcast HSI on an off and was wondering if the errors in the logs mean anything? Currently my connection has been stable for two months.
I have had Comcast out to the house a number of times and they check the connection coming to the house and say the signals are fine. But, when I connect the modem in the house using the house wiring, I can not use a splitter to have a TV and the modem hooked up at the same time or I lose the modem connection.
I can run a line directly in my window from the feed into the house using a splitter but am not sure this will help.
Any thoughts are appreciated.
thanks
steve |
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Cabal
Premium
join:2007-01-21
Boston, MA | Your upstream power level is much too high and no doubt responsible for the errors and flaky connection when split. I'd call Comcast. |
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jay608
Going Nucking Futs
join:2007-01-22
Chicago, IL | reply to computergeek
Yes call comcast. Depending on what splitter you put in, it might damper you Downstream SNR / power lvl. |
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EG
Ho Ho Ho
Premium
join:2006-11-18
Union, NJ
1 edit | said by jay608  :Yes call comcast. Depending on what splitter you put in, it might damper you Downstream SNR / power lvl. The O.P.'s issue is with their UPL as it is borderline / out of spec, whereas, their DPL has a bit of elbow room.
A splitter will "attenuate" both the DPL and the UPL equally, and may affect both the upstream and the downstream SNR if it is a source of ingress / noise. |
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computergeek
join:2003-12-14
Gaithersburg, MD
| Thanks. I bought the best splitter Radio Shack had (it is Gold colored). Any suggestions on what/where to get a better one?
I called Comcast and they "checked" the modem from their end and said everything is within specs. They say 55dbVm UPL is "within range" so they see nothing wrong.
Now I have to figure out how to elevate this so someone comes to the house and checks the level, but I do not have high hopes.
Thanks for the help. |
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EG
Ho Ho Ho
Premium
join:2006-11-18
Union, NJ
4 edits | 55dB is borderline for some modems, totally out of spec for others. One must also factor in the accuracy of any particular modem's measuring mechanism... This can vary by a few dB..
A equally important factor is how stable one's power levels, and their SNR are. They may look acceptable at any given time but you have to keep in mind that these figures may be fluctuating farther out of spec intermittently..
I.M.O. you can do way better than a Radio Shack splitter, although it may very well be true to its specs..
These are the ones that Comcast uses in my area:
»www.yourbroadbandstore.com/produ···ters.php |
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rileydag
join:2007-08-06
Decatur, GA
| For the past 10 months I have been having the same issue. Comcast has been out to my home more times than I care to remember. To date, Comcast has done the following:
* Replaced the wiring from the distribution point in our building to our Condo, twice.
* Replaced the wiring in the Condo from the junction point to the outlets, twice.
* Replaced all wiring from the outlets to the two TV's and the Cable modem, 4 times.
* Replaced the 2 splitters, 3 times.
* Installed Directional Taps and replaced them 5 times.
* Installed a powered signal booster on our line at the junction point in our Condo, replaced it 3 times.
* Replaced the modem 6 times (most recently on 9-9-07)
For reference, our building is 4 years old, all the cabling in the community was installed originally by Comcast. We had cable and cable internet service turned on when we moved in on June of 2004. Everything has been fine up until 10 months ago.
Now, I am scratching my head. If you replace everything in the home, your problem should be fixed, right?
Any ideas where the problem may still lie?
I have a Motorolla SB 5120, signal stats:
Downstream:
Frequency 615000000 Hz Locked
SNR 36 dB
Power Level 5 dBmV
Upstream:
Channel ID 3
Frequency 30000000
Power Level 51 dBmV |
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