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JofCore
join:2004-09-15
Sebewaing, MI
| Questions about SB5100....
hello all! I recently purchased a SB5100 cable modem off ebay. I was intending to get a 5120 but apparently wrong modem was in the box... it was from a charity that had it donated to them so I don't think it was anything intentional. They were just selling it as they received it and didn't realize the difference (or that there was a difference - the box said 5120, modem inside is labeled 5100 - don't think they looked that closely).
Anyway, I got it connected and my ISP mucked around for a while and seems to have it working. However, I have a few questions that I'm not sure of the answers to 
First of all, things seem to be working well for the most part. However, last nite I was dropped offline for a few minutes for no apparent reason. Most of the time, it seems to be running well, and when I perform speed tests from various places, I can get my promised speed (3Mbps down, 384 up). There's just some info in the diagnostic counters that I'm not sure of... and I'm not sure if it indicates an error or if I'm being nit-picky 
OK, so first of all, the upstream power seems a little high to me. When I look @ the diag page @ 192.168.100.1, it's usually in the range of 50-58dBmV (sitting at 54-56 right now), and from what I've read, 58 is pretty close to the max allowable limit..
So I grabbed the DocsisDiag program to see if there was anything else I could see, and it seems to be racking up a few too many errors for my taste. However, I'm not at all sure if this is normal, or if it's something to be concerned about.
For example, I rebooted the modem last night around 2:30am (when it went offline). Since then, here is my error counters (read off it just a few minutes ago):
SigQu: received without error = 1668129844 codewords
SigQu: correctable errors = 61214105 codewords
SigQu: uncorrectable errors = 1652 codewords
That seems like a lot of "uncorrectable" errors to me... but as I said, I'm not entirely sure since I've never had to dig around inside a cable modem like this before
So if anyone has some insight into what this may mean, that would be great! I'm just trying to determine at this point if there's anything that I need to have my ISP "tune" any further or not... and if so, how to indicate what it is that needs tuning 
Thanx!
-kevin | |
Johkal
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2 edits | If your normal range was "50-58dBmV", there is your issue. Your upstream should be kept below 55dBmV and shouldn't slide that much as it appears to. Preferably, you should try to keep it between 35-52dBmV. If goes above 55dBmV, you can see disconnects.
Check all cables, cable connectors, and splitters for issues. Also if possible, you should have one splitter from when the cable enters the dwelling. One side to the modem and the other to a TV or additional splitter.
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JofCore
join:2004-09-15
Sebewaing, MI
1 edit | No splitters really...
But there is one other thing I forgot to mention that could be an important piece of information: this is a wireless connection. The cable from the cable modem goes to a little "power injector" and then goes from there to a wireless antenna mounted on the outside of my house. It's my understanding that the power injector provides power for the outside antenna... That's the only "splitter" type thing in the line though; no TV comes over the same line or anything, it's just for internet.
So I'm not sure if that has anything to do with the strange power readings or not, since it's not your "typical" cable modem installation Could that be why my values slide so much... due to the fact that my link is through the air..?
thanx for the reply, I will keep an eye on things, and possibly send a message to my ISP regarding the upstream power reading depending on what you and others think...
thx! | |
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