 owlynPremium,MVM
join:2004-06-05
Newtown, PA
 ·Comcast
| [Connectivity] Just Got Blast - How Are My Levels? I ask because I was having random disconnects with the old modem on Performance tier (Arris 602). I am hoping it was a modem problem and not a signal problem. So... here is what I have now on the 722G. |
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 gar187erI do this for a living
join:2006-06-24
Dover, DE
kudos:4 | could be better....-8/51 isnt what i would strive for....if you can bypass one splitter it would have much more favorable signal....and might clear up some of those downstream eerors your counters are showing.
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I'm better than you! |
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| reply to owlyn
gross
i mean it will work
but it's not pretty |
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owlynPremium,MVM
join:2004-06-05
Newtown, PA Reviews:
·Comcast
| reply to gar187er
Can't really remove a splitter. There are only two, and there's only one that could even remotely be a candidate for removal, but that would leave the guest room without TV. I suppose I could remove it and replace it with a barrel until we need the room, but it would be a pain. It's working, so I guess I'll let it be. If I drop back to the Perfomance tier, would the numbers get better or stay the same? |
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JoelC707Premium
join:2002-07-09
West Point, GA
kudos:5 | Ideally, and especially with those levels, you want two splitters. A 2 port at the main incoming line with one port feeding the modem and the other port feeding the next splitter. The next splitter will be as large as need be for your TV outlets.
Assuming you have a 4 port or so splitter, you are likely losing ~7 dB if not more since this is on a second splitter that is likely after the first. By putting the modem on a 2 port first you could potentially bring those downstream levels up to around 0 dB but the actual figures will depend on what actual splitters you have in place and their respective loss levels (such as a balanced or unbalanced splitter). |
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owlynPremium,MVM
join:2004-06-05
Newtown, PA Reviews:
·Comcast
| said by JoelC707:Ideally, and especially with those levels, you want two splitters. A 2 port at the main incoming line with one port feeding the modem and the other port feeding the next splitter. The next splitter will be as large as need be for your TV outlets.
Assuming you have a 4 port or so splitter, you are likely losing ~7 dB if not more since this is on a second splitter that is likely after the first. By putting the modem on a 2 port first you could potentially bring those downstream levels up to around 0 dB but the actual figures will depend on what actual splitters you have in place and their respective loss levels (such as a balanced or unbalanced splitter).
Unfortunately, I can't do that. I have an unbalanced three way splitter feeding the various parts of the house. The strongest leg (-3.5db) comes up to the next splitter, which is balanced, and half goes to the modem, the other half to the guest room TV. So my total loss is at the modem is about -7db.
I reset my error counters several hours ago, and things seemed to have settled down. Above are the latest stats (I don't know how to put the picture after the text). The numbers before were the total from the time of install, re-provisioning to Blast, and running a few ShaperProbes. The latest numbers reflect normal surfing, etc. Don't know if any of that makes a difference. I had the tech check my signal levels, and he said everything was good, but who knows... That's why I ask here.
On the up-side, I definitely have native IPV6 now. |
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andyrossPremium,MVM
join:2003-05-04
Schaumburg, IL | reply to owlyn
For 3-upstream bonding, the limits are 51 for 64QAM and 52 for 16QAM. You are at those limits and could have issues. |
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owlynPremium,MVM
join:2004-06-05
Newtown, PA
1 edit | As of this morning, I was back to one upstream 64QAM. |
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| How are your speeds? If those are fast enough, there's probably not too much to worry about.
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»Music2pc-This program is AMAZING! |
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owlynPremium,MVM
join:2004-06-05
Newtown, PA Reviews:
·Comcast
| Funny you should ask. Just finished:
Speedtest.net: 52.91 down, 10.27 up, ping 13
Shaperprobe:
DiffProbe release. January 2012. Build 1008.
Shaper Detection Module.
Connected to server 72.26.217.87.
Estimating capacity:
Upstream: 10756 Kbps.
Downstream: 94301 Kbps.
The measurement will take upto 2.5 minutes. Please wait.
Checking for traffic shapers:
Upstream: No shaper detected.
Median received rate: 10528 Kbps.
Downstream: No shaper detected.
Median received rate: 52453 Kbps.
Guess I shouldn't worry about it... |
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| reply to owlyn
OP's signals are almost identical to mine, and I have a similar modem (702G vs 722G.) I've never had a problem at these numbers; 62/15 speedtests all day long. |
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 JeepMattC'mon the UPremium
join:2001-12-28
Wilmington, DE
kudos:2
·Comcast
 ·Verizon FiOS
| reply to owlyn
Owlyn-
Downstream and SNR are tolerable, but as everyone stated, your upstream is at the limit.
It's most likely why you are dropping bonding - usually there are some exterior issues leading to that high of a level that a line tech could fix.
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"ONE team - ONE city - ONE dream!!" |
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 DarkLogixTexan and ProudPremium
join:2008-10-23
Baytown, TX
kudos:3 | reply to owlyn
Put the CM on the 3.5 leg, and put whatever splitters you need on the others. |
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owlynPremium,MVM
join:2004-06-05
Newtown, PA Reviews:
·Comcast
| said by DarkLogix:Put the CM on the 3.5 leg, and put whatever splitters you need on the others.
I can't without rewiring. |
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owlynPremium,MVM
join:2004-06-05
Newtown, PA | reply to JeepMatt
Jeepmatt
Thanks. My speeds are good for now, so I may just wait to see what happens. |
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owlynPremium,MVM
join:2004-06-05
Newtown, PA | reply to JeepMatt
Ignore this post. |
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JoelC707Premium
join:2002-07-09
West Point, GA
kudos:5 | reply to owlyn
You would only gain approximately 3.5 dB anyway. It may be that little bit that makes the difference though. I do understand wiring issues. The house I lived in out in Tucson was a mess. All the cable lines ran across the roof (yeah, up and over in hot Tucson sun) and it looked like the original installer used scraps as every run had at least 1 if not 2 barrels in it.
Maybe they just had a LOT of accidents up there and damaged nearly every cable run in different spots but I'm leaning towards using up scraps instead. Maybe it was the homeowner instead? Shrug, I was renting so I did what I could to clean it up and keep my levels decent. |
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DarkLogixTexan and ProudPremium
join:2008-10-23
Baytown, TX
kudos:3 | reply to owlyn
said by owlyn:said by DarkLogix:Put the CM on the 3.5 leg, and put whatever splitters you need on the others.
I can't without rewiring. Well looks like some re-wiring is needed then |
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| reply to andyross
said by andyross:For 3-upstream bonding, the limits are 51 for 64QAM and 52 for 16QAM. You are at those limits and could have issues.
This is wrong.
»[Connectivity] Intermittent connectivity - upload power @54 dBmV
That said we can pretty much forget about qam 16 versus 64, as the qam 16 carriers can now be bonded with 64 carriers in D3 bonding, so the reality in the physical world is
54 for it all, and the company wants 51 so they have play room so when the cable goes from 45F to 85F temperature wise in the day, it can gain a little return and the modems stay on line. No one calls in and says my return is 53 I need a service call, instead they call in when the modem goes off line. Let me correct that none that's normal, we have some loons at this board who have called in for return values, but.. I am pretty sure they got nothing out of it. That's the way cable works things are dynamic not static out there in the physical world, one minute its 85 degrees and blistering sunny, the next its 55 and raining, pulling all the heat out of any objects it hits, and when that happens, things contract and expand as mother nature intended them to do. Same with your computer when you turn it on and off, which is why there is the decades old debate about whether its better to leave it on all the time or not. Which is about equivalent in importance to the "are my signals ok" after an install that is working. |
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andyrossPremium,MVM
join:2003-05-04
Schaumburg, IL | This is in the actual specs that were posted awhile ago. 54dB is the limit for 2-channel bonding, and 51 for 3 or 4-channel. For 16QAM, add 1dB. |
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