Valued Participant

How is it possible...

Backstory:  SB6141, only getting 5MbpsPlease get rid of ATS , and Here we go again

 

I've been running fine for almost exactly a year (last problem was 11/16/2016).  But "it's back" said in my best Jack Nicholson voice.  Downstream Channel 6 went south today, Download speed 4 Mbps, SNR is 28db on downstream 6.  I know it's an ingress problem, but I tried to reset the modem a few minutes ago anyway, hoping it would pick up a different channel, but no joy. 

 

I really don't have the energy to deal with TWC right now... (is Spectrum any better, or is it same story, different name).

 

 

DownstreamBonding Channel Value
Channel ID10 
Frequency693000000 Hz 657000000 Hz 663000000 Hz 669000000 Hz 675000000 Hz 681000000 Hz 687000000 Hz 711000000 Hz 
Signal to Noise Ratio34 dB 36 dB 36 dB 36 dB 36 dB 36 dB 28 dB 36 dB 
Downstream ModulationQAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
-7 dBmV  -7 dBmV  -7 dBmV  -8 dBmV  -8 dBmV  -7 dBmV  -7 dBmV  -8 dBmV  

 

UpstreamBonding Channel Value
Channel ID18 20 19 17 
Frequency24200000 Hz 37000000 Hz 30600000 Hz 19400000 Hz 
Ranging Service ID9662 9662 9662 9662 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 
Power Level45 dBmV 46 dBmV 46 dBmV 44 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID10 
Total Unerrored Codewords110715477 110726210 110707203 110734397 110699730 110701229 36671986 110703734 
Total Correctable Codewords2527 13 45 66146481 
Total Uncorrectable Codewords632 592 1420 592 1533 1525 7886665 1544 

 

21 REPLIES
Expert

Re: How is it possible...

First of all, the DS levels are too low, your modem is on too many splitters and or open ports or chewed up/ corroded outside line/ connectors. You have broadcast TV ingress.

 Resetting the modem won't fix this, plus over time, it will get worst.

 If you're internet only, there should be no splitters and DS should be in the 0 to + 10 dBmv range

a 2 way splitter will drop that level by 3.5 dB, the other port should only be split to the exact number of cable boxes you have.

Also some ups/surge outlet strips have NO shielding and allow all sorts of ingress and noise in.

 

 

 

Valued Participant

Re: How is it possible...

MsRaye,

 

You've educated me so much over the last year or so (see backstory posts)... I thank you for all your help.  I'm aware that I have broadcast ingress from my local PBS station and that I need a truck roll. 

 

I am internet only, no splitters, I come from TWC's block on the side of my house directly into the modem.  I have already broken/reconnected all the interior and exterior cable connections.  Power is connected to APC Back-UPS, which I would hope is shielded.

 

For the most part... I'm just whining right now because I don't have the time or energy to deal with Customer (non)Support, or the follow-up disaster of ATS.

 

 

Expert

Re: How is it possible...

only the UPS coaxial "F connector surge protecter" feed thru is an issue, not the ac power.

 This sounds like a tree or tree rodent/raptor damaged line which has allowed water in and some of the shield is scraped or chewed off, especially if the drop runs thru trees.

 There should be no internal, inhouse connectors, as in line splices.If there's a wall plate, make sure the connector on the backside and all others are compression, not hex crimped and a tad more than finger tight.

 Look back at last years levels? You had +5 on all and now it's at -8 yet US is still at +45 dBmv!

5 dBmV  5 dBmV  5 dBmV  6 dBmV  6 dBmV  6 dBmV  6 dBmV  6 dBmV  

  If so it's water into a chewed up outside line. Both high loss and ingress, I've seen some where a foot was rubbed off from a tree branch!

How far are you from the pole tapoff? Is it overhead or underground? Undergrounds will have issues with those ground squirells chewwing up the lines as well as pacrats in tx, they'll even chew up plastic conduits to get at the cables inside.

 

 

 

Valued Participant

Re: How is it possible...

I'm not using the APC F Connector Surge protector.  I'm only getting AC from the APC.  The Coax is running directly from the TWC block on the outside of the house, through the wall, and dead ends at the modem.   No splices, no splitters inside, all connectors (inside and out) are good and outside line is overhead.

 

Comparing current levels to last year and they are pretty much identical.  DS Channel 6 was 28db last year, and is back at 28db now.  My problem disappeared last year when my modem stopped trying to use channel 6.  Today it pulled in channel 6 and went back in the toilet.

 

 

 

Expert

Re: How is it possible...

Look at the RF levels... -8 is way too low with no splitters! you had +5 last year.

 

Valued Participant

Re: How is it possible...

gotcha...  never looked at that before, what is a good number with no splitters?

Expert

Re: How is it possible...

0 to +10with no splitters and 20-100' from the tap with RG6 coax.. You had +5 last year, something has degraded. Does the overhead line run thru trees?

 

Valued Participant

Re: How is it possible...

The overhead line from the pole passes by one tree, otherwise it is clear.  It is over 100' though... I just measured it on Google Maps aerial and it comes out to be close to 225' (not sure on the coax size, will look at it tomorrow)

Valued Participant

Re: How is it possible...

SMH... As of this second, speed is 43Mbps on a 60Mbps line, not great, but not 4Mbps.  The modem is still pulling downstream channel 6, but SNR is up to 30 db.  Power is still -7.

 

I know what's going to happen, I'm going to go through the pain of customer support when it slows down again, they will schedule the truck roll, I'll have to deal with ATS and then it will be magically working when the truck shows up.

 

DownstreamBonding Channel Value
Channel ID10 11 
Frequency663000000 Hz 681000000 Hz 687000000 Hz 693000000 Hz 699000000 Hz 705000000 Hz 711000000 Hz 717000000 Hz 
Signal to Noise Ratio36 dB 36 dB 30 dB 34 dB 37 dB 37 dB 36 dB 36 dB 
Downstream ModulationQAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
-7 dBmV  -7 dBmV  -7 dBmV  -7 dBmV  -7 dBmV  -7 dBmV  -7 dBmV  -8 dBmV  

 

UpstreamBonding Channel Value
Channel ID18 20 19 17 
Frequency24200000 Hz 37000000 Hz 30600000 Hz 19400000 Hz 
Ranging Service ID10214 10214 10214 10214 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 
Power Level45 dBmV 46 dBmV 46 dBmV 44 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID10 11 
Total Unerrored Codewords755874439 755882751 258697666 755255188 755858998 755857620 755857892 755860117 
Total Correctable Codewords24 40382795 587811 10 16 17 17 
Total Uncorrectable Codewords607 485 4264698 48810 612 633 1538 1533