Participant

Problems with channels on frequency 153.000

I had 2 TVs, one DVR and one DTA, and didn't notice any problems. Then I added a third TV with DTA replacing the input 2-way splitter with a 3-way (Ideal 85-333).  No problem with the DVR TV but I noticed that I had to set the DTA for the 2nd TV to automatic or 720p rather than 1080 or channel 6 would flash periodically. On the 3rd TV which has the longest run, I can't use any of the 4 channels that use freq 153.000. I get constant service outage messages. All other channels work perfectly. I looked at the DTA diagnostics when on channel 6 and saw the power level alternating between -1.70 and 49.30 and the signal to noise ratio between 37.1 and 4 million.  I tried a BAMF splitter  which I knew had a balanced output of 5.5db per port and then had pixelation on the other two TVs so I put the Ideal splitter back in.  Why am I having a problem just this frequency?

4 REPLIES
Expert

Re: Problems with channels on frequency 153.000

I assume the modem is on a 2 way before the 3 way. Copy and paste the modems signal level and error log pages. Don't reset it, need to see real history

 

Participant

Re: Problems with channels on frequency 153.000

My SB6141 modem is on a 2-way after the 3-way. 3-way feeds two DTAs and a fairly short run to the 2-way that feeds the modem and a DVR. I believe the signal levels are good in the modem. Haven't had any problems with it so far. Only issue has been with freq 153.000 on the TVs especially the one I added recently which I believe has the longest cable run..


 

Downstream Bonding Channel Value
Channel ID11 12 14 15 16 19 30 
Frequency507000000 Hz 519000000 Hz 525000000 Hz 537000000 Hz 543000000 Hz 549000000 Hz 567000000 Hz 633000000 Hz 
Signal to Noise Ratio38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 38 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
0 dBmV  0 dBmV  0 dBmV  0 dBmV  1 dBmV  1 dBmV  0 dBmV  1 dBmV  

 

Upstream Bonding Channel Value
Channel ID
Frequency37000000 Hz 24200000 Hz 30600000 Hz 19400000 Hz 
Ranging Service ID2773 2773 2773 2773 
Symbol Rate2.560 Msym/sec 5.120 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 
Power Level47 dBmV 46 dBmV 46 dBmV 46 dBmV 
Upstream Modulation[3] QPSK
[3] 16QAM
 
[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 ID11 12 14 15 16 19 30 
Total Unerrored Codewords1910970482 1890224988 1890248959 1890273558 1860583693 1860577551 1860576991 1860621701 
Total Correctable Codewords28 24 51 43 77 55 58 
Total Uncorrectable Codewords602 1222 1300 1167 1943 1883 1940 1911 

 

 


 

 

 

Expert

Re: Problems with channels on frequency 153.000

 Looks like ingress to me.

The modem shouldn't have that many skipped channels, from 507 -633 is a 126 mHz span and that exceeds the modems 96 mHz acceptance bandwidth.

There's probably ingress on a bunch of the skipped ones... Maybe 1/3 the freq's down in the 100-200 mHz range

 

Your setup needs twc out to clean it all up,

Spectrum Employee

Re: Problems with channels on frequency 153.000

Hmm... This node isn't loaded with ingress, the upstream carriers seem ok.  The channel plan may be correct, in spite of what MsRaye is hypothesizing...

 

There certainly seems to be an issue with the 153 MHz, however, which means it could be a cable plant issue (maintenance tech, or even hub tech).  We'd need to isolate that specifc EIA channel/frequency on the plan an check into it, on-site.  (can't do that part remotely over the phone)

 

@redsho1999 , you definitely should ask about scheduling a troublecall (field tech repair appointment workorder) for this ASAP!  If there's an issue with the plant on a specific area we'd definitely want to know about it.  Physical investigation on-site is required.  Please kindly ask the CSR (customer service representative) to notate the workorder with something such as: "possible issue with 153 MHz, please check DQI & for ingress under the QAM carrier".  Hopefully it's just a simple matter of a bad fitting or bad trap (if you have one) somewhere.

 

Please bear in mind that DQI issues with an isolated channel frequency when none of it's neighbors are affected is likely a fiber optic issue (hub tech) affecting many/all people in your neighborhood... so, if that's the case, it'll have to be escalated once or twice above the field tech.  So please be patient, as might take a day or two (at most).  Be sure to get backup contact information so if it's not resolved you'll have  a means of getting in a special request order without having to go back through the call center CSRs.

My postings on this site are my own, off-the-clock, and don’t necessarily represent TWC’s/Charter's strategies or opinions.