Problems with channels on frequency 153.000

[redsho1999]

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?

[MsRaye]

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

[redsho1999]

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..

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Downstream Bonding Channel Value

Channel ID	9	11	12	14	15	16	19	30
Frequency	507000000 Hz	519000000 Hz	525000000 Hz	537000000 Hz	543000000 Hz	549000000 Hz	567000000 Hz	633000000 Hz
Signal to Noise Ratio	38 dB	38 dB	38 dB	38 dB	38 dB	38 dB	38 dB	38 dB
Downstream Modulation	QAM256	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	8	6	7	5
Frequency	37000000 Hz	24200000 Hz	30600000 Hz	19400000 Hz
Ranging Service ID	2773	2773	2773	2773
Symbol Rate	2.560 Msym/sec	5.120 Msym/sec	5.120 Msym/sec	2.560 Msym/sec
Power Level	47 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 Status	Success	Success	Success	Success

Signal Stats (Codewords)Bonding Channel Value

Channel ID	9	11	12	14	15	16	19	30
Total Unerrored Codewords	1910970482	1890224988	1890248959	1890273558	1860583693	1860577551	1860576991	1860621701
Total Correctable Codewords	5	28	24	51	43	77	55	58
Total Uncorrectable Codewords	602	1222	1300	1167	1943	1883	1940	1911

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[MsRaye]

 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,

[agentx5 · Accepted solution]

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.