Ideal Signal levels for Ignite TV

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I'm a Reliable Contributor
Posts: 390

Ideal Signal levels for Ignite TV

I just wanted to know what the ideal signal levels should be for Downstream and Upstream SNR, Power Level.  This article gave me some ideas but I figure I rather ask the experts at Rogers:

https://pickmymodem.com/signal-levels-docsis-3-03-1-cable-modem/

 

Also, I have index 1 and index 33 with the following values:

 

Index 1 and 33

Unerrored Codewords

2544931327

Correctable Codewords

1454846970

Uncorrectable Codewords

66

 

How would I fix that?

 

 

**Labels Added**

 

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Resident Expert
Resident Expert
Posts: 7,012

Re: Ideal Signal levels for Ignite TV

@Alex4161 you would have to post the whole table to determine if there are any signal issues.  Can't do that with just one set of fields.  Its possible that nothing requires fixing.  

 

Ideally you would have the following for the downstream DOCSIS 3.0 channels:

 

Modulation:  QAM - 256

Signal level:  0 dBmV     Ideally 0 dBmV with values grouped around 0 dBmV.  

Signal to Noise Ratio:  36 to 40 dBmV

 

DOCSIS 3.1 (OFDM) downstream channels:  

 

Modulation:  OFDM  -  (QAM - 1024)   The QAM level won't be visible to the end user

Signal level: 0 dBmV

Signal to Noise Ratio:  36 to 40 dBmV  (??)

 

 

Upstream DOCSIS 3.0 channels :

 

Signal level:  36 to 40 dBmV      (You might have three or four upstream channels)

 

Note that the Hitron CODA-4582 typically runs in a 30 to 32 dBmV range for upstream signal levels

 



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I'm a Reliable Contributor
Posts: 390

Re: Ideal Signal levels for Ignite TV

Here are the levels:

 

Downstream

Channel Bonding ValueIndex

9
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 

Lock Status

Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked

Frequency

603 MHz
279 MHz
849 MHz
855 MHz
861 MHz
579 MHz
585 MHz
591 MHz
597 MHz
609 MHz
615 MHz
621 MHz
633 MHz
639 MHz
645 MHz
651 MHz
657 MHz
663 MHz
669 MHz
675 MHz
681 MHz
687 MHz
693 MHz
699 MHz
705 MHz
711 MHz
717 MHz
723 MHz
825 MHz
831 MHz
837 MHz
843 MHz
350 MHz
275600000

SNR

40.0 dB
40.4 dB
37.1 dB
36.9 dB
37.0 dB
40.2 dB
40.4 dB
40.3 dB
40.0 dB
39.5 dB
38.9 dB
39.0 dB
38.8 dB
39.1 dB
39.4 dB
39.8 dB
40.0 dB
40.4 dB
40.4 dB
40.3 dB
40.6 dB
40.4 dB
40.2 dB
40.0 dB
39.7 dB
39.2 dB
39.4 dB
39.5 dB
38.0 dB
38.1 dB
38.1 dB
37.7 dB
39.6 dB
NA

Power Level

0.7 dBmV
4.3 dBmV
-3.3 dBmV
-3.4 dBmV
-3.5 dBmV
1.0 dBmV
1.7 dBmV
1.9 dBmV
1.2 dBmV
0.7 dBmV
-1.9 dBmV
-2.3 dBmV
-2.2 dBmV
-1.7 dBmV
-1.0 dBmV
0.5 dBmV
0.4 dBmV
1.7 dBmV
2.0 dBmV
2.5 dBmV
2.7 dBmV
1.9 dBmV
1.2 dBmV
0.6 dBmV
0.2 dBmV
-1.0 dBmV
0.5 dBmV
0.2 dBmV
-2.0 dBmV
-1.8 dBmV
-1.8 dBmV
-2.5 dBmV
4.2 dBmV
NA

Modulation

256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
OFDM
OFDM
 
IndexLock StatusFrequencySymbol RatePower LevelModulationChannel Type
Upstream
Channel Bonding Value
1
2
3
Locked
Locked
Locked
30 MHz
23 MHz
38 MHz
5120
5120
2560
36.5 dBmV
36.5 dBmV
36.8 dBmV
QAM
QAM
QAM
ATDMA
ATDMA
TDMA_AND_ATDMA
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Resident Expert
Resident Expert
Posts: 7,012

Re: Ideal Signal levels for Ignite TV

@Alex4161 here are your signal levels, charted.  Its a little ugly to say the least.  That line should be a flat line at 0 dBmV.  You definitely have some cable resonant issues in the 600 to 700 Mhz range.  Yes, those levels are within spec, but, they don't meet the minimum to maximum signal level range or the max signal level slope.  I suspect that tech support would say "h'uh, what are U talking about?" 

 

Note that your DOCSIS 3.1 OFDM channel starts at 350 Mhz and runs upwards from there.  It ends around 500 to 542 Mhz, depending on how wide the XB6 OFDM channel is.  So, looking at your DOCSIS 3.0 signal levels, that OFDM channel is running with a downwards slope from start to finish which is less than ideal. 

 

Contact @RogersAndy or @RogersTony to have a look at this.  I have no doubt that you need a tech to check the external cabling and connectors.   Are you in a house, condo, apartment, etc, etc ??

 

mahomed Docsis 3.0 signal levels.png

 

 



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Posts: 390

Re: Ideal Signal levels for Ignite TV

Hello,

 

Thanks for the information.  I am in a house.  I just have 1 connection that plugs into the XB6.  The wire runs from the side of my house to my bedroom.  No other splits in the house.  I had a 2 way splitter before but removed it as I don't need all the additional outlets anymore.

 

My services work fine so I am not sure if calling support would make any difference.  Since I am at the end of the linex, they would probably need to get maintenance involved.

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Posts: 7,012

Re: Ideal Signal levels for Ignite TV

Ok, that makes sense considering that you're at the end of the line.  The field tech would or should check the external cable and its connectors.  If that cable has been in service for a good number of years, then its probably due for replacement.  Without getting maintenance involved, that's probably the best that would happen. 

 

The chart requires moderator approval again as I changed the chart title slightly.  Message has been sent to the moderators.



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I'm a Reliable Contributor
Posts: 390

Re: Ideal Signal levels for Ignite TV

I believe we had a portion of the underground cable from the tap replaced a couple years ago.  The connection from there to the side of the house at the time seemed fine.  I don't mind a service call as long as the tech does not make things worse.  The Sr. guys seem fine but the jr ones like to toss an amp on it or don't want to open the proper tickets.

 

Is there a Sr. Tech that can check out the wiring? 

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Posts: 390

Re: Ideal Signal levels for Ignite TV

How do I get in touch with  @RogersAndy or @RogersTony ?  I tried to PM them but this name does not appear

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Posts: 7,012

Re: Ideal Signal levels for Ignite TV

@Alex4161 you should be able to send a message to @CommunityHelps and ask either one to respond to your message.  Since you've had a senior tech out to your home previously, I suspect that either Andy or Tony might be able to arrange for a senior tech visit.  



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Posts: 390

Re: Ideal Signal levels for Ignite TV

Thanks. I have posted a link to them.