Contributor

Re: Is downstream power too high?


@MsRaye wrote:

Tech was wrong telling you that, the filter is for internet only, It blocks qam cable from 54- 500 mHz and does little to nothing outside that range. Guess you're internet only.

 Reducing the ouit of docsis band levels might improve the modems decode/ demodulation... But I didn't see bad s/n

 

 

 But at least he contacted the bucket truck guys, they need to go back to the street and drop in the proper value directional coupler insert or reset the levels at the street.  

 Or at least put a 6dB pad on your line at the modem, that would take upstream to +43 dBmv and downstream to +6 dBmv which should be fine.

 

 BTW, i see no doifference in your s/n from your early post to now

I don't think your problem is solved, see how it acts for a day, then if still bad, call twc back out on it

 

 


Okay, back home now.  Yeah, I see little to no difference in SNR also.

 

I do see a difference in the (how do I say this) dBmV range.  Meaning, it used to be a difference of about 1 dBmV between the lowest and highest level, now I see a difference of about 2 dBmV between the lowest and highest.

Expert

Re: Is downstream power too high?

591 is going to be a little lower as it's nearest the filter/ trap which has a logarithmic roll off at it's edges

It's probably a 54-550 mHz filter and at 550 is probable got 30 + dB of loss

 

 

Contributor

Re: Is downstream power too high?


@agentx5 wrote:

 

@Kudos @ the field tech you spoke with, he sounded professional.

 

@Hnnngh @ the maintenance tech (bucket truck).  If you're installing a filter, kind of need to re-test after the filter is installed.

 

 


Okay, here is where I think the confusion is.  The tech installed the filter at the tap next to the house.  I don't know what the bucket truck guys did as it was down by the road and couldn't see through the trees, just heard the reverse chime on their truck and could see the bottom of the truck and part of the bucket arm.
Though, I was expecting them to check the signal at the tap as well, and it doesn't seem like they did.  Smiley Frustrated

 

 

 

Expert

Re: Is downstream power too high?

I know where the filter was installed, Also the last 2 pictures do show a hardline terminator screwed in.

 The bucket truck gus should have looked at the level on your pole and worked backwards to find and change the wrong directional coupler. Sounds like they only looked at an amplifier.

 

 

Contributor

Re: Is downstream power too high?

lol

 

good news about the terminator, thank you

 

we'll see how it goes, there was, at least, an improvement.  If maintenance doesn't carry a ladder (which I don't see why they wouldn't) then they probably couldn't get the truck to the tap as the ground was saturated.  They would have torn up the lawn.

 

 

Expert

Re: Is downstream power too high?

I feel the pain, weigh 140# and can't handle a 75#  24' or 28' fiberglass ladder...

 

Contributor

Re: Is downstream power too high?

Well, I called back in, asked to get a message to dispatch.   I don't think they had any clue what I was talking about, but they set up an appointment for another tech to come out on Sunday. 

Contributor

Re: Is downstream power too high?

This is interesting.  It's gotten even lower.

 

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectedUncorrectables
1LockedQAM2561591000000 Hz10.0 dBmV42.5 dB160
2LockedQAM2562597000000 Hz10.5 dBmV42.5 dB170
3LockedQAM2563603000000 Hz10.6 dBmV42.5 dB290
4LockedQAM2564609000000 Hz10.4 dBmV42.2 dB490
5LockedQAM2565615000000 Hz10.5 dBmV42.0 dB640
6LockedQAM2566621000000 Hz10.8 dBmV42.0 dB700
7LockedQAM2567627000000 Hz10.8 dBmV41.8 dB810
8LockedQAM2568633000000 Hz10.9 dBmV41.8 dB900
9LockedQAM2569639000000 Hz10.9 dBmV41.7 dB1010
10LockedQAM25610645000000 Hz11.1 dBmV42.0 dB750
11LockedQAM25611651000000 Hz11.0 dBmV41.8 dB680
12LockedQAM25612657000000 Hz11.0 dBmV41.2 dB400
13LockedQAM25613663000000 Hz10.7 dBmV41.5 dB550
14LockedQAM25614669000000 Hz11.0 dBmV41.8 dB260
15LockedQAM25615675000000 Hz11.7 dBmV42.2 dB140
16LockedQAM25616681000000 Hz11.8 dBmV42.2 dB80

 

 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA115120 Ksym/sec30600000 Hz38.3 dBmV
2LockedTDMA92560 Ksym/sec19400000 Hz36.3 dBmV
3LockedATDMA105120 Ksym/sec24200000 Hz37.0 dBmV
4LockedATDMA122560 Ksym/sec37000000 Hz38.8 dBmV



Upstream is ~ 1 higher as well.  Could it be the higher temp and sun today?  Or have they come back out maybe?

Expert

Re: Is downstream power too high?

I have no clue, you could add a 4 way splitter with loads on 3 ports or a 6dB pad on the line now...

 It would raise the upstream to +45 and lower the ds to +5

 

Contributor

Re: Is downstream power too high?


@MsRaye wrote:

I have no clue, you could add a 4 way splitter with loads on 3 ports or a 6dB pad on the line now...

 It would raise the upstream to +45 and lower the ds to +5

 


I think this is what I'm going to try.  Either a 6db attenuator pad or cable simulator (if not the same thing).  I think i read a simulator wouldn't affect the upload levels.  

 

Apparently, with me being internet only and no splitters or anything, my signal will be hotter, according to the second tech.  He showed how my neighbor's RX (Downstream power) was 0 dBmV, guess they had multiple services or something.

 

Here are the current levels after a second visit.  He was here Sunday, so bucket truck should have already been here after 48+ hours.

 

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectedUncorrectables
1LockedQAM2561591000000 Hz10.6 dBmV42.7 dB90
2LockedQAM2562597000000 Hz11.0 dBmV42.5 dB60
3LockedQAM2563603000000 Hz11.1 dBmV42.6 dB150
4LockedQAM2564609000000 Hz10.8 dBmV42.4 dB240
5LockedQAM2565615000000 Hz11.0 dBmV42.2 dB260
6LockedQAM2566621000000 Hz11.4 dBmV42.3 dB300
7LockedQAM2567627000000 Hz11.4 dBmV42.0 dB490
8LockedQAM2568633000000 Hz11.5 dBmV41.9 dB280
9LockedQAM2569639000000 Hz11.6 dBmV41.9 dB290
10LockedQAM25610645000000 Hz11.7 dBmV42.2 dB230
11LockedQAM25611651000000 Hz11.7 dBmV42.0 dB300
12LockedQAM25612657000000 Hz11.7 dBmV41.4 dB190
13LockedQAM25613663000000 Hz11.4 dBmV41.8 dB250
14LockedQAM25614669000000 Hz11.8 dBmV42.0 dB100
15LockedQAM25615675000000 Hz12.4 dBmV42.3 dB90
16LockedQAM25616681000000 Hz12.5 dBmV42.3 dB70

 

 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA115120 Ksym/sec30600000 Hz37.5 dBmV
2LockedTDMA92560 Ksym/sec19400000 Hz35.8 dBmV
3LockedATDMA105120 Ksym/sec24200000 Hz36.5 dBmV
4LockedATDMA122560 Ksym/sec37000000 Hz38.3 dBmV