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Downstream power level adjusting with 6db forward path attenuator

Hello

I have BQM installed and seem to have lot of red block of data loss.

I have posted the up and down power level.  The down power reaches about 7.5 at night and drops to 6 when the sunny. I am only guessing the warm weather reduces the power level couple DB.

I read the ideal power level should be around zero. So if was to fit a 6bd forward path attenuator and get the power levels between +1.5 to -1.5, would that be a better connection than +7.5 to +4.5.

 

The upstream power seems to be close to the upper limit.

Appreciate any feedback 🙂

 

 

 

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

12027500006.140256 qam9
2210750000640256 qam10
3218750000640256 qam11
42267500005.840256 qam12
5234750000640256 qam13
6242750000640256 qam14
72507500005.840256 qam15
8258750000640256 qam16
9266750000640256 qam17
102747500005.640256 qam18
112827500005.640256 qam19
12290750000640256 qam20
13298750000640256 qam21
143067500005.440256 qam22
153147500005.540256 qam23
163227500005.640256 qam24
17402750000540256 qam25
184107500005.140256 qam26
19418750000540256 qam27
204267500004.540256 qam28
214347500004.940256 qam29
22442750000540256 qam30
234507500004.540256 qam31
244587500004.540256 qam32

 

 

 

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1258000784.8512064 qam4
2462000594.975512064 qam1
3394000055512064 qam2
4325999785.1512064 qam3
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Re: Downstream power level adjusting with 6db forward path attenuator

Your Downstream are well within limits.

Your Upstream are on the high side but within VM spec.

Remember that Downstream and Upstream is a balancing act.

Are you in Modem mode ?

Are you having problems ?

Post a link to your live BQM.

Instructions for posting BQM Link

Under your BQM graph are two links in red.

Click the lower link (Share Live Graph) then click generate.

Copy the text in the Direct Link box, beware, there may be more text than you can see.

On here click the Link icon (2 links chain)

 In the URL box paste the link you copied and then click OK

***********************************************************************************************************************************

Mike Robinson
Aircraft Engineer & Computer Based Training and Learning Designer for many of the world's Military Arms.


My Broadband Ping - 26_Aug_2020
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Re: Downstream power level adjusting with 6db forward path attenuator

You should absolutely not fit an attenuator as your upstream power levels will get too high.

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Hub 3.0, TP-Link Archer C8, TP-Link TL-SG1008D 8-port gigabit switch, V6
My Broadband Ping - Roger's VM Broadband Connection
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Re: Downstream power level adjusting with 6db forward path attenuator

Thanks for your help guys.

Below is the BQM 🙂

https://www.thinkbroadband.com/broadband/monitoring/quality/share/3219ae55e9a70b4c0c1a7397fec80b39b8fcfc73

As you can see below there are so may Post RS errors. These build up within days after a reboot.

The SH3 is running the Wifi..no 3rd party router. At times the wifi drops 😞

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1Locked40.9199156935
2Locked40.3186377357
3Locked40.3180347424
4Locked40.3214707586
5Locked40.9197937139
6Locked40.9163697584
7Locked40.9149636975
8Locked40.9149997147
9Locked40.9125307237
10Locked40.3140257559
11Locked40.3137307733
12Locked40.9123006994
13Locked40.9121086646
14Locked40.9106477374
15Locked40.9105857233
16Locked40.9114976314
17Locked40.987425699
18Locked40.989275383
19Locked40.383105311
20Locked40.993105479
21Locked40.985234757
22Locked40.981834864
23Locked40.378104906
24Locked40.977795175

 

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Re: Downstream power level adjusting with 6db forward path attenuator

You need a tech to come round as your upstream power levels are too high and there are too many Post RS errors.

--
Hub 3.0, TP-Link Archer C8, TP-Link TL-SG1008D 8-port gigabit switch, V6
My Broadband Ping - Roger's VM Broadband Connection
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Re: Downstream power level adjusting with 6db forward path attenuator

Just a update..already had a 6bd on order via ebay £3.95 so plugged it in. and here are the results.

Shall i keep it on or remove it...any Pro or Con?

 

 

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1202750000140256 qam9
2210750000140256 qam10
32187500000.940256 qam11
4226750000140256 qam12
5234750000140256 qam13
62427500001.240256 qam14
72507500001.240256 qam15
82587500001.240256 qam16
92667500001.240256 qam17
10274750000140256 qam18
11282750000140256 qam19
12290750000140256 qam20
132987500001.240256 qam21
143067500000.740256 qam22
153147500000.740256 qam23
163227500000.740256 qam24
174027500000.240256 qam25
184107500000.240256 qam26
194187500000.240256 qam27
20426750000040256 qam28
21434750000040256 qam29
22442750000040256 qam30
23450750000-0.240256 qam31
24458750000-0.240256 qam32

 

 

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1258000004.85512064 qam4
2462000004.925512064 qam1
3394000004.875512064 qam2
4326000005.05512064 qam3
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Re: Downstream power level adjusting with 6db forward path attenuator

How are the PostRS errors ? If they are still rising there is a problem with noise on the line.  The attenuator will not fix that. Check all the wiring from the Hub to outside and make sure there are no loose ends, and any connections are tight. 

As for the WiFi, that's up to you, as there are so many things that affect WiFi it can be hard to pin down.  A lot of user here buy their own routers and only use the Hub as a modem, myself included.

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Re: Downstream power level adjusting with 6db forward path attenuator

Appreciate your time looking at this.

The post error normally sits at zero.. then some point in the day there about 10 network logs and in that moment it logs about 10k post errors each channel.  It maybe nothing for a day then same again.

All connections tight and cable from the ouside wall box to modem is only about 3m long.

I know the Hub3 is not the most powerful but i only use it for Nexflix and 2 teenagers online gaming devices are wired. But the range on this is terrible.. struggling to reach the wireless printer 1 floor up.

If i was to ask for an engineer is there anything they can do to lower the upstream power?

 

 

26/03/2020 10:56:9Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:56:9criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:56:0Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:56:0criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:55:35Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:55:35criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:55:1Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:55:1criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:55:1Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:53:42criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:49:9Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:49:9criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:47:52Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:47:52criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:46:39Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:46:39criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:46:15Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:46:15criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/03/2020 10:46:15Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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Re: Downstream power level adjusting with 6db forward path attenuator


@sayekm wrote:

 

If i was to ask for an engineer is there anything they can do to lower the upstream power? <snip>

 

 The engineer would move your connection to another "tap" in the Cabinet, as mentioned in a previous post. This is usually how they get the power levels adjusted.  However there are cases with full Cabinets that the engineer will use attenuators on the customers premises. 

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Re: Downstream power level adjusting with 6db forward path attenuator

Downstream levels should sit between -6 to + 10 looking at your upstream 4 of them should be between 33 to 51 db so around 40 is good. . Service tech will do the usual check all connection tighten up. . If u have only broadband u should have no splitters either straight cable from wall isolater to modem. . 


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