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Gerry_Atric
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Downstream power levels low - needs boosting

Hello

I've noticed that my downstream power levels for 24 channels currently range from -2.4 dBmV to -10.2 dBmV. I know the hot weather has made things slightly worse, but I am worried that these power levels will eventually cause me to lose the service which I rely on very heavily.

Is it possible for a VM technician to boost the power levels by say +6 dBmV at the cabinet? 

The cables are all secure and I haven't seen any visible signs of damage, I have checked.

I am not sure how all this works so any advice would be appreciated. I did read the helpful sticky'd guide in the forum about acceptable power levels and it does appear -10.2 dBmV has gone beyond the acceptable! 

I'm actually surprised it's still working. But the question is, for how much longer?

 

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Gerry_Atric
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Re: Downstream power levels low - needs boosting

Here are the stats to assist (the figures have slightly changed since my last post not long ago, but not by much)

Cable Modem StatusItem Status Comments

Acquired Downstream Channel (Hz)
235000000
Locked
Ranged Upstream Channel (Hz)
46200127
Locked
Provisioning State
Online
 
 

 

Downstream bonded channels

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

1235000000-2.540256 qam13
2243000000-2.740256 qam14
3251000000-340256 qam15
4259000000-3.540256 qam16
5267000000-3.540256 qam17
6275000000-4.240256 qam18
7283000000-4.238256 qam19
8291000000-4.438256 qam20
9299000000-4.538256 qam21
10307000000-4.938256 qam22
11315000000-4.938256 qam23
12323000000-5.238256 qam24
13331000000-5.738256 qam25
14339000000-5.238256 qam26
15347000000-5.738256 qam27
16355000000-6.238256 qam28
17363000000-638256 qam29
18371000000-6.538256 qam30
19379000000-6.538256 qam31
20387000000-6.738256 qam32
21491000000-9.737256 qam33
22499000000-10.236256 qam34
23507000000-10.436256 qam35
24515000000-10.436256 qam36



Downstream bonded channels

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

1Locked40.327400
2Locked40.331430
3Locked40.338590
4Locked40.345920
5Locked40.345490
6Locked40.366280
7Locked38.970860
8Locked38.9103640
9Locked38.9128840
10Locked38.9137810
11Locked38.6127200
12Locked38.9167950
13Locked38.9192660
14Locked38.9146570
15Locked38.6189000
16Locked38.6218670
17Locked38.9196580
18Locked38.6231110
19Locked38.6231990
20Locked38.9237980
21Locked37.3773910
22Locked36.61065170
23Locked36.61248830
24Locked36.61206240

 

Upstream bonded channels

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

14620012748.3512064 qam3
23940000047.8512064 qam4
33260000047.3512064 qam9
42580000046.3512064 qam10



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0000
2ATDMA0000
3ATDMA0010
4ATDMA0020

 

 

 

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Gerry_Atric
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Re: Downstream power levels low - needs boosting

Network Log

Time Priority Description

21/07/2021 15:47:11noticeLAN login Success;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
21/07/2021 11:41:44criticalNo Ranging Response received - T3 time-out;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
21/07/2021 08:46:22noticeLAN login Success;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
20/07/2021 18:53:15ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
20/07/2021 10:30:32noticeLAN login Success;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
19/07/2021 23:30:40criticalNo Ranging Response received - T3 time-out;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
19/07/2021 11:09:54noticeLAN login Success;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
18/07/2021 01:18:4ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
17/07/2021 07:29:23criticalNo Ranging Response received - T3 time-out;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
16/07/2021 08:23:40noticeLAN login Success;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
01/01/1970 00:01:42criticalNo Ranging Response received - T3 time-out;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
16/07/2021 02:20:13Warning!RCS Partial Service;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
16/07/2021 01:20:12criticalStarted Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
14/07/2021 02:52:26criticalNo Ranging Response received - T3 time-out;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
12/07/2021 23:28:23ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
10/07/2021 07:03:8criticalNo Ranging Response received - T3 time-out;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
09/07/2021 11:28:22ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
06/07/2021 00:11:33noticeLAN login Success;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
05/07/2021 15:26:8criticalNo Ranging Response received - T3 time-out;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;
05/07/2021 13:48:35noticeLAN login Success;CM-MAC=XX;CMTS-MAC=XX;CM-QOS=1.1;CM-VER=3.0;

 

Copy of the error log above, with MAC addresses replaced with 'XX' 

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lotharmat
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Message 4 of 11
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Re: Downstream power levels low - needs boosting

Downstream power looks way too low on a lot of channels!

Do you have an attenuator fitted at the back of the hub (where the white Co-Ax goes into it)?



------------------------------------------------------------------
Hub 3 - Modem Mode - TP-Link Archer C7

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Gerry_Atric
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Re: Downstream power levels low - needs boosting

Thanks for your reply!

Reassuring to know these levels aren’t right!

There are no attenuators plugged in.

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lotharmat
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Re: Downstream power levels low - needs boosting

OK - Hang tight for VM Forum staff to get to it !



------------------------------------------------------------------
Hub 3 - Modem Mode - TP-Link Archer C7

Gerry_Atric
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Re: Downstream power levels low - needs boosting

Thanks, looks like a visit is needed to sort this out. Will wait for them to help out.

Hopefully it will be a quick and straightforward job (famous last words!)

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Corey_C
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Re: Downstream power levels low - needs boosting

Hi Gerry_Atric, 

 

Sorry to hear that you have been having some broadband connection issues. I've sent you a private message to confirm your account details.

 

Cheers,

Corey C

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Gerry_Atric
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Re: Downstream power levels low - needs boosting

Thanks for everything you've done in the background, I will wait for the technician to visit and fingers crossed, all will be well again. 

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Corey_C
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Re: Downstream power levels low - needs boosting

You're welcome. 

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