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mmelbourne's avatar
mmelbourne
Dialled in
2 years ago

Upstream channels dropping to 16QAM

Hi,

I am seeing one or sometimes two of my five upstream channels dropping to 16QAM from 64QAM; is this acceptable or indicative of a fault somewhere (e.g. noise in the system)? I am not seeing obvious issues (no packet loss on BQM etc), but upstream bandwidth testing is variable (on M250 package).

Downstream channels appear fine: power levels and SNR good, and no post-RS errors.

Cheers, Matt

 

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
14960000045.5512064 qam1
23659996145512064 qam3
32360007844.5512016 qam5
44310000045.3512064 qam2
53010000044.7512016 qam4


Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1ATDMA0020
2ATDMA0030
3ATDMA0050
4ATDMA0010
5ATDMA0030
 

The logs are only showing a few T3 timeouts:

06/04/2024 01:59:31ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/04/2024 04:11:20criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
30/03/2024 01:59:31ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
30/03/2024 00:32:30criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

1 Reply

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  • Tudor's avatar
    Tudor
    Very Insightful Person
    2 years ago

    Check with Area faults on 0800 561 0061 If you have a VM landline 150 this goes down to post code level. You could also try the web page status, but this is not recommended as it only covers issues that affect a very large number of customers.

    VM will not dispatch any technicians while an area fault exists.

    If no area faults found:

    The primary place to report faults or for service requests is Customer Services on 0345 454 1111/150 if you have a VM landline or wait two or three days for a VM staff member to get to your post.