Following a couple of recent total loss of service events, I am now seeing some packet loss at times, which is affecting upstream bandwidth. It correlates to Upstream channels operating at 16QAM rather than 64QAM.
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. This board is not a fault reporting system.
I am still seeing packet loss in the BQM, and reduced upstream bandwidth. What would cause fallback to 16QAM on certain upstream channels; could this be noise in the RF system? It's hard to know whether this is cause or effect, i.e. noise causing channel fallback to compensate?
Thanks for getting back to us here and expanding. I've checked over things on our systems and I'm unable to detect any known faults currently that would explain this.
From the BQM linked above, I am still seeing issues of reduced upstream bandwidth and occasional packet loss. I now have a high number of post-RS errors in the Downstream channels, but suspect this may well be due to transient spikes as they are not incrementing significantly. Are you able to see any issues?
Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1
139000000
0.7
37
256 qam
1
2
211000000
0.2
37
256 qam
10
3
219000000
0
36
256 qam
11
4
227000000
0
37
256 qam
12
5
235000000
-0.2
37
256 qam
13
6
243000000
-0.5
37
256 qam
14
7
251000000
-0.4
38
256 qam
15
8
259000000
-0.2
37
256 qam
16
9
267000000
0
37
256 qam
17
10
275000000
0
37
256 qam
18
11
283000000
0.4
38
256 qam
19
12
291000000
0.5
38
256 qam
20
13
299000000
1
37
256 qam
21
14
307000000
1.2
38
256 qam
22
15
315000000
1.4
38
256 qam
23
16
323000000
1.5
38
256 qam
24
17
331000000
1.7
38
256 qam
25
18
339000000
1.5
38
256 qam
26
19
347000000
1.5
38
256 qam
27
20
355000000
1.4
38
256 qam
28
21
363000000
1
38
256 qam
29
22
371000000
0.7
38
256 qam
30
23
379000000
0.5
38
256 qam
31
24
387000000
0.2
38
256 qam
32
Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1
Locked
37.6
1049
7686
2
Locked
37.3
987
7606
3
Locked
36.6
906
8722
4
Locked
37.3
806
8630
5
Locked
37.6
917
7421
6
Locked
37.6
1610
7083
7
Locked
38.6
932
7414
8
Locked
37.6
1403
7203
9
Locked
37.6
845
7400
10
Locked
37.6
947
7385
11
Locked
38.6
1167
594
12
Locked
38.6
832
7100
13
Locked
37.6
891
7150
14
Locked
38.9
864
2166
15
Locked
38.9
894
4682
16
Locked
38.6
896
6334
17
Locked
38.6
866
5385
18
Locked
38.6
874
6247
19
Locked
38.9
1033
5086
20
Locked
38.6
991
13314
21
Locked
38.6
1028
13294
22
Locked
38.6
1002
13233
23
Locked
38.6
987
13585
24
Locked
38.6
1083
13716
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1
49600000
46
5120
64 qam
1
2
23600781
44.8
5120
16 qam
5
3
30100087
45
5120
16 qam
4
4
36600000
45.3
5120
64 qam
3
5
43100000
45.8
5120
64 qam
2
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:17:34
critical
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:15:24
Warning!
Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:15:19
critical
SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
They don’t regard 16QAM as a fault because, as the OP has deduced, is the pre-provisioned fallback to cover for RF noise. But the downstream also appears to be suffering. Are your coax cables tightly screwed in both ends, inside and outside? Neighbours having similar issues?
Thanks for the tips. Cables are all connected securely (and the system has been rock-solid for months). I am not sure I would have noticed this is I hadn't spotted my upstream wasn't what it should be, which then led into looking at the router stats and the BQM. I suspect the limited packet loss has been masked by upper-level protocols (though we can never be sure where the packet loss actually is; e.g. it could be anywhere on the path from the VM core network towards the monitoring host).
Things do appear to be more stable at the moment, and all Upstream channels are back to 64QAM, and there has been no packet loss in the BQM for the last 24 hours.
Thanks for the update mmelbourne, we're pleased to hear this has settled down and improved over recent days. If you monitor it going forward and experience further issues, let us know and we can take a look.
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Upstream","id":"message:5551163","revisionNum":2,"repliesCount":9,"author":{"__ref":"User:user:256914"},"depth":0,"hasGivenKudo":false,"board":{"__ref":"Forum:board:Wireless"},"conversation":{"__ref":"Conversation:conversation:5551163"},"readOnly":false,"editFrozen":false,"moderationData":{"__ref":"ModerationData:moderation_data:5551163"},"body":"
Hi,
Following a couple of recent total loss of service events, I am now seeing some packet loss at times, which is affecting upstream bandwidth. It correlates to Upstream channels operating at 16QAM rather than 64QAM.
For reference, the faults in question were: F011415205 & F011411948.
All power levels (etc) look fine, but I include them for completeness:
Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1
139000000
1
37
256 qam
1
2
147000000
1.2
37
256 qam
2
3
219000000
0.5
37
256 qam
11
4
227000000
0.2
37
256 qam
12
5
235000000
0
37
256 qam
13
6
243000000
-0.2
37
256 qam
14
7
251000000
0
38
256 qam
15
8
259000000
0
38
256 qam
16
9
267000000
0.2
38
256 qam
17
10
275000000
0
37
256 qam
18
11
283000000
0.5
38
256 qam
19
12
291000000
0.7
38
256 qam
20
13
299000000
1.2
37
256 qam
21
14
307000000
1.5
38
256 qam
22
15
315000000
1.5
38
256 qam
23
16
323000000
1.7
38
256 qam
24
17
331000000
2
38
256 qam
25
18
339000000
1.7
38
256 qam
26
19
347000000
1.7
38
256 qam
27
20
355000000
1.5
38
256 qam
28
21
363000000
1.4
38
256 qam
29
22
371000000
1
38
256 qam
30
23
379000000
1
38
256 qam
31
24
387000000
0.7
38
256 qam
32
Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1
Locked
37.6
1358
5161
2
Locked
37.3
886
5350
3
Locked
37.3
66
0
4
Locked
37.3
71
0
5
Locked
37.6
82
0
6
Locked
37.6
87
0
7
Locked
38.6
137
0
8
Locked
38.6
110
0
9
Locked
38.6
229
1
10
Locked
37.6
299
20
11
Locked
38.6
150
0
12
Locked
38.6
84
10
13
Locked
37.3
49
0
14
Locked
38.6
75
0
15
Locked
38.9
79
0
16
Locked
38.6
43
0
17
Locked
38.9
58
0
18
Locked
38.9
64
0
19
Locked
38.6
107
0
20
Locked
38.6
50
0
21
Locked
38.6
43
0
22
Locked
38.9
33
0
23
Locked
38.6
34
0
24
Locked
38.9
250
89
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1
49600000
46
5120
64 qam
1
2
23599593
45
5120
16 qam
5
3
30100073
45.2
5120
16 qam
4
4
36600015
45.5
5120
64 qam
3
5
43100000
45.8
5120
64 qam
2
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1
ATDMA
0
0
0
0
2
ATDMA
0
0
0
0
3
ATDMA
0
0
2
0
4
ATDMA
0
0
1
0
5
ATDMA
0
0
10
0
","body@stringLength":"9693","rawBody":"
Hi,
Following a couple of recent total loss of service events, I am now seeing some packet loss at times, which is affecting upstream bandwidth. It correlates to Upstream channels operating at 16QAM rather than 64QAM.
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. This board is not a fault reporting system.
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. This board is not a fault reporting system.
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Operating at 16QAM rather than 64QAM results in stable connection but with reduced bandwidth.
Packet loss is a different matter & much harder to pin down as none of the online tools report where the packets are lost / delayed.
Hey mmelbourne, thank you for reaching out and I am sorry to hear this.
\n
I've taken a look and I can see there was an area outage however this has now ended.
\n
How has the connection been since?
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I am still seeing packet loss in the BQM, and reduced upstream bandwidth. What would cause fallback to 16QAM on certain upstream channels; could this be noise in the RF system? It's hard to know whether this is cause or effect, i.e. noise causing channel fallback to compensate?
I am still seeing packet loss in the BQM, and reduced upstream bandwidth. What would cause fallback to 16QAM on certain upstream channels; could this be noise in the RF system? It's hard to know whether this is cause or effect, i.e. noise causing channel fallback to compensate?
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\n Thanks for getting back to us here and expanding. I've checked over things on our systems and I'm unable to detect any known faults currently that would explain this.
\n How are things for you today? Any better at all?
\n Thanks for getting back to us here and expanding. I've checked over things on our systems and I'm unable to detect any known faults currently that would explain this.
\n How are things for you today? Any better at all?
\n Thanks,
\n
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From the BQM linked above, I am still seeing issues of reduced upstream bandwidth and occasional packet loss. I now have a high number of post-RS errors in the Downstream channels, but suspect this may well be due to transient spikes as they are not incrementing significantly. Are you able to see any issues?
Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1
139000000
0.7
37
256 qam
1
2
211000000
0.2
37
256 qam
10
3
219000000
0
36
256 qam
11
4
227000000
0
37
256 qam
12
5
235000000
-0.2
37
256 qam
13
6
243000000
-0.5
37
256 qam
14
7
251000000
-0.4
38
256 qam
15
8
259000000
-0.2
37
256 qam
16
9
267000000
0
37
256 qam
17
10
275000000
0
37
256 qam
18
11
283000000
0.4
38
256 qam
19
12
291000000
0.5
38
256 qam
20
13
299000000
1
37
256 qam
21
14
307000000
1.2
38
256 qam
22
15
315000000
1.4
38
256 qam
23
16
323000000
1.5
38
256 qam
24
17
331000000
1.7
38
256 qam
25
18
339000000
1.5
38
256 qam
26
19
347000000
1.5
38
256 qam
27
20
355000000
1.4
38
256 qam
28
21
363000000
1
38
256 qam
29
22
371000000
0.7
38
256 qam
30
23
379000000
0.5
38
256 qam
31
24
387000000
0.2
38
256 qam
32
Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1
Locked
37.6
1049
7686
2
Locked
37.3
987
7606
3
Locked
36.6
906
8722
4
Locked
37.3
806
8630
5
Locked
37.6
917
7421
6
Locked
37.6
1610
7083
7
Locked
38.6
932
7414
8
Locked
37.6
1403
7203
9
Locked
37.6
845
7400
10
Locked
37.6
947
7385
11
Locked
38.6
1167
594
12
Locked
38.6
832
7100
13
Locked
37.6
891
7150
14
Locked
38.9
864
2166
15
Locked
38.9
894
4682
16
Locked
38.6
896
6334
17
Locked
38.6
866
5385
18
Locked
38.6
874
6247
19
Locked
38.9
1033
5086
20
Locked
38.6
991
13314
21
Locked
38.6
1028
13294
22
Locked
38.6
1002
13233
23
Locked
38.6
987
13585
24
Locked
38.6
1083
13716
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1
49600000
46
5120
64 qam
1
2
23600781
44.8
5120
16 qam
5
3
30100087
45
5120
16 qam
4
4
36600000
45.3
5120
64 qam
3
5
43100000
45.8
5120
64 qam
2
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:17:34
critical
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:15:24
Warning!
Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:15:19
critical
SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
From the BQM linked above, I am still seeing issues of reduced upstream bandwidth and occasional packet loss. I now have a high number of post-RS errors in the Downstream channels, but suspect this may well be due to transient spikes as they are not incrementing significantly. Are you able to see any issues?
Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1
139000000
0.7
37
256 qam
1
2
211000000
0.2
37
256 qam
10
3
219000000
0
36
256 qam
11
4
227000000
0
37
256 qam
12
5
235000000
-0.2
37
256 qam
13
6
243000000
-0.5
37
256 qam
14
7
251000000
-0.4
38
256 qam
15
8
259000000
-0.2
37
256 qam
16
9
267000000
0
37
256 qam
17
10
275000000
0
37
256 qam
18
11
283000000
0.4
38
256 qam
19
12
291000000
0.5
38
256 qam
20
13
299000000
1
37
256 qam
21
14
307000000
1.2
38
256 qam
22
15
315000000
1.4
38
256 qam
23
16
323000000
1.5
38
256 qam
24
17
331000000
1.7
38
256 qam
25
18
339000000
1.5
38
256 qam
26
19
347000000
1.5
38
256 qam
27
20
355000000
1.4
38
256 qam
28
21
363000000
1
38
256 qam
29
22
371000000
0.7
38
256 qam
30
23
379000000
0.5
38
256 qam
31
24
387000000
0.2
38
256 qam
32
Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1
Locked
37.6
1049
7686
2
Locked
37.3
987
7606
3
Locked
36.6
906
8722
4
Locked
37.3
806
8630
5
Locked
37.6
917
7421
6
Locked
37.6
1610
7083
7
Locked
38.6
932
7414
8
Locked
37.6
1403
7203
9
Locked
37.6
845
7400
10
Locked
37.6
947
7385
11
Locked
38.6
1167
594
12
Locked
38.6
832
7100
13
Locked
37.6
891
7150
14
Locked
38.9
864
2166
15
Locked
38.9
894
4682
16
Locked
38.6
896
6334
17
Locked
38.6
866
5385
18
Locked
38.6
874
6247
19
Locked
38.9
1033
5086
20
Locked
38.6
991
13314
21
Locked
38.6
1028
13294
22
Locked
38.6
1002
13233
23
Locked
38.6
987
13585
24
Locked
38.6
1083
13716
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1
49600000
46
5120
64 qam
1
2
23600781
44.8
5120
16 qam
5
3
30100087
45
5120
16 qam
4
4
36600000
45.3
5120
64 qam
3
5
43100000
45.8
5120
64 qam
2
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:17:34
critical
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:15:24
Warning!
Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/07/2024 11:15:19
critical
SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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They don’t regard 16QAM as a fault because, as the OP has deduced, is the pre-provisioned fallback to cover for RF noise. But the downstream also appears to be suffering. Are your coax cables tightly screwed in both ends, inside and outside? Neighbours having similar issues?
They don’t regard 16QAM as a fault because, as the OP has deduced, is the pre-provisioned fallback to cover for RF noise. But the downstream also appears to be suffering. Are your coax cables tightly screwed in both ends, inside and outside? Neighbours having similar issues?
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Thanks for the tips. Cables are all connected securely (and the system has been rock-solid for months). I am not sure I would have noticed this is I hadn't spotted my upstream wasn't what it should be, which then led into looking at the router stats and the BQM. I suspect the limited packet loss has been masked by upper-level protocols (though we can never be sure where the packet loss actually is; e.g. it could be anywhere on the path from the VM core network towards the monitoring host).
Things do appear to be more stable at the moment, and all Upstream channels are back to 64QAM, and there has been no packet loss in the BQM for the last 24 hours.
Thanks for the tips. Cables are all connected securely (and the system has been rock-solid for months). I am not sure I would have noticed this is I hadn't spotted my upstream wasn't what it should be, which then led into looking at the router stats and the BQM. I suspect the limited packet loss has been masked by upper-level protocols (though we can never be sure where the packet loss actually is; e.g. it could be anywhere on the path from the VM core network towards the monitoring host).
Things do appear to be more stable at the moment, and all Upstream channels are back to 64QAM, and there has been no packet loss in the BQM for the last 24 hours.
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Thanks for the update mmelbourne, we're pleased to hear this has settled down and improved over recent days. If you monitor it going forward and experience further issues, let us know and we can take a look.
Thanks for the update mmelbourne, we're pleased to hear this has settled down and improved over recent days. If you monitor it going forward and experience further issues, let us know and we can take a look.
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