Internet drop out and some log errors - anything to worry about?

[roodles]

The internet dropped out, I went into the router and these logs were at the same time:

06-01-2025 16:20:07	critical	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 16:20:07	critical	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 16:19:00	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

Any info on what this means?
Thanks

[jbrennand]

---

@roodles wrote:

The internet dropped out, I went into the router and these logs were at the same time:

Any info on what this means?
Thanks

---

See....

https://community.virginmedia.com/t5/Networking-and-WiFi/Hub-status-data-understanding-network-log-m...

Then post up the rest of the data like this.....

Navigate to these “data pages” and just copy/paste the normal “Formatted Text” (not images) 3 FULL sets of data onto here – 2 tables from the Downstream, 2 from the Upstream, & the Network Logs pages. Don't worry too much about the formatting it can be easily read & DON’T include personal data or MAC addresses - blank them out - if you copy/paste the data, the board software will do this for you (you may need to click the "submit" button again). If character limits are “exceeded” - just do two posts

_________

[Akua_A]

Hi @roodles,

Welcome back to our community forums and sorry to hear you are having some dropouts on your service. We can understand the inconvenience caused and we want to do our best to help. We have run some tests and we can see some issues with your hub power levels. For this reason, we are sending you a private message. Please keep an eye out for an envelope at the top right corner of your Forum page. Let me know if you have any issues locating this.

Thanks,

[roodles]

Ok thanks, I will take a look for that

Cheers

[Akua_A]

Please get back to us when you can 🙂

[roodles]

Many thanks. Here is the info:

3.0 Downstream channels

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

1	331000000	8.7	41	QAM 256	25
2	139000000	10.7	39	QAM 256	1
3	147000000	10.4	39	QAM 256	2
4	155000000	10.3	39	QAM 256	3
5	163000000	10.1	38	QAM 256	4
6	171000000	9.8	39	QAM 256	5
7	179000000	9.4	39	QAM 256	6
8	187000000	9.4	39	QAM 256	7
9	195000000	9.5	40	QAM 256	8
10	203000000	9	40	QAM 256	9
11	211000000	8.9	40	QAM 256	10
12	219000000	8.9	40	QAM 256	11
13	227000000	8.6	40	QAM 256	12
14	235000000	8.4	40	QAM 256	13
15	243000000	7.9	40	QAM 256	14
16	251000000	6.8	40	QAM 256	15
17	259000000	6.2	40	QAM 256	16
18	267000000	6.9	40	QAM 256	17
19	275000000	7.3	40	QAM 256	18
20	283000000	7.6	40	QAM 256	19
21	291000000	7.9	40	QAM 256	20
22	299000000	8.4	40	QAM 256	21
23	307000000	8.9	41	QAM 256	22
24	315000000	9	41	QAM 256	23
25	339000000	9.1	41	QAM 256	26
26	347000000	9.1	41	QAM 256	27
27	355000000	9	41	QAM 256	28
28	363000000	9.1	41	QAM 256	29
29	371000000	9	41	QAM 256	30
30	379000000	8.3	41	QAM 256	31
31	387000000	7.6	41	QAM 256	32

3.0 Downstream channels

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

1	Locked	41	30	0
2	Locked	39	31	0
3	Locked	39	38	0
4	Locked	39	37	0
5	Locked	38	40	0
6	Locked	39	39	0
7	Locked	39	28	0
8	Locked	39	40	0
9	Locked	40	34	0
10	Locked	40	28	0
11	Locked	40	18	0
12	Locked	40	36	0
13	Locked	40	29	0
14	Locked	40	24	0
15	Locked	40	24	0
16	Locked	40	40	0
17	Locked	40	29	0
18	Locked	40	34	0
19	Locked	40	29	0
20	Locked	40	30	0
21	Locked	40	35	0
22	Locked	40	24	0
23	Locked	41	30	0
24	Locked	41	28	0
25	Locked	41	23	0
26	Locked	41	19	0
27	Locked	41	22	0
28	Locked	41	21	0
29	Locked	41	24	0
30	Locked	41	30	0
31	Locked	41	32	0

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

33

94

4K

1840

QAM 4096

1108

3.1 Downstream channels

Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile)

33

Locked

40

1.1

3991027699

9

[roodles]

3.0 Upstream channels

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

0	49600000	38.8	5120	QAM 64	1
1	43100000	38.5	5120	QAM 64	2
2	36600000	38.3	5120	QAM 64	3
3	30100000	37.8	5120	QAM 64	4
4	23600000	37.5	5120	QAM 64	5

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

0	ATDMA	0	0	0	0
1	ATDMA	0	0	0	0
2	ATDMA	0	0	2	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0

3.1 Upstream channels

Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation

6

10.4

34.5

2K

QAM 256

3.1 Upstream channels

Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts

6

OFDMA

208

74000000

0

0

[roodles]

08-01-2025 19:46:05	error	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
07-01-2025 13:10:09	notice	US profile assignment change. US Chan ID: 6; Previous Profile: 13; New Profile: 12 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
07-01-2025 12:06:21	notice	US profile assignment change. US Chan ID: 6; Previous Profile: 12 13; New Profile: 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 17:53:46	notice	GUI Login Status - Login Success from LAN interface
06-01-2025 17:02:52	notice	US profile assignment change. US Chan ID: 6; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 17:02:47	notice	REGISTRATION COMPLETE - Waiting for Operational status
06-01-2025 17:02:42	warning	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 17:02:35	notice	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 17:02:31	notice	TLV-11 - unrecognized OID;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 17:02:29	warning	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 17:02:27	notice	Honoring MDD; IP provisioning mode = IPv4
06-01-2025 17:02:21	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 17:02:15	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 17:02:15	critical	Cable Modem Reboot because of - Reboot UI
06-01-2025 16:20:07	critical	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 16:20:07	critical	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-01-2025 16:19:00	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-01-2025 20:05:25	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-01-2025 20:05:21	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-01-2025 20:05:20	critical	Cable Modem Reboot because of - Erouter Mode Change
05-01-2025 12:03:19	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-01-2025 12:03:13	critical	Cable Modem Reboot because of - pin-reset
05-01-2025 12:03:13	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

[roodles]

Just bumping this to see if any of the resident experts have a view on the power levels.

From what I read in the sticky post they're in spec?

[Kath_P]

Hi roodles, 

Thanks for coming back to us in the Community. I can see Akua sent you a private message to assist further. It doesn't look as though we've had a response from you. Please reply back to the PM so we can assist you further. 

Many thanks,