I've had an issue with my SuperHub 5 for a few weeks now. If I restart the SH5, it will go through the startup process as normal (flashing white light, turning to steady after 2-3 minutes), but it now flashes a red light for about a minute after starting up.Recognising the red light wasn't good, I contacted Virgin Media broadband support, who sent an engineer out who replaced the wiring and splitters inside my house But after all that work, the engineer still got a flashing red light, so they decided to replace my old SH5 and it's power supply with a new one from their van. After registering the new SH5, it too showed a flashing light. I should add that while the engineer was testing, only the power cable and coax cable was connected to the SH5. My phone line and ethernet devices were disconnected throughout testing and when the flashing red light reared it's ugly head.The engineer left my premises saying they've done all they can and that my signal levels look good. But to be honest, I wasn't best pleased about lack of explanation. As far as they were concerned, my internet was working and the flashing red light was just a niggle I'd have to live with.Tonight (two weeks later), the red light started flashing without any apparent cause. The network logs didn't show any messages at same time this happened.I will do my best to post my the SH5 stats as it currently stands. Perhaps somebody might spot something that I could sign post the next engineer to.

There are a lot of power cycles in that log? Are you doing this? If not, setup a BQM to see what your incoming circuit is doing. http://www.thinkbroadband.com/ping

I can't help with this but has there been any recent Hub5 firmware updates? I ask as my router now goes through the 30-60 second flashing red LED on reboot and it never used to do that and there is more than one thread mentioning this boot sequence. I have no internet issues and BQM is fine. Until the last few weeks I'd never seen a flashing red light on my Hub.

3.0 Downstream channelsChannelFrequency (Hz)Power (dBmV)SNR (dB)ModulationChannel ID12430000006.642QAM 2561421390000006.842QAM 256131470000006.842QAM 25624155000000742QAM 256351630000006.842QAM 256461710000006.842QAM 256571790000006.642QAM 256681870000006.742QAM 256791950000006.742QAM 2568102030000006.742QAM 2569112110000006.842QAM 25610122190000006.942QAM 25611132270000006.842QAM 25612142350000006.842QAM 25613152510000006.642QAM 25615162590000006.342QAM 25616172670000006.542QAM 25617182750000006.242QAM 25618192830000006.542QAM 25619202910000006.642QAM 25620212990000006.842QAM 25621223070000006.642QAM 25622233150000006.942QAM 25623243230000006.842QAM 2562425331000000742QAM 25625263390000006.942QAM 25626273470000007.342QAM 25627283550000007.442QAM 25628293630000007.842QAM 25629303710000008.142QAM 25630313790000008.542QAM 256313.0 Downstream channelsChannelLocked StatusRxMER (dB)Pre RS ErrorsPost RS Errors1Locked42002Locked42003Locked42004Locked42005Locked42006Locked42007Locked42008Locked42009Locked420010Locked420011Locked420012Locked420013Locked420014Locked420015Locked420016Locked420017Locked420018Locked420019Locked420020Locked420021Locked420022Locked420023Locked420024Locked420025Locked420026Locked420027Locked420028Locked420029Locked420030Locked420031Locked42003.1 Downstream channelsChannelChannel Width (MHz)FFT TypeNumber of Active SubcarriersModulation (Active Profile)First Active Subcarrier (Hz)33944K1840QAM 409611083.1 Downstream channelsChannel IDLocked StatusRxMER Data (dB)PLC Power (dBmV)Corrected errors (Active Profile)Uncorrectable errors (Active Profile)33Locked07.239940160

3.0 Upstream channelsChannelFrequency (Hz)Power (dBmV)Symbol Rate (ksps)ModulationChannel ID04960000045.85120QAM 64114310000045.85120QAM 64223660000045.35120QAM 64333010000045.35120QAM 64442360000045.85120QAM 6453.0 Upstream channelsChannelChannel TypeT1 TimeoutsT2 TimeoutsT3 TimeoutsT4 Timeouts0ATDMA00101ATDMA00002ATDMA00003ATDMA00004ATDMA00003.1 Upstream channelsChannelChannel Width (MHz)Power (dBmV)FFT TypeModulation610.440.72KQAM 2563.1 Upstream channelsChannelChannel TypeNumber of Active SubcarriersFirst Active Subcarrier (Hz)T3 TimeoutsT4 Timeouts6OFDMA2087400000000

General ConfigurationNetwork accessAllowedMaximum Number of CPEs3Baseline PrivacyEnabledDOCSIS Mode3.1Config filecmreg-vmdg660-bbt053+voc-b.cmPrimary Downstream Service FlowSFID345854Max Traffic Rate575000085 bpsMax Traffic Burst42600bytesMin Traffic Rate0 bpsSFID345856Max Traffic Rate128000 bpsMax Traffic Burst3044bytesMin Traffic Rate0 bpsPrimary Upstream Service FlowSFID345853Max Traffic Rate55000085 bpsMax Traffic Burst42600bytesMin Traffic Rate0 bpsMax Concatenated Burst42600bytesScheduling TypeBest EffortSFID345855Max Traffic Rate128000 bpsMax Traffic Burst3044bytesMin Traffic Rate0 bpsMax Concatenated Burst1522bytesScheduling TypeBest Effort

Flashing red light on SH5, but internet appears to work

14 Replies

hammic

Up to speed

22 days ago

3.0 Downstream channels

Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
1	243000000	6.6	42	QAM 256	14
2	139000000	6.8	42	QAM 256	1
3	147000000	6.8	42	QAM 256	2
4	155000000	7	42	QAM 256	3
5	163000000	6.8	42	QAM 256	4
6	171000000	6.8	42	QAM 256	5
7	179000000	6.6	42	QAM 256	6
8	187000000	6.7	42	QAM 256	7
9	195000000	6.7	42	QAM 256	8
10	203000000	6.7	42	QAM 256	9
11	211000000	6.8	42	QAM 256	10
12	219000000	6.9	42	QAM 256	11
13	227000000	6.8	42	QAM 256	12
14	235000000	6.8	42	QAM 256	13
15	251000000	6.6	42	QAM 256	15
16	259000000	6.3	42	QAM 256	16
17	267000000	6.5	42	QAM 256	17
18	275000000	6.2	42	QAM 256	18
19	283000000	6.5	42	QAM 256	19
20	291000000	6.6	42	QAM 256	20
21	299000000	6.8	42	QAM 256	21
22	307000000	6.6	42	QAM 256	22
23	315000000	6.9	42	QAM 256	23
24	323000000	6.8	42	QAM 256	24
25	331000000	7	42	QAM 256	25
26	339000000	6.9	42	QAM 256	26
27	347000000	7.3	42	QAM 256	27
28	355000000	7.4	42	QAM 256	28
29	363000000	7.8	42	QAM 256	29
30	371000000	8.1	42	QAM 256	30
31	379000000	8.5	42	QAM 256	31

3.0 Downstream channels

Channel	Locked Status	RxMER (dB)	Pre RS Errors	Post RS Errors
1	Locked	42	0	0
2	Locked	42	0	0
3	Locked	42	0	0
4	Locked	42	0	0
5	Locked	42	0	0
6	Locked	42	0	0
7	Locked	42	0	0
8	Locked	42	0	0
9	Locked	42	0	0
10	Locked	42	0	0
11	Locked	42	0	0
12	Locked	42	0	0
13	Locked	42	0	0
14	Locked	42	0	0
15	Locked	42	0	0
16	Locked	42	0	0
17	Locked	42	0	0
18	Locked	42	0	0
19	Locked	42	0	0
20	Locked	42	0	0
21	Locked	42	0	0
22	Locked	42	0	0
23	Locked	42	0	0
24	Locked	42	0	0
25	Locked	42	0	0
26	Locked	42	0	0
27	Locked	42	0	0
28	Locked	42	0	0
29	Locked	42	0	0
30	Locked	42	0	0
31	Locked	42	0	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	0	7.2	3994016	0

hammic
Up to speed
22 days ago
3.0 Upstream channels
Channel
Frequency (Hz)
Power (dBmV)
Symbol Rate (ksps)
Modulation
Channel ID
0
49600000
45.8
5120
QAM 64
1
1
43100000
45.8
5120
QAM 64
2
2
36600000
45.3
5120
QAM 64
3
3
30100000
45.3
5120
QAM 64
4
4
23600000
45.8
5120
QAM 64
5
3.0 Upstream channels
Channel
Channel Type
T1 Timeouts
T2 Timeouts
T3 Timeouts
T4 Timeouts
0
ATDMA
0
0
1
0
1
ATDMA
0
0
0
0
2
ATDMA
0
0
0
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
40.7
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

Channel	Frequency (Hz)	Power (dBmV)	Symbol Rate (ksps)	Modulation	Channel ID
0	49600000	45.8	5120	QAM 64	1
1	43100000	45.8	5120	QAM 64	2
2	36600000	45.3	5120	QAM 64	3
3	30100000	45.3	5120	QAM 64	4
4	23600000	45.8	5120	QAM 64	5

Channel	Channel Type	T3 Timeouts
0	ATDMA	1
1	ATDMA	0
2	ATDMA	0
3	ATDMA	0
4	ATDMA	0

Channel	Channel Width (MHz)	Power (dBmV)	FFT Type	Modulation
6	10.4	40.7	2K	QAM 256

Channel	Channel Type	Number of Active Subcarriers	First Active Subcarrier (Hz)	T3 Timeouts	T4 Timeouts
6	OFDMA	208	74000000	0	0

hammic

Up to speed

22 days ago

General Configuration

Network access	Allowed
Maximum Number of CPEs	3
Baseline Privacy	Enabled
DOCSIS Mode	3.1
Config file	cmreg-vmdg660-bbt053+voc-b.cm

Primary Downstream Service Flow

SFID	345854
Max Traffic Rate	575000085 bps
Max Traffic Burst	42600bytes
Min Traffic Rate	0 bps
SFID	345856
Max Traffic Rate	128000 bps
Max Traffic Burst	3044bytes
Min Traffic Rate	0 bps

Primary Upstream Service Flow

SFID	345853
Max Traffic Rate	55000085 bps
Max Traffic Burst	42600bytes
Min Traffic Rate	0 bps
Max Concatenated Burst	42600bytes
Scheduling Type	Best Effort
SFID	345855
Max Traffic Rate	128000 bps
Max Traffic Burst	3044bytes
Min Traffic Rate	0 bps
Max Concatenated Burst	1522bytes
Scheduling Type	Best Effort

hammic

Up to speed

22 days ago

Network Log

Time	Priority	Description
18-10-2025 01:07:01	notice	REGISTRATION COMPLETE - Waiting for Operational status
18-10-2025 01:06:51	notice	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
18-10-2025 01:06:49	warning	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
18-10-2025 01:06:47	notice	Honoring MDD; IP provisioning mode = IPv4
18-10-2025 01:06:42	critical	No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
18-10-2025 01:06:38	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
18-10-2025 01:06:36	critical	Cable Modem Reboot because of - HW or Power-On Reset
17-10-2025 00:59:20	critical	No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
17-10-2025 00:59:15	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
17-10-2025 00:59:15	critical	Cable Modem Reboot because of - HW or Power-On Reset
14-10-2025 18:03:56	critical	Cable Modem Reboot because of - HW or Power-On Reset
14-10-2025 18:03:56	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
14-10-2025 18:01:08	critical	No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
14-10-2025 18:01:04	critical	Cable Modem Reboot because of - HW or Power-On Reset
14-10-2025 18:01:04	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
10-10-2025 09:03:02	critical	No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
10-10-2025 09:02:56	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
10-10-2025 09:02:55	critical	Cable Modem Reboot because of - HW or Power-On Reset
10-10-2025 02:48:27	critical	No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
10-10-2025 02:48:23	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
10-10-2025 02:48:22	critical	Cable Modem Reboot because of - Software_Upgrade
10-10-2025 02:46:16	alert	SW download Successful - Via NMS
10-10-2025 02:43:41	alert	SW Download INIT - Via NMS
09-10-2025 18:30:00	critical	No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
09-10-2025 18:29:54	critical	Cable Modem Reboot because of - HW or Power-On Reset
09-10-2025 18:29:54	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
04-10-2025 16:24:39	critical	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
04-10-2025 16:24:39	critical	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
04-10-2025 16:23:31	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
01-10-2025 00:32:12	critical	No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
01-10-2025 00:32:07	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
01-10-2025 00:32:06	critical	Cable Modem Reboot because of - HW or Power-On Reset

legacy1
Alessandro Volta
22 days ago
VM have not got a clue what Flashing red light mean in router mode I get a green light in modem mode. The one who does the firmware likely linked the Flashing red light too “Your wifi device is too far away bring it closer”.
Adduxi
Very Insightful Person
22 days ago
There are a lot of power cycles in that log? Are you doing this? If not, setup a BQM to see what your incoming circuit is doing. http://www.thinkbroadband.com/ping
- hammic
  Up to speed
  20 days ago
  Yes, I've powered the SH5 on and off a few times recently.
  I have another engineer coming out in a few days, so perhaps I'll know more shortly.
  - Carley_S
    Forum Team
    17 days ago
    Hi hammic
    Welcome back to the Community Forums.
    Sorry to hear of your concerns with the flashing light on your router.
    Please do let us know if you've any further concerns after your appointment. We'll be here to help on the Community Forums if needed.
mingsy
Superfast
19 days ago
I can't help with this but has there been any recent Hub5 firmware updates? I ask as my router now goes through the 30-60 second flashing red LED on reboot and it never used to do that and there is more than one thread mentioning this boot sequence. I have no internet issues and BQM is fine. Until the last few weeks I'd never seen a flashing red light on my Hub.
IoanaNeacsu
Superfast
19 days ago
Hello, I have the flashing red light for about a minute on my SH5 too after restart but internet works fine. The first time happened on Friday or Saturday night, suddenly red light flashed for maximum a minute I think but internet worked fine. Today I turned off the power and waited for 5 minutes, turned it back on all good after restart, flashing white light, then flashing red light and then it’s the usual white light. I checked my BQM all seems ok. I can say that the speed it’s even a bit better, on my IPhone 16 Pro Max I previously got 1170Mbps now I got 1199Mbps download and 106 or 107Mbps upload but during the test it goes up to 120Mbps. So, as many people started to have this I think it’s not an issue as long as the internet works normally. It definitely is something with the software of the Hub too. Fun fact when I go now on my phone on Safari to the hub website, 192.168.0.1 it says that connection is not private and that the website might be impersonated. I’ve attached a screenshot with this. It does like this on any other browser or device.
hammic
Up to speed
9 days ago
Just posting as a continuation and to confirm that this red light issue is still ongoing.
Last night, during normal use, the red light flashed for no apparent reason. Again, nothing was shown at this time in the network log - basically, as though nothing had happened.
I am beginning to notice that odd time the red light does flash, is late evening, from around 10pm until midnight.
Adduxi
Very Insightful Person
9 days ago
Is there anything on a timer that may be interfering? Can you move the power supply to another socket, even on a temporary long extension lead? Do any other mains powered devices show any signs of issues, flickering etc.?
Only asking as I used to get electrical "brown outs" where we live, and had to get a UPS. Fast forward a few years, and the area had now got a new sub station transformer fitted. The power drops have ceased, but I've still kept the UPS.
- hammic
  Up to speed
  8 days ago
  I get virtually no power cuts where I live. I believe the last power cut was maybe 10 years ago, possibly even longer than that.
  There's no timers in my house, let alone plugged in, so I'm absolutely certain it's nothing on a timer.
  I will try the SuperHub 5 on another socket, with the use of an extension and report back. That's a good suggestion worth investigating. If nothing else, it would help to rule out the power in the house.
  I'm thinking of trying to power the SuperHub from a power bank, but I don't think there's any suitable adapters that would let me do this. That would definitely help to rule out power in my house as well as the SuperHub's PSU.
  - Akua_A
    Forum Team
    6 days ago
    Thank you for getting back to us hammic Sorry the hear the issue still persists. We are sending you a private message to best look into this. 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,

Forum Discussion

Flashing red light on SH5, but internet appears to work

14 Replies

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