Over the last few months, I've been experiencing dropouts and latency issues on my Virgin home broadband, which impacts wired and wireless connections. This particularly affects WiFi calls, Video calls, and streaming. We recently switched over to Virgin from Vodafone and are using it in MODEM mode. The problem was particularly bad when work was being done on our local network (fitting fibre). I've had multiple technician visits who have checked all the connections, (replacing some due to observed poor terminations), fitted a new Hub 5 and run numerous tests on power to the house and router, which they report as within normal limits, noting that we are several hundred meters from the street cabinet. For a few weeks after the last visit, things were markedly better, but then it deteriorated again, and we now get daily problems.One difficulty is that the problem is intermittent, so whilst all may be good for a few days, we then have days of problems. I'd really appreciate any help at all getting to the root cause of this, as I find it very difficult getting hold of anyone via Virgin Customer Services to do more than book a repeat appointment, eventually resulting in a technician visiting to repeat the same things! Based on advice in other posts that I've read, I'm attaching here the log details, which I'd be really grateful if someone could kindly review and provide feedback on what I should do! MANY thanks in advance...Example graphs from BQM follow on variety of days: Cable Modem StatusItemStatusTypeCable Modem StatusOnlineDOCSIS 3.0Primary downstream channelLockedSC-QAMChannel OverviewDownstreamUpstreamDOCSIS 3.0 channels315DOCSIS 3.1 channels11Data follows...

3.0 Downstream channelsChannelFrequency (Hz)Power (dBmV)SNR (dB)ModulationChannel ID13060000000.541QAM 2562221380000001.339QAM 256131460000001.139QAM 256241540000001.239QAM 256351620000001.239QAM 256461700000000.939QAM 256571780000000.940QAM 256681860000000.840QAM 256791940000000.940QAM 2568102020000000.740QAM 2569112100000000.740QAM 25610122180000000.740QAM 25611132260000000.740QAM 25612142340000000.840QAM 25613152420000000.740QAM 25614162500000000.440QAM 25615172580000000.441QAM 25616182660000000.440QAM 25617192740000000.341QAM 25618202820000000.641QAM 25619212900000000.641QAM 25620222980000000.641QAM 25621233140000000.340QAM 25623243220000000.140QAM 25624253300000000.340QAM 25625263380000000.341QAM 25626273460000000.341QAM 25627283540000000.441QAM 25628293620000000.341QAM 25629303700000000.541QAM 25630313780000000.741QAM 256313.0 Downstream channelsChannelLocked StatusRxMER (dB)Pre RS ErrorsPost RS Errors1Locked4120802Locked3945003Locked3943204Locked3938605Locked3934606Locked3932307Locked4029908Locked4031409Locked40263010Locked40296011Locked40287012Locked40248013Locked40245014Locked40233015Locked40188016Locked40204017Locked41224018Locked40209019Locked41215020Locked41196021Locked41181022Locked41209023Locked40259024Locked40264025Locked40232026Locked41254027Locked41197028Locked41190029Locked41205030Locked41201031Locked4124803.1 Downstream channelsChannelChannel Width (MHz)FFT TypeNumber of Active SubcarriersModulation (Active Profile)First Active Subcarrier (Hz)33924K1800QAM 409611283.1 Downstream channelsChannel IDLocked StatusRxMER Data (dB)PLC Power (dBmV)Corrected errors (Active Profile)Uncorrectable errors (Active Profile)33Locked41-2.961775836878

3.0 Upstream channelsChannelFrequency (Hz)Power (dBmV)Symbol Rate (ksps)ModulationChannel ID049600000485120QAM 64114310000047.85120QAM 64223660000047.55120QAM 643330100000475120QAM 64442360000046.85120QAM 6453.0 Upstream channelsChannelChannel TypeT1 TimeoutsT2 TimeoutsT3 TimeoutsT4 Timeouts0ATDMA00001ATDMA00002ATDMA00003ATDMA00004ATDMA00203.1 Upstream channelsChannelChannel Width (MHz)Power (dBmV)FFT TypeModulation610.443.52KQAM 2563.1 Upstream channelsChannelChannel TypeNumber of Active SubcarriersFirst Active Subcarrier (Hz)T3 TimeoutsT4 Timeouts6OFDMA2087400000000 General ConfigurationNetwork accessAllowedMaximum Number of CPEs1Baseline PrivacyEnabledDOCSIS Mode3.1Config filecmreg-vmdg660-bbt060-b.cmPrimary Downstream Service FlowSFID86136Max Traffic Rate287500061 bpsMax Traffic Burst42600bytesMin Traffic Rate0 bpsPrimary Upstream Service FlowSFID86135Max Traffic Rate27500061 bpsMax Traffic Burst42600bytesMin Traffic Rate0 bpsMax Concatenated Burst42600bytesScheduling TypeBest Effort

Live BWM Link: https://www.thinkbroadband.com/broadband/monitoring/quality/share/d74903c23ad7b08997819a83b42346cb99687fca

Yes intermittent are hard cases as your in modem mode BQM would be to your router/device so cable could be a problem or your router/device.it be best to get a new cable and hook a PC to the hub in modem mode you can get another NIC PCI-e/USB to do internet connection sharing with your router as you test BQM to your PC. Or put hub in router mode but then this might show fine but the LAN ports are bad on the hub

Network Log:Time Priority Description 09-05-2025 12:38:00 notice GUI Login Status - Login Success from LAN interface 09-05-2025 12:09:14 notice GUI Login Status - Login Success from LAN interface 09-05-2025 11:43:25 notice GUI Login Status - Login Success from LAN interface 03-05-2025 09:15:21 error DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 30-04-2025 07:25:44 notice REGISTRATION COMPLETE - Waiting for Operational status 30-04-2025 07:25:39 warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 30-04-2025 07:25:38 warning Dynamic Range Window violation 30-04-2025 07:25:38 warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 30-04-2025 07:25:31 notice DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 30-04-2025 07:25:30 notice TLV-11 - unrecognized OID;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 30-04-2025 07:25:23 warning DHCP WARNING - Non-critical field invalid in response ;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 30-04-2025 07:25:21 notice Honoring MDD; IP provisioning mode = IPv4 30-04-2025 07:25:12 critical No Ranging Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 30-04-2025 07:25:06 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 30-04-2025 07:25:04 critical Cable Modem Reboot because of - HW or Power-On Reset 04-04-2025 13:12:50 critical No Ranging Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 04-04-2025 13:12:43 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 04-04-2025 13:12:41 critical Cable Modem Reboot because of - Reboot UI 04-04-2025 10:48:14 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 04-04-2025 10:48:14 critical 16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 04-04-2025 10:47:06 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 01-04-2025 10:52:31 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 01-04-2025 10:52:26 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 01-04-2025 10:52:21 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1; 01-04-2025 10:52:20 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;

Connection Issues - Dropped packets and variable latency

Cable Modem Status
Cable Modem Status	Online	DOCSIS 3.0
Primary downstream channel	Locked	SC-QAM
Channel Overview	Downstream	Upstream
DOCSIS 3.0 channels	31	5
DOCSIS 3.1 channels	1	1

11 Replies

martin10991

Joining in

14 days ago

3.0 Downstream channels

Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
1	306000000	0.5	41	QAM 256	22
2	138000000	1.3	39	QAM 256	1
3	146000000	1.1	39	QAM 256	2
4	154000000	1.2	39	QAM 256	3
5	162000000	1.2	39	QAM 256	4
6	170000000	0.9	39	QAM 256	5
7	178000000	0.9	40	QAM 256	6
8	186000000	0.8	40	QAM 256	7
9	194000000	0.9	40	QAM 256	8
10	202000000	0.7	40	QAM 256	9
11	210000000	0.7	40	QAM 256	10
12	218000000	0.7	40	QAM 256	11
13	226000000	0.7	40	QAM 256	12
14	234000000	0.8	40	QAM 256	13
15	242000000	0.7	40	QAM 256	14
16	250000000	0.4	40	QAM 256	15
17	258000000	0.4	41	QAM 256	16
18	266000000	0.4	40	QAM 256	17
19	274000000	0.3	41	QAM 256	18
20	282000000	0.6	41	QAM 256	19
21	290000000	0.6	41	QAM 256	20
22	298000000	0.6	41	QAM 256	21
23	314000000	0.3	40	QAM 256	23
24	322000000	0.1	40	QAM 256	24
25	330000000	0.3	40	QAM 256	25
26	338000000	0.3	41	QAM 256	26
27	346000000	0.3	41	QAM 256	27
28	354000000	0.4	41	QAM 256	28
29	362000000	0.3	41	QAM 256	29
30	370000000	0.5	41	QAM 256	30
31	378000000	0.7	41	QAM 256	31

3.0 Downstream channels

Channel	Locked Status	RxMER (dB)	Pre RS Errors	Post RS Errors
1	Locked	41	208	0
2	Locked	39	450	0
3	Locked	39	432	0
4	Locked	39	386	0
5	Locked	39	346	0
6	Locked	39	323	0
7	Locked	40	299	0
8	Locked	40	314	0
9	Locked	40	263	0
10	Locked	40	296	0
11	Locked	40	287	0
12	Locked	40	248	0
13	Locked	40	245	0
14	Locked	40	233	0
15	Locked	40	188	0
16	Locked	40	204	0
17	Locked	41	224	0
18	Locked	40	209	0
19	Locked	41	215	0
20	Locked	41	196	0
21	Locked	41	181	0
22	Locked	41	209	0
23	Locked	40	259	0
24	Locked	40	264	0
25	Locked	40	232	0
26	Locked	41	254	0
27	Locked	41	197	0
28	Locked	41	190	0
29	Locked	41	205	0
30	Locked	41	201	0
31	Locked	41	248	0

3.1 Downstream channels

Channel	Channel Width (MHz)	FFT Type	Number of Active Subcarriers	Modulation (Active Profile)	First Active Subcarrier (Hz)
33	92	4K	1800	QAM 4096	1128

3.1 Downstream channels

Channel ID	Locked Status	RxMER Data (dB)	PLC Power (dBmV)	Corrected errors (Active Profile)	Uncorrectable errors (Active Profile)
33	Locked	41	-2.9	617758368	78

martin10991
Joining in
14 days ago
3.0 Upstream channels
Channel
Frequency (Hz)
Power (dBmV)
Symbol Rate (ksps)
Modulation
Channel ID
0
49600000
48
5120
QAM 64
1
1
43100000
47.8
5120
QAM 64
2
2
36600000
47.5
5120
QAM 64
3
3
30100000
47
5120
QAM 64
4
4
23600000
46.8
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
0
0
3
ATDMA
0
0
0
0
4
ATDMA
0
0
2
0
3.1 Upstream channels
Channel
Channel Width (MHz)
Power (dBmV)
FFT Type
Modulation
6
10.4
43.5
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

General Configuration
Network access
Allowed
Maximum Number of CPEs
1
Baseline Privacy
Enabled
DOCSIS Mode
3.1
Config file
cmreg-vmdg660-bbt060-b.cm
Primary Downstream Service Flow
SFID
86136
Max Traffic Rate
287500061 bps
Max Traffic Burst
42600bytes
Min Traffic Rate
0 bps
Primary Upstream Service Flow
SFID
86135
Max Traffic Rate
27500061 bps
Max Traffic Burst
42600bytes
Min Traffic Rate
0 bps
Max Concatenated Burst
42600bytes
Scheduling Type
Best Effort
martin10991
Joining in
14 days ago
Live BWM Link: https://www.thinkbroadband.com/broadband/monitoring/quality/share/d74903c23ad7b08997819a83b42346cb99687fca
- martin10991
  Joining in
  14 days ago
  Network Log
  Time      Priority Description
  09-05-2025 12:38:00     notice    GUI Login Status - Login Success from LAN interface
  09-05-2025 12:09:14     notice    GUI Login Status - Login Success from LAN interface
  09-05-2025 11:43:25     notice    GUI Login Status - Login Success from LAN interface
  03-05-2025 09:15:21     error      DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  30-04-2025 07:25:44     notice    REGISTRATION COMPLETE - Waiting for Operational status
  30-04-2025 07:25:39     warning                RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  30-04-2025 07:25:38     warning                Dynamic Range Window violation
  30-04-2025 07:25:38     warning                RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  30-04-2025 07:25:31     notice    DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  30-04-2025 07:25:30     notice    TLV-11 - unrecognized OID;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  30-04-2025 07:25:23     warning                DHCP WARNING - Non-critical field invalid in response ;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  30-04-2025 07:25:21     notice    Honoring MDD; IP provisioning mode = IPv4
  30-04-2025 07:25:12     critical   No Ranging Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  30-04-2025 07:25:06     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  30-04-2025 07:25:04     critical   Cable Modem Reboot because of - HW or Power-On Reset
  04-04-2025 13:12:50     critical   No Ranging Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  04-04-2025 13:12:43     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  04-04-2025 13:12:41     critical   Cable Modem Reboot because of - Reboot UI
  04-04-2025 10:48:14     critical   Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  04-04-2025 10:48:14     critical   16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  04-04-2025 10:47:06     critical   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:52:31     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:52:26     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:52:21     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:52:20     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:52:00     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:52:00     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:51:59     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:51:59     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:51:59     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:51:58     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:49:26     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:49:26     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:42:09     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
  01-04-2025 10:42:07     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
legacy1
Alessandro Volta
14 days ago
Yes intermittent are hard cases as your in modem mode BQM would be to your router/device so cable could be a problem or your router/device.
it be best to get a new cable and hook a PC to the hub in modem mode you can get another NIC PCI-e/USB to do internet connection sharing with your router as you test BQM to your PC. Or put hub in router mode but then this might show fine but the LAN ports are bad on the hub
- martin10991
  Joining in
  14 days ago
  thanks, sorry: I mis-read the hub's pages: I'm using it in Router Mode. All the stats/tests were with the unit set up like that.
  (we were previously using Virgin in Modem mode with a separate Router; replacing that setup with the new Hub in Router mode seemed to improve overall latency, but I'm still left with the variability and drop outs shown in the BQM pictures)
  - Robert_P
    Forum Team
    11 days ago
    Hello martin10991
    
    Sorry to hear of the intermittent connection issues impacting both your wired and wireless connections, we appreciate you raising it with us via the forums and welcome to the community.
    
    We're eager to take a closer look at this for you and I will send you a Private Message, please keep an eye out in the top right when signed into the forums for the envelope. This is where you will be able to find my Private Message and be able to respond.
martin10991
Joining in
14 days ago
Network Log:
Time      Priority Description
09-05-2025 12:38:00     notice    GUI Login Status - Login Success from LAN interface
09-05-2025 12:09:14     notice    GUI Login Status - Login Success from LAN interface
09-05-2025 11:43:25     notice    GUI Login Status - Login Success from LAN interface
03-05-2025 09:15:21     error      DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:44     notice    REGISTRATION COMPLETE - Waiting for Operational status
30-04-2025 07:25:39     warning                RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:38     warning                Dynamic Range Window violation
30-04-2025 07:25:38     warning                RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:31     notice    DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:30     notice    TLV-11 - unrecognized OID;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:23     warning                DHCP WARNING - Non-critical field invalid in response ;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:21     notice    Honoring MDD; IP provisioning mode = IPv4
30-04-2025 07:25:12     critical   No Ranging Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:06     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:04     critical   Cable Modem Reboot because of - HW or Power-On Reset
04-04-2025 13:12:50     critical   No Ranging Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
04-04-2025 13:12:43     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
04-04-2025 13:12:41     critical   Cable Modem Reboot because of - Reboot UI
04-04-2025 10:48:14     critical   Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
04-04-2025 10:48:14     critical   16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
04-04-2025 10:47:06     critical   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:31     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:26     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:21     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:20     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
martin10991
Joining in
14 days ago
Network Logs:
Time      Priority Description
09-05-2025 12:38:00     notice    GUI Login Status - Login Success from LAN interface
09-05-2025 12:09:14     notice    GUI Login Status - Login Success from LAN interface
09-05-2025 11:43:25     notice    GUI Login Status - Login Success from LAN interface
03-05-2025 09:15:21     error      DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:44     notice    REGISTRATION COMPLETE - Waiting for Operational status
30-04-2025 07:25:39     warning                RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:38     warning                Dynamic Range Window violation
30-04-2025 07:25:38     warning                RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:31     notice    DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:30     notice    TLV-11 - unrecognized OID;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:23     warning                DHCP WARNING - Non-critical field invalid in response ;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:21     notice    Honoring MDD; IP provisioning mode = IPv4
30-04-2025 07:25:12     critical   No Ranging Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:06     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
30-04-2025 07:25:04     critical   Cable Modem Reboot because of - HW or Power-On Reset
04-04-2025 13:12:50     critical   No Ranging Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
04-04-2025 13:12:43     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
04-04-2025 13:12:41     critical   Cable Modem Reboot because of - Reboot UI
04-04-2025 10:48:14     critical   Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
04-04-2025 10:48:14     critical   16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
04-04-2025 10:47:06     critical   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:31     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:26     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:21     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:20     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:00     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:52:00     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:51:59     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:51:59     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:51:59     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:51:58     critical   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:49:26     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:49:26     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:42:09     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
01-04-2025 10:42:07     critical   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
martin10991
Joining in
14 days ago
CORRECTION: Using it in ROUTER MODE! - sorry.
legacy1
Alessandro Volta
14 days ago
Hard to tell what router mode is doing might be ARP loss to the gateway or just intermittent noise on Docsis

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Connection Issues - Dropped packets and variable latency

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Cable Modem Status
Item	Status	Type
Cable Modem Status	Online	DOCSIS 3.0
Primary downstream channel	Locked	SC-QAM
Channel Overview	Downstream	Upstream
DOCSIS 3.0 channels	31	5
DOCSIS 3.1 channels	1	1

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

Network access	Allowed
Maximum Number of CPEs	1
Baseline Privacy	Enabled
DOCSIS Mode	3.1
Config file	cmreg-vmdg660-bbt060-b.cm

SFID	86136
Max Traffic Rate	287500061 bps
Max Traffic Burst	42600bytes
Min Traffic Rate	0 bps

SFID	86135
Max Traffic Rate	27500061 bps
Max Traffic Burst	42600bytes
Min Traffic Rate	0 bps
Max Concatenated Burst	42600bytes
Scheduling Type	Best Effort

Channel	Frequency (Hz)	Power (dBmV)	Symbol Rate (ksps)	Modulation	Channel ID
0	49600000	48	5120	QAM 64	1
1	43100000	47.8	5120	QAM 64	2
2	36600000	47.5	5120	QAM 64	3
3	30100000	47	5120	QAM 64	4
4	23600000	46.8	5120	QAM 64	5