T3 Errors, No Ranging Response received

[tomxfletcher]

Hi,

I recently moved to a new house and brought my Virgin equipment with me as they offer FTTP.

Ever since then I have had an intermittent connection issue - 2 or 3 times a day I will lose internet for 10 minutes. Obviously a total pain when working from home as reconnecting to Skype calls always takes ages. Thinking it might be a wifi issue with my 3 year old SH3 I purchased a 3rd party Asus router. The problem persisted.

After trying unsuccessfully to get the call centre to help (they seem very focussed on wifi issues) I eventually got an engineer to come out. He upgraded me to a SH4.

However, the issues persist. I have posted the logs below (the same 'no ranging response' errors as before the hub upgrade). Any help appreciated.

Thu 01/01/1970 00:01:21              3              No Ranging Response received - T3 time-out;CM-MAC=**;CMTS-MAC=**;CM-VER=3.1;

Tue 20/07/2021 08:40:31              5              MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**;CMTS-MAC=**;CM-QOS=1.1;CM-VER=3.1;

Tue 20/07/2021 08:40:38              6              SW Download INIT - Via Config file cmreg-vmdg640-bbt062+voc-b.cm

Tue 20/07/2021 08:43:30              5              MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**;CMTS-MAC=**;CM-QOS=1.1;CM-VER=3.1;

Tue 20/07/2021 08:43:31              4              Disruption during SW download - Power Failure

Tue 20/07/2021 08:43:39              6              SW Download INIT - Via Config file cmreg-vmdg640-bbt062+voc-b.cm

Tue 20/07/2021 08:45:03              6              SW download Successful - Via Config file

Tue 20/07/2021 08:48:01              5              MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**;CMTS-MAC=**;CM-QOS=1.1;CM-VER=3.1;

Thu 01/01/1970 00:01:18              3              No Ranging Response received - T3 time-out;CM-MAC=**;CMTS-MAC=**;CM-QOS=1.1;CM-VER=3.1;

Tue 20/07/2021 08:54:53              5              MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**;CMTS-MAC=**;CM-QOS=1.1;CM-VER=3.1;

Tue 20/07/2021 08:59:31              3              SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**;CMTS-MAC=**;CM-QOS=1.1;CM-VER=3.1;

Tue 20/07/2021 08:59:36              5              Lost MDD Timeout;CM-MAC=**;CMTS-MAC=**;CM-QOS=1.1;CM-VER=3.1;

3.0 Downstream channels

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

1	138750000	6.1	39	QAM256	1
2	146750000	6.1	39	QAM256	2
3	154750000	5.8	40.4	QAM256	3
4	162750000	5.7	40.4	QAM256	4
5	170750000	5.8	40.4	QAM256	5
6	178750000	5.9	40.4	QAM256	6
7	186750000	6.1	40.4	QAM256	7
8	194750000	6.3	39	QAM256	8
9	202750000	6.4	40.4	QAM256	9
10	210750000	6.5	40.4	QAM256	10
11	218750000	6.6	40.4	QAM256	11
12	226750000	6.6	40.4	QAM256	12
13	234750000	6.8	40.4	QAM256	13
14	242750000	6.9	40.4	QAM256	14
15	250750000	7	40.4	QAM256	15
16	258750000	7.1	40.4	QAM256	16
17	266750000	7.2	40.4	QAM256	17
18	274750000	7.6	40.4	QAM256	18
19	282750000	7.5	40.4	QAM256	19
20	290750000	7.5	40.4	QAM256	20
21	298750000	7.1	40.4	QAM256	21
22	306750000	7	40.4	QAM256	22
23	314750000	7.4	40.4	QAM256	23
24	322750000	8.1	40.4	QAM256	24
26	370750000	7.4	39	QAM256	26
27	378750000	7.4	39	QAM256	27
28	386750000	7.9	39	QAM256	28
29	394750000	8.1	40.9	QAM256	29
30	402750000	7.8	40.4	QAM256	30
31	410750000	7.5	40.4	QAM256	31
32	418750000	7.7	40.4	QAM256	32
33	426750000	8.2	39	QAM256	33

3.0 Downstream channels

l Lock Status RxMER (dB) Pre RS Errors Post RS Errors

29	Locked	40.946209	7	0
30	Locked	40.366287	0	0
31	Locked	40.366287	0	0
32	Locked	40.366287	0	0
33	Locked	38.983261	0	0

3.0 Upstream channels

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

1	39400000	42.5	5120 KSym/sec	64QAM	10
2	46200000	42.8	5120 KSym/sec	64QAM	9
3	60300000	42.8	5120 KSym/sec	64QAM	7
4	53700000	42.5	5120 KSym/sec	64QAM	8

[jbrennand]

What make model of Asus router did you get?

You could try setting it up again - use this sequence...
----------------------------------------------------------------------

Disconnect all cables from your new router (or Mesh first unit) and unplug it. Put the VM Hub into modem mode ( https://www.virginmedia.com/help/virgin-media-hub-modem-mode ) and wait for the base light to turn magenta/purple (on a Hub3 - but not on a Hub4!).

Once it’s in modem mode, the VM hub “MUST” then be powered off. Then, set up your own router/Mesh with the WAN port set to be in DHCP (& Nat?) mode, it may be pre-set that way anyway. Make sure it’s fully initialised (leave 5 min) and then put in the WAN cable to the VM hub.

NOW… power up the VM hub and you should get a stable connection.