Why do I have so many T3 timeouts?

[meeeeehmet]

Hi

I'm checking my Superhub 2ac network log and I have a lot of T3 timeouts as shown below. Frequently, my Superhub seems to be restarting by itself and has been dropping connections too. Any reasons as to why this may be happening?

Network Log

First Time	Last Time	Priority	Error Number	Description
15/08/2020 14:07:00 GMT	15/08/2020 14:07:00 GMT	Warning (5)	66050310	Auth Success - Web login successful.
15/08/2020 14:06:54 GMT	15/08/2020 14:06:54 GMT	Error (4)	68010302	DHCP WAN IP - **.**.***.***
15/08/2020 14:05:51 GMT	15/08/2020 14:05:51 GMT	Error (4)	68000407	TOD established
Time Not Established	Time Not Established	Critical (3)	82000200	No Ranging Response received - T3 time-out
Time Not Established	Time Not Established	Notice (6)	84000510	Downstream Locked Successfully
15/08/2020 13:52:42 GMT	15/08/2020 13:52:42 GMT	Warning (5)	66050310	Auth Success - Web login successful.
14/08/2020 17:10:26 GMT	14/08/2020 17:10:26 GMT	Warning (5)	66050310	Auth Success - Web login successful.
13/08/2020 01:18:34 GMT	13/08/2020 01:18:34 GMT	Error (4)	68010302	DHCP WAN IP - **.***.***.***
13/08/2020 01:17:48 GMT	13/08/2020 01:17:48 GMT	Error (4)	68000407	TOD established
13/08/2020 01:17:38 GMT	13/08/2020 01:17:38 GMT	Notice (6)	84000510	Downstream Locked Successfully
13/08/2020 01:17:32 GMT	13/08/2020 01:17:32 GMT	Critical (3)	82000200	No Ranging Response received - T3 time-out
13/08/2020 01:17:32 GMT	13/08/2020 01:17:32 GMT	Critical (3)	82000200	No Ranging Response received - T3 time-out
13/08/2020 01:17:32 GMT	13/08/2020 01:17:32 GMT	Critical (3)	82000200	No Ranging Response received - T3 time-out
13/08/2020 01:17:32 GMT	13/08/2020 01:17:32 GMT	Critical (3)	82000200	No Ranging Response received - T3 time-out
13/08/2020 01:17:31 GMT	13/08/2020 01:17:31 GMT	Critical (3)	82000700	Unicast Ranging Received Abort Response - initializing MAC
13/08/2020 01:17:31 GMT	13/08/2020 01:17:31 GMT	Critical (3)	82000700	Unicast Ranging Received Abort Response - initializing MAC
13/08/2020 01:17:31 GMT	13/08/2020 01:17:31 GMT	Critical (3)	82000700	Unicast Ranging Received Abort Response - initializing MAC
13/08/2020 01:17:31 GMT	13/08/2020 01:17:31 GMT	Critical (3)	82000700	Unicast Ranging Received Abort Response - initializing MAC
13/08/2020 01:17:13 GMT	13/08/2020 01:17:13 GMT	Critical (3)	82000200	No Ranging Response received - T3 time-out
13/08/2020 01:16:49 GMT	13/08/2020 01:16:49 GMT	Critical (3)	82000200	No Ranging Response received - T3 time-out

Downstream  DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8

Frequency (Hz)	139000000	147000000	155000000	163000000	171000000	179000000	187000000	195000000
Lock Status(QAM Lock/FEC Sync/MPEG Lock)	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked
Channel ID	1	2	3	4	5	6	7	8
Modulation	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM
Symbol Rate (Msym/sec)	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000
Interleave Depth	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17
Power Level (dBmV)	-0.32	-0.76	-1.18	-1.79	-2.13	-2.51	-2.90	-3.00
RxMER (dB)	37.09	37.36	37.64	37.94	38.26	37.94	37.94	37.94
Pre RS Errors	449	387	292	301	292	866	302	299
Post RS Errors	287	291	279	297	289	866	302	299

Upstream  US-1 US-2 US-3 US-4

Channel Type	2.0	2.0	2.0	2.0
Channel ID	8	6	5	7
Frequency (Hz)	39400000	53700000	60300000	46200000
Ranging Status	Success	Success	Success	Success
Modulation	32QAM	64QAM	64QAM	64QAM
Symbol Rate (Sym/sec)	5120000	5120000	5120000	5120000
Mini-Slot Size	2	2	2	2
Power Level (dBmV)	51.00	51.00	51.00	51.00
T1 Timeouts	0	0	0	0
T2 Timeouts	0	0	0	0
T3 Timeouts	1	0	0	0
T4 Timeouts	0	0	0	0

Upstream Burst  Req(1) Init Maint(3) Per Maint(4) Adv Short(9) Adv Long(10) Adv UGS(11)

Modulation Type	16QAM	QPSK	16QAM	32QAM	32QAM	16QAM
Differential Encoding	OFF	OFF	OFF	OFF	OFF	OFF
Preamble Length	56	640	384	104	104	104
Preamble Value Offset	652	0	0	716	716	716
FEC Error Correction (T)	0	5	5	8	13	5
FEC Codeword Information Bytes (K)	16	34	34	114	220	86
Maximum Burst Size	0	0	0	4	255	255
Guard Time Size	8	48	48	8	8	8
Last Codeword Length	Fixed	Fixed	Fixed	Shortened	Shortened	Shortened
Scrambler On/Off	ON	ON	ON	ON	ON	ON

[meeeeehmet]

Ah, I see

In this case then what's going to happen with all the T3 and T4 time-outs? Will I get an engineer sent out?

[Anonymous]

Only VM can answer the question regarding an engineer visit.

This thread has been flagged so it should be picked up soon (Probably tomorrow morning).

[meeeeehmet]

This is what happened in the first picture as I took the coax cable out of the hub 3 while unscrewing it. I pushed it back in the metal thingy (I don't know what it's called please correct me on this), and I fixed it for now. I think I also need a new coax cable.

Keep in mind, when I got my replacement hub 3, I didn't get a coax isolator cable, neither did I get a spare ethernet cable. At the same time though, I have a feeling my problems aren't caused by the coax cable. What do you guys think?

[-tony-]

theres certainly a problem with the coax cable - it looks home made - the ends should be crimped on that looks like a DIY screw on one 

if its a DIY job from earlier user then the cable could also be the wrong spec

i flagged the thread last night so lets wait for VM

[DavidJWalker]

thats the wrong coax cable thats a DIY one i think you should ring up and get it replaced and that cable is not shelded like the virgin media ones and you can mess up the network on your street with that cable

[nikkinemo95]

as said above the upstream was out of spec at 51 on the old hub - or was said to be in the past - they now seem to accept 52 but generally if you dont have problem - if its the same on the hub3 - it displays as 5.1 for 51 as theres bug in the reporting software i would push for a tech to reduce them

[meeeeehmet]

My house is ~27 years old, I’m guessing some of the cabling might be done from ntl telewest days but Virgin have never been bothered to change the cabling.

I’m glad to hear a coax cable might be the reason behind all of this though. It would be great if someone replaced this for me. 🙂

[John_GS]

Hi meeeeehmet

Thanks for coming back to us. It does need a technician. I'll PM you now to advise further.

Kind regards,

[John_GS]

Thanks for joining me on PM, meeeeehmet,

Just to update the thread, the engineer visit has been booked in

Kind regards,

[meeeeehmet]

UPDATE:

The engineer came today. He said the coaxial cable is fine, he only changed the connector bit where it plugs into the hub 3. He also attached a 6dB attenuator. In addition, he changed the splitter in the brown box outside my house, he said it's not a VM part so he changed that for me.

He also did a few things in the black cabinet accross my street. These are the new figures:

Downstream bonded channels

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

1	227000000	1.5	38	256 qam	12
2	219000000	1.5	40	256 qam	11
3	235000000	1.4	38	256 qam	13
4	243000000	1.2	38	256 qam	14
5	251000000	1.2	40	256 qam	15
6	259000000	1.2	40	256 qam	16
7	267000000	1	38	256 qam	17
8	275000000	1	38	256 qam	18
9	283000000	0.9	40	256 qam	19
10	291000000	0.7	38	256 qam	20
11	299000000	0.7	38	256 qam	21
12	307000000	1	38	256 qam	22
13	315000000	1.5	40	256 qam	23
14	323000000	1.7	38	256 qam	24
15	331000000	1.5	40	256 qam	25
16	339000000	2	40	256 qam	26
17	347000000	2.2	40	256 qam	27
18	355000000	2	40	256 qam	28
19	363000000	1.7	40	256 qam	29
20	371000000	1.7	40	256 qam	30
21	379000000	1.4	38	256 qam	31
22	387000000	1.5	40	256 qam	32
23	395000000	1.5	40	256 qam	33
24	403000000	1.4	40	256 qam	34

Downstream bonded channels

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

1	Locked	38.9	7	0
2	Locked	40.3	8	0
3	Locked	38.6	7	0
4	Locked	38.9	4	0
5	Locked	40.3	3	0
6	Locked	40.3	40406275	0
7	Locked	38.9	6	0
8	Locked	38.9	4	0
9	Locked	40.3	5	0
10	Locked	38.6	5	0
11	Locked	38.9	5	0
12	Locked	38.6	5	0
13	Locked	40.3	4	0
14	Locked	38.9	5	0
15	Locked	40.3	4	0
16	Locked	40.3	4	0
17	Locked	40.3	4	0
18	Locked	40.3	4	0
19	Locked	40.3	5	0
20	Locked	40.3	4	0
21	Locked	38.9	5	0
22	Locked	40.3	5	0
23	Locked	40.9	5	0
24	Locked	40.3	11	0

Upstream bonded channels

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

1	53700424	5.1	5120	64 qam	6
2	60300258	5.1	5120	64 qam	5
3	46200277	5.1	5120	64 qam	7
4	39400049	5.1	5120	64 qam	8

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	0	0
4	ATDMA	0	0	0	0

Hopefully the T3/T4 time-outs have been resolved! Will update on this forum if I continue to get them.