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

[jem101]

Unfortunately you will with those upstream power levels - with any luck the next engineer will do a better job!

[meeeeehmet]

Sigh. I can't be asked to have another engineer to sort this out. I'm just going to have to live with it I guess.

To be honest, he didn't check the network log on the hub 3 and he sort of did his own thing.

[jem101]

it sounds like he didn't do anything much at all - well nothing of any use!

You could try taking that attenuator out, it's doing nothing useful at all.

[meeeeehmet]

If it's not doing anything, why'd he install it in the first place?

[Justin020466]

I too had the problem of the useless customer services saying nothing was wrong with the hub. Complained to a supervisor and explained upstream was too high and managed to get an engineer. First one gave me a hub 4 (no change, No surprise either) Second engineer after another complaint replaced all my internal cabling and from the t to the service box. (better but still High Upstream) Complained again and the next engineer agreed I nee a re-pull back to the cab. This was done two weeks ago and Power levels are sitting nicely in spec Downstream. -7.5 Min 8.5 Max & Upstream 45.8 Min 47.3 max.  Lovely connection now compared to the last 18 months.

[meeeeehmet]

I'm surprised you got the Hub 4, are you on a 100Mb package? If so, I might as well request for one too.

To this day I'm still having T3 timeouts in my network log. VM is a joke. I'm switching to Hyperoptic when they come to my area (which is soon).

Downstream bonded channels

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

1	227000000	2.7	40	256 qam	12
2	219000000	2.7	40	256 qam	11
3	235000000	2.5	38	256 qam	13
4	243000000	2.2	40	256 qam	14
5	251000000	2.2	40	256 qam	15
6	259000000	2.2	40	256 qam	16
7	267000000	2	40	256 qam	17
8	275000000	2	40	256 qam	18
9	283000000	1.9	40	256 qam	19
10	291000000	1.7	40	256 qam	20
11	299000000	1.5	38	256 qam	21
12	307000000	1.7	40	256 qam	22
13	315000000	2.2	40	256 qam	23
14	323000000	2.9	40	256 qam	24
15	331000000	2.9	40	256 qam	25
16	339000000	2.9	40	256 qam	26
17	347000000	3.2	40	256 qam	27
18	355000000	3.4	40	256 qam	28
19	363000000	3	40	256 qam	29
20	371000000	3	40	256 qam	30
21	379000000	2.7	40	256 qam	31
22	387000000	2.7	40	256 qam	32
23	395000000	2.7	40	256 qam	33
24	403000000	2.5	40	256 qam	34

Downstream bonded channels

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

1	Locked	40.3	3132	6509
2	Locked	40.3	3000	6761
3	Locked	38.9	4546	6780
4	Locked	40.3	1285	6871
5	Locked	40.3	962	7005
6	Locked	40.9	59999588	7979
7	Locked	40.9	1198	6699
8	Locked	40.3	1077	7002
9	Locked	40.3	1104	6998
10	Locked	40.3	1759	7081
11	Locked	38.9	1134	328
12	Locked	40.3	806	295
13	Locked	40.3	691	325
14	Locked	40.3	488	337
15	Locked	40.3	436	328
16	Locked	40.3	588	309
17	Locked	40.3	2258	329
18	Locked	40.3	1320	1857
19	Locked	40.3	1055	2001
20	Locked	40.3	1619	329
21	Locked	40.3	1085	7090
22	Locked	40.9	598	5843
23	Locked	40.9	593	6334
24	Locked	40.3	3151	1965