Cable Forum - General T3 Timeouts?

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- - General : T3 Timeouts? (https://www.cableforum.uk/board/showthread.php?t=33710522)

Hi Cable Forum users,

I hope you can help.

I have noticed for quite some time that I keep getting t3 timeouts on my hub 3 and I would like to know what causes these as my power levels are within spec I believe. I don’t notice any problems with the connection at all and receive exactly what I pay for on the download and upload speed.

Thanks for looking at my post.

Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 387000000 3.7 40 256 qam 32
2 203000000 4.5 40 256 qam 9
3 211000000 4.5 40 256 qam 10
4 219000000 4.3 40 256 qam 11
5 227000000 4.3 40 256 qam 12
6 235000000 4.1 40 256 qam 13
7 243000000 4 40 256 qam 14
8 251000000 4 40 256 qam 15
9 259000000 4 40 256 qam 16
10 267000000 4 40 256 qam 17
11 275000000 4 40 256 qam 18
12 283000000 4.3 40 256 qam 19
13 291000000 4.1 40 256 qam 20
14 299000000 4.5 40 256 qam 21
15 307000000 4.5 40 256 qam 22
16 315000000 4.6 40 256 qam 23
17 323000000 4.8 40 256 qam 24
18 331000000 4.6 40 256 qam 25
19 339000000 4.5 40 256 qam 26
20 347000000 4.4 40 256 qam 27
21 355000000 4.3 40 256 qam 28
22 363000000 4.3 40 256 qam 29
23 371000000 4 40 256 qam 30
24 379000000 3.9 40 256 qam 31

Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 40.3 52 59
2 Locked 40.9 60 58
3 Locked 40.9 81 42
4 Locked 40.9 51 121
5 Locked 40.3 49 60
6 Locked 40.9 53 62
7 Locked 40.9 59 53
8 Locked 40.9 65 62
9 Locked 40.3 70 54
10 Locked 40.3 76 63
11 Locked 40.3 77 69
12 Locked 40.9 52 58
13 Locked 40.9 55 46
14 Locked 40.3 57 52
15 Locked 40.9 79 57
16 Locked 40.9 51 50
17 Locked 40.3 63 60
18 Locked 40.9 57 54
19 Locked 40.3 51 58
20 Locked 40.9 73 73
21 Locked 40.3 45 78
22 Locked 40.9 41 71
23 Locked 40.3 53 47
24 Locked 40.9 81 53

Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 39399991 45 5120 64 qam 4
2 46199983 45 5120 64 qam 3
3 53699996 45 5120 64 qam 2
4 60299998 45 5120 64 qam 1

Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 ATDMA 0 0 4 0
2 ATDMA 0 0 3 0
3 ATDMA 0 0 3 0
4 ATDMA 0 0 0 0

Re: T3 Timeouts?

It is an iffy one. I am all for if it ain't broken don't fix it but it is something you need to keep an eye on in case it gets worse. You shouldn't be getting those T3 timeouts on each upstream channel and you shouldn't be getting post rs errors on every downstream channel.

As it isn't urgent if I were you I post the same info you have posted here on the VM community forum and let the moderators take a look at it. I am pretty sure T3 timeouts are a networks issue so they might be able to fix it behind the scenes and if they need to send someone out to you they'll get back to you.

Re: T3 Timeouts?

If the post-RS errors are not attributable to the no-mans land during hub boot up then they could be due to the T3 events interrupting the data flow.

We haven't seen the network log so can't judge the succession of T3 events.

Re: T3 Timeouts?

Quote:

Originally Posted by General Maximus (Post 36100224)

Hi General Maximus,

Thanks for taking the time to read and respond to my post.

Apparently I have some major issues with my power issues, that’s what someone from the Forum Team at Virgin Media Community is saying but I thought they are within spec?

Thanks for looking at my post.

---------- Post added at 21:09 ---------- Previous post was at 21:07 ----------

Quote:

Originally Posted by Sephiroth (Post 36100914)

Hi Sephiroth,

Thanks for taking the time to read and respond to my post.

Apparently I have some major issues with my power issues, that’s what someone from the Forum Team at Virgin Media Community is saying but I thought they are within spec?

Thanks for looking at my post.

Re: T3 Timeouts?

Looking at your stats, though, at the time you had no power issues. Whether or not that's case now, I don't know.

Re: T3 Timeouts?

Quote:

Originally Posted by Sephiroth (Post 36102537)

Looking at your stats, though, at the time you had no power issues. Whether or not that's case now, I don't know.

Hi Sephiroth,

Thanks again for taking the time to read and respond to my post.

Here are my power levels, how do they look?

Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 387000000 4 40 256 qam 32
2 203000000 4.5 40 256 qam 9
3 211000000 4.5 40 256 qam 10
4 219000000 4.4 40 256 qam 11
5 227000000 4.4 40 256 qam 12
6 235000000 4.4 40 256 qam 13
7 243000000 4.1 40 256 qam 14
8 251000000 4 40 256 qam 15
9 259000000 4 40 256 qam 16
10 267000000 4 40 256 qam 17
11 275000000 4 40 256 qam 18
12 283000000 4.3 40 256 qam 19
13 291000000 4.1 40 256 qam 20
14 299000000 4.5 40 256 qam 21
15 307000000 4.6 40 256 qam 22
16 315000000 4.8 40 256 qam 23
17 323000000 4.9 40 256 qam 24
18 331000000 4.8 40 256 qam 25
19 339000000 4.5 40 256 qam 26
20 347000000 4.5 40 256 qam 27
21 355000000 4.3 40 256 qam 28
22 363000000 4.4 40 256 qam 29
23 371000000 4.3 40 256 qam 30
24 379000000 4 40 256 qam 31

Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 40.3 27 0
2 Locked 40.3 47 0
3 Locked 40.3 72 0
4 Locked 40.9 55 0
5 Locked 40.3 52 0
6 Locked 40.3 40 0
7 Locked 40.9 45 0
8 Locked 40.3 44 0
9 Locked 40.9 62 0
10 Locked 40.3 90 0
11 Locked 40.3 60 0
12 Locked 40.3 47 0
13 Locked 40.3 70 0
14 Locked 40.9 61 0
15 Locked 40.9 46 0
16 Locked 40.3 53 0
17 Locked 40.3 64 14
18 Locked 40.3 60 0
19 Locked 40.3 62 0
20 Locked 40.9 70 0
21 Locked 40.9 63 0
22 Locked 40.3 33 0
23 Locked 40.3 38 0
24 Locked 40.3 60 0

Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 39399964 45 5120 64 qam 4
2 46200012 45 5120 64 qam 3
3 53700019 45 5120 64 qam 2
4 60299998 45 5120 64 qam 1

Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 ATDMA 0 0 6 0
2 ATDMA 0 0 2 0
3 ATDMA 0 0 2 0
4 ATDMA 0 0 6 0

Thanks for looking at my post.

Re: T3 Timeouts?

Channel Channel Type T1 T2 T3 T4 Timeouts
1 US_TYPE_STDMA 0 0 18 0
2 US_TYPE_STDMA 0 0 5 0
3 US_TYPE_STDMA 0 0 4 0
4 US_TYPE_STDMA 0 0 7 0

Here's my upstream data. The T3s don't affect anything I do.

Your power levels are absolutely perfect.

Re: T3 Timeouts?

There isnt anything wrong with those stats other than the T3 timeouts. Yours look like heaven compared to mine atm.

Re: T3 Timeouts?

A little bit techy, but Ive found this page useful ;

https://pickmymodem.com/cable-modem-...w-to-fix-them/

Re: T3 Timeouts?

Quote:

Originally Posted by Paul (Post 36102566)

A little bit techy, but Ive found this page useful ;

https://pickmymodem.com/cable-modem-...w-to-fix-them/

The important thing to note about T3 events, is that the circuit will reset (a T4 event) if there are 16 successive T3 events with 200ms between them.

You could have loads of T3 events that are outside that timing envelop. The referenced article states

Quote:

... not all T3s will cause a reset if communication is restored within 10 T3 periods or 20 seconds. When T3 timeouts occur, but not enough occur in succession to trigger a reset, slow speeds are often a symptom as these timeouts slow down the TCP/IP handshakes necessary to maintain internet connections.

So, the thing for the user to note is whether or not slow speds are happening.

Re: T3 Timeouts?

Quote:

Originally Posted by Sephiroth (Post 36102551)

Hi Sephiroth,

Thanks again for taking the time to read and respond to my post and confirming my power levels are fine.

Apparently I still have some major issues with my power issues, that’s what the Virgin Media systems say when running a test on my connection?

They said if red power levels are showing that it’s noted as a major issue with the power levels, meaning a engineer is required to adjust them and this is what is causing the errors I am seeing.

How can these power levels below be in the red?

Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 387000000 3.5 40 256 qam 32
2 203000000 4.1 40 256 qam 9
3 211000000 4 40 256 qam 10
4 219000000 3.9 40 256 qam 11
5 227000000 4 40 256 qam 12
6 235000000 4 40 256 qam 13
7 243000000 3.7 40 256 qam 14
8 251000000 3.5 40 256 qam 15
9 259000000 3.5 40 256 qam 16
10 267000000 3.7 40 256 qam 17
11 275000000 3.5 40 256 qam 18
12 283000000 3.7 40 256 qam 19
13 291000000 3.7 40 256 qam 20
14 299000000 4.1 40 256 qam 21
15 307000000 4 40 256 qam 22
16 315000000 4.4 40 256 qam 23
17 323000000 4.5 40 256 qam 24
18 331000000 4.3 40 256 qam 25
19 339000000 4.3 40 256 qam 26
20 347000000 4 40 256 qam 27
21 355000000 3.7 40 256 qam 28
22 363000000 4 40 256 qam 29
23 371000000 3.9 40 256 qam 30
24 379000000 3.5 40 256 qam 31

Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 40.3 31 0
2 Locked 40.9 49 0
3 Locked 40.3 79 0
4 Locked 40.3 69 0
5 Locked 40.3 60 0
6 Locked 40.9 48 0
7 Locked 40.3 54 0
8 Locked 40.3 53 0
9 Locked 40.9 76 0
10 Locked 40.9 101 0
11 Locked 40.3 69 0
12 Locked 40.3 50 0
13 Locked 40.9 86 0
14 Locked 40.3 67 0
15 Locked 40.9 64 0
16 Locked 40.9 58 0
17 Locked 40.3 71 14
18 Locked 40.3 74 0
19 Locked 40.9 71 0
20 Locked 40.3 74 0
21 Locked 40.3 68 0
22 Locked 40.9 40 0
23 Locked 40.3 55 1
24 Locked 40.3 67 0

Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 39399964 45 5120 64 qam 4
2 46200012 45 5120 64 qam 3
3 53700019 45 5120 64 qam 2
4 60299998 45 5120 64 qam 1

Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 ATDMA 0 0 8 0
2 ATDMA 0 0 2 0
3 ATDMA 0 0 2 0
4 ATDMA 0 0 6 0

Thanks for looking at my post.

Re: T3 Timeouts?

What's your browsing and data download experience? It should be OK.

Your power levels are, as you suppose, perfect.

Re: T3 Timeouts?

I've had exactly the same issue as the OP for donkeys years, never had any issues downloading or browsing so I've just left it.

Re: T3 Timeouts?

Quote:

Originally Posted by chambohambo (Post 36102859)

How can these power levels below be in the red?.

they aren't, they are absolutely fine. I have never heard of power levels "being in the red" and it sounds like something dramatic they have made up for you to justify the T3 timeouts. If they are saying your power levels are that bad then when is the tech booked for and coming out to fix it? There isn't anything wrong.

Re: T3 Timeouts?

Quote:

Originally Posted by General Maximus (Post 36103224)

I have never heard of power levels "being in the red" and it sounds like something dramatic they have made up for you to justify the T3 timeouts..

The tool the agents use does highlight bad stuff in red. But as said above, the power levels here are fine. Maybe they were looking at the wrong device.

If your service is working fine, don't worry about it.