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-   -   General : 4 upstream channel bonding - post here (https://www.cableforum.uk/board/showthread.php?t=33705315)

roughbeast 10-06-2018 22:15
Re: 4 upstream channel bonding - post here
 
Quote:
Originally Posted by Sephiroth (Post 35950028)
There isn't really a magic upstream number. The way that DOCSIS works is that the upstream power level is never higher than is necessary for the CMTS and the Hub to communicate with each other as determined by the keep-alive traffic.


In Roughie's case, he is close to the cabinet and downstream power levels are therefore high (and upstream low). Although the lower frequency channels are knocking on 10 dBmv, the hot weather will decrease that as the metal expands. That said, it would do no harm to put an attenuator to the back of the hub - say 6 dB.
Earlier this year engineers pulled through a new street coax for me because of low power levels that were affecting HD TV. To be certain of good service they put an attenuator in. I'm not sure of the dB value.

Sephiroth 10-06-2018 22:22
Re: 4 upstream channel bonding - post here
 
It could do with further attenuation just to be sure of staying within bounds.

PaulH225 12-06-2018 09:17
Re: 4 upstream channel bonding - post here
 
SO16 - had an outage yesterday and it's come back on with 4 upstreams:

Upstream
US-1 US-2 US-3 US-4
Channel Type 2.0 2.0 2.0 2.0
Channel ID 40 41 39 38
Frequency (Hz) 25800000 53700000 32600000 39400000
Ranging Status Success Success Success Success
Modulation 64QAM 64QAM 64QAM 64QAM
Symbol Rate 5120000 5120000 5120000 5120000
(Sym/sec)
Mini-Slot Size 2 2 2 2
Power Level 45.50 46.25 45.75 46.25
(dBmV)
T1 Timeouts 0 0 0 0
T2 Timeouts 0 0 0 0
T3 Timeouts 1 0 0 0
T4 Timeouts 0 0 0 0

Superhub 2AC

Paul

SnoopZ 17-06-2018 23:01
Re: 4 upstream channel bonding - post here
 
Quote:
Originally Posted by SnoopZ (Post 35949608)
I am not on 4 yet but have just gone to 2 qam64s for the first time ever so maybe they're upto something here too.
It has now gone to 1x qam64 and 1x qam32.

rtho782 18-06-2018 09:58
Re: 4 upstream channel bonding - post here
 
I had an outage this morning and am now on 4xQAM64.

DS SNR is a bit low tho.

Quote:
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 323000000 1.5 37 256 qam 24
2 315000000 1.2 37 256 qam 23
3 307000000 1.2 37 256 qam 22
4 299000000 1.5 38 256 qam 21
5 291000000 0.9 38 256 qam 20
6 283000000 1 38 256 qam 19
7 275000000 0.7 38 256 qam 18
8 267000000 0.9 37 256 qam 17
9 259000000 0.9 37 256 qam 16
10 251000000 1 37 256 qam 15
11 243000000 0.7 37 256 qam 14
12 235000000 0.7 37 256 qam 13
13 227000000 1 37 256 qam 12
14 219000000 0.7 37 256 qam 11
15 211000000 0.7 37 256 qam 10
16 203000000 0.5 37 256 qam 9
17 195000000 0.9 37 256 qam 8
18 187000000 0.9 37 256 qam 7
19 179000000 1 37 256 qam 6
20 171000000 0.9 37 256 qam 5
21 163000000 0.7 37 256 qam 4
22 155000000 0.9 37 256 qam 3
23 147000000 0.9 37 256 qam 2
24 139000000 -0.4 36 256 qam 1


Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 37.6 0 0
2 Locked 37.6 5 0
3 Locked 38.6 5 0
4 Locked 38.6 9 0
5 Locked 38.9 0 0
6 Locked 38.9 4 0
7 Locked 37.6 2 0
8 Locked 37.6 5 0
9 Locked 37.6 0 0
10 Locked 37.6 5 0
11 Locked 37.6 5 0
12 Locked 37.6 1 0
13 Locked 37.3 6 0
14 Locked 37.6 0 0
15 Locked 37.3 6 0
16 Locked 37.6 0 0
17 Locked 37.6 5 0
18 Locked 37.6 6 0
19 Locked 37.3 5 0
20 Locked 37.6 4 0
21 Locked 37.6 2 0
22 Locked 37.6 6 0
23 Locked 37.6 7 0
24 Locked 36.3 2 0


Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 39400000 47 5120 64 qam 6
2 25800000 47 5120 64 qam 8
3 32600000 47 5120 64 qam 7
4 46200000 47 5120 64 qam 5


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

SnoopZ 18-06-2018 10:56
Re: 4 upstream channel bonding - post here
 
Quote:
Originally Posted by SnoopZ (Post 35950943)
It has now gone to 1x qam64 and 1x qam32.

Now back to 2x qam64.

I do have concern about my DS SNR as it is around 31-35 and i get alot of pre rs errors and a few post errors on the odd channel now and then, but it doesn't seem to affect my internet but i do have an issue where a few channels on TV i can't get or break up!

So for all the installers here what are my options for fixing the TV channels and bumping up my DS SNR if i am already on the top tap, got a new thicker cable and an HDU-200 installed?

roughbeast 19-06-2018 10:14
Re: 4 upstream channel bonding - post here
 
1 Attachment(s)
What's all this then? Suddenly I have a slot for information on time-outs. This wasn't there until 2 days ago. There was an overnight reboot of SH3 and an instant improvement in the TBB quality graph.

Software version : 9.1.116.608

Sephiroth 19-06-2018 10:28
Re: 4 upstream channel bonding - post here
 
It is one of the firmware improvements.

Synthetic 20-06-2018 11:30
Re: 4 upstream channel bonding - post here
 
It's the Intel cpu "fix" that appears to prioritise ICMP so graphs look better :)

adduxi 21-06-2018 12:58
Re: 4 upstream channel bonding - post here
 
Noticed some red on the TBB yesterday and I rebooted when I got home.
We are now on 4 x 16QAM upstreams. BT27 area.

cje85 21-06-2018 17:17
Re: 4 upstream channel bonding - post here
 
Quote:
Originally Posted by Synthetic (Post 35951215)
It's the Intel cpu "fix" that appears to prioritise ICMP so graphs look better :)

The original trial firmware (9.1.116BA3) from October 2017 was just a ICMP "fix" which hid the problem, but the newest versions (.603/.608) appear to do much more.

All the tests and research on the VM forum since .603 first appeared in April shows a real improvement. Long discusion from this page onwards: https://community.virginmedia.com/t5.../true/page/364

US users on the DSLreports forum (where details of the Intel Puma 6 bug first surfaced) are seeing substantial improvements too.

Synthetic 21-06-2018 20:04
Re: 4 upstream channel bonding - post here
 
Interesting, I'm on 9.1.116.608 with an uptime of over 8 days.. I was on the original trial so maybe I got this 'proper' firmware much sooner.

SirThomas 22-06-2018 20:20
Re: 4 upstream channel bonding - post here
 
1 Attachment(s)
Lost service at midnight the other evening for two hours.

...Then, as if by magic - (only two?) 64QAM upstreams when back online.

I guess there's been some serious upgrading as everyone in the borough was down for the duration - I was previously on 2 16QAM's

Tom

SirThomas 28-06-2018 11:52
Re: 4 upstream channel bonding - post here
 
1 Attachment(s)
And now we have four shiny 64QAM channels in Havant, to enjoy!

Looks like the base latency has dropped a little as well, which surprises me :)

Tom

Spoiler: 
- The spikes last night were due to heavy upload by myself!

SnoopZ 17-08-2018 11:22
Re: 4 upstream channel bonding - post here
 
Quote:
Originally Posted by SnoopZ (Post 35949608)
I am not on 4 yet but have just gone to 2 qam64s for the first time ever so maybe they're upto something here too.
Since yesterday i have now gone from 2xQAM64s to 4xQAM16s in CB24 area, this is the first time i have been on 4 upstreams.


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