RT-AC86U 384.16 Hi, I updated to the latest Merlin firmware this morning (about 9 am) and since doing so my NE CRC count has gone up to 326598 over 5 hours. ...

[Bully]

Is the Below WAN setup correct?

 

Attachments:

1. 

   WAN-setup-2020-04-26-173409.png
   

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[UK Sentinel]

Bully wrote:

Is the Below WAN setup correct?

I have just plugged in my HG612 running Howling Wolf’s firmware, so will have a proper look at mine in the morning when house is a little quieter (Only 1 Ethernet cable plugged into Router WAN port from Modem) but settings do look correct/workable

I was interested to see from your graphs the Inteleave depth was still high and I am sure @Mrk26 will be interested in how busy your bitswapp-ing actually is

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[Mrk26]

On mine bitswaps barely swapping, however I think I will need to stop this exercise even today, for some reason I’m getting bunch of CRCs what didn’t happened on vigor.

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[Bully]

In the WAN settings what does the port binding do?

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[Mrk26]

Allocating port to the socket, so wan to lan 1(socket )  and lan to lan2(socket), at least how I understand this, maybe worong.

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[Bully]

@Mrk26 – Did you see my last 2 posts on page 13, stats, FEC and bitswap graphs?

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[Mrk26]

Bully wrote:

Today’s stats

Something must be wrong there, you getting now much more FECs 567k and on top of that you getting a lot more CRC errors. I’m not sure if first suggestion from @Uk Sentinel about noise on the line is not correct. Also wonder if you not getting higher amount of CRCs and FECs because you line sync faster now. When line was banded these errors was under control (kind of), but snr was 8db now you are on standard 6db. There is actually option to put cap on the line to make it more stable. Let’s see how stats will looks like tomorrow.

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[Mrk26]

Bully wrote:

@Mrk26 – Did you see my last 2 posts on page 13, stats, FEC and bitswap graphs?

Yes, I see. When I compared to mime yours it’s like constantly swapping, mine was up to 8, usually 2-4 on scale plus some single spikes which line up with CRC errors (I had two bursts of CRC errors today). So looks like modem still working hard on your line. Did you setup QoS in asus router? Also could you post your QLN and Hlog graphs.

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[Mrk26]

@Bully

Could you please change scale in bitswap per tone graph, it doesn’t show all tones, just wonder on which one is the bigger bitswap.

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[Bully]

xdslcmd info –Hlog
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 6
Last initialization procedure status: 0
Max: Upstream rate = 12136 Kbps, Downstream rate = 49604 Kbps
Bearer: 0, Upstream rate = 12097 Kbps, Downstream rate = 39709 Kbps

Tone number Hlog
0 -96.0000
1 -96.0000
2 -96.0000
3 -96.0000
4 -96.0000
5 -96.0000
6 -96.2500
7 -96.2500
8 -10.3750
9 -10.3750
10 -10.3750
11 -10.3750
12 -10.3750
13 -10.3750
14 -10.3750
15 -10.3750
16 -5.3750
17 -5.3750
18 -5.3750
19 -5.3750
20 -5.3750
21 -5.3750
22 -5.3750
23 -5.3750
24 -5.0000
25 -5.0000
26 -5.0000
27 -5.0000
28 -5.0000
29 -5.0000
30 -5.0000
31 -5.0000
32 -96.0000
33 -96.2500
34 -96.2500
35 -96.2500
36 -96.2500
37 -96.2500
38 -96.2500
39 -96.2500
40 -6.6875
41 -6.6875
42 -6.6875
43 -6.6875
44 -6.6875
45 -6.6875
46 -6.6875
47 -6.6875
48 -6.3750
49 -6.3750
50 -6.3750
51 -6.3750
52 -6.3750
53 -6.3750
54 -6.3750
55 -6.3750
56 -6.3750
57 -6.3750
58 -6.3750
59 -6.3750
60 -6.3750
61 -6.3750
62 -6.3750
63 -6.3750
64 -6.6875
65 -6.6875
66 -6.6875
67 -6.6875
68 -6.6875
69 -6.6875
70 -6.6875
71 -6.6875
72 -7.1875
73 -7.1875
74 -7.1875
75 -7.1875
76 -7.1875
77 -7.1875
78 -7.1875
79 -7.1875
80 -7.6875
81 -7.6875
82 -7.6875
83 -7.6875
84 -7.6875
85 -7.6875
86 -7.6875
87 -7.6875
88 -8.0000
89 -8.0000
90 -8.0000
91 -8.0000
92 -8.0000
93 -8.0000
94 -8.0000
95 -8.0000
96 -8.1875
97 -8.1875
98 -8.1875
99 -8.1875
100 -8.1875

xdslcmd info –QLN
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 6
Last initialization procedure status: 0
Max: Upstream rate = 12136 Kbps, Downstream rate = 49604 Kbps
Bearer: 0, Upstream rate = 12097 Kbps, Downstream rate = 39709 Kbps

Tone number QLN
0 -160.0000
1 -160.0000
2 -160.0000
3 -160.0000
4 -160.0000
5 -160.0000
6 -160.0000
7 -160.0000
8 -121.0000
9 -121.0000
10 -121.0000
11 -121.0000
12 -121.0000
13 -121.0000
14 -121.0000
15 -121.0000
16 -120.0000
17 -120.0000
18 -120.0000
19 -120.0000
20 -120.0000
21 -120.0000
22 -120.0000
23 -120.0000
24 -118.5000
25 -118.5000
26 -118.5000
27 -118.5000
28 -118.5000
29 -118.5000
30 -118.5000
31 -118.5000
32 -118.5000
33 -123.1875
34 -115.7500
35 -116.1875
36 -116.7500
37 -116.6250
38 -118.3750
39 -117.7500
40 -118.5625
41 -118.3125
42 -118.2500
43 -119.2500
44 -118.8750
45 -119.6875
46 -119.5000
47 -120.1250
48 -120.6875
49 -120.5000
50 -120.5625
51 -120.3125
52 -120.8125
53 -121.1875
54 -121.0625
55 -121.6250
56 -121.4375
57 -121.0625
58 -122.3750
59 -121.4375
60 -122.0625
61 -121.3750
62 -122.6250
63 -122.3125
64 -122.0000
65 -122.5625
66 -122.8125
67 -122.5625
68 -122.6875
69 -122.2500
70 -122.1250
71 -122.5625
72 -123.4375
73 -123.1250
74 -123.0625
75 -123.4375
76 -123.5000
77 -122.8750
78 -124.3750
79 -123.9375
80 -123.6875
81 -124.0000
82 -124.4375
83 -124.3125
84 -124.3750
85 -124.4375
86 -124.4375
87 -124.3750
88 -125.5000
89 -124.9375
90 -125.1250
91 -124.0000
92 -124.0625
93 -125.5000
94 -124.7500
95 -125.2500
96 -124.8125
97 -125.8125
98 -125.0625
99 -125.2500
100 -125.0000

*EDIT* – QOS on my Asus is set to game mode.

Attachments:

1. 

   Bitswaps-per-tone-2-2020-04-26-172120.png
   

2. 

   Hlog-2020-04-26-223159.png
   

3. 

   QLN-log-2020-04-26-223117.png
   

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[Mrk26]

Hlog looks OK, maybe bit short “tail” at the end, but looking at Qln I will say that there is some issues, it’s quite spiky, and spikes usually indicates some kind of RFI or EMI noise, if its smooth bump then is crosstalk (good examples on green part).

On mine Qln looks very similar (shape way), but without these big spikes.

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[UK Sentinel]

The other option is to maybe consider disabling Bitswap in both directions as some do think CRC are made worse by having bitswap enabled ?

This was true for the DSL-AC68U but that did use a MediaTeK DSL chipset which was hyper sensitive etc

FYI – Bit swap could be seen as a first line of defence against brief burst type noise spikes.  Without bit swapping most lines would see a lot more errors and loss of syncs.   The tones where the most bit swap occurs should mirror the tones where SNR is lost from.  For example when I had the line fault which affected my U0 channel, thats where all my bitswap was happening, and none in the higher frequencies.  You can also use a bitloading graphs to see where noise has been problematic over say 24 hours

Issue is underlying line fault (or compatibility with IFTN tones) and/or noise (my view) not much @bully can do regarding old firmware on cards so we are just left with tweaking modem to get the best we can

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[Mrk26]

UK Sentinel wrote:

FYI – Bit swap could be seen as a first line of defence against brief burst type noise spikes. Without bit swapping most lines would see a lot more errors and loss of syncs. The tones where the most bit swap occurs should mirror the tones where SNR is lost from.

Agree on that, bitswap is needed. Speaking about modem tweaking, @Bully could try to cap his line, the only issue maybe that he won’t be able to remove cap, even on fastpath because as soon he remove it he will be banded again. And with higher snr he should be able to achieve better line stability, unless he will be able to get engineer to check his line.

@UkSentinel

Yesterday exercise wasn’t good idea, I had two bursts of CRC errors (one over 6k and one over 11k errors) today my line is interleaved on downstream (thanks God only on downstream). So looks like for me vigor is doing a very good job with FEC on downstream 😉. I swapped modems yesterday evening but obviously was too late, scored CRCs during the day judged on DLM decision.

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[UK Sentinel]

Mrk26 wrote:

Agree on that, bitswap is needed. Speaking about modem tweaking, @Bully could try to cap his line, the only issue maybe that he won’t be able to remove cap, even on fastpath because as soon he remove it he will be banded again. And with higher snr he should be able to achieve better line stability, unless he will be able to get engineer to check his line.

Higher SNR is good for stability, alas @Bully has always had issues with synch rates and 39Mb currently is a great improvement,

Mrk26 wrote:

@UkSentinel Yesterday exercise wasn’t good idea, I had two bursts of CRC errors (one over 6k and one over 11k errors) today my line is interleaved on downstream (thanks God only on downstream). So looks like for me vigor is doing a very good job with FEC on downstream 😉. I swapped modems yesterday evening but obviously was too late, scored CRCs during the day judged on DLM decision.

Vigor (Lantiq) are quality chipsets usually at the cost of slightly lower synch. I wonder what caused your CRC bursts ?

I wonder if : (from a stability/reliability perspective)

• Lantiq Modem chipsets work well on Broadcom exchanges/cabs
• Lantiq Modem chipsets work well on IFTN (ECI) exchanges/cabs
• Broadcom Modem chipsets work well on Broadcom exchanges/cabs
• Broadcom Modem chipsets work poorly on IFTN (ECI) exchanges/cabs

(how long is that piece of string) 

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[Mrk26]

<p style=”text-align: left;”>For me modem with lantiq chipset always sync faster than broadcom. I think that these CRC bursts may be result of overloaded network, can’t explain this any different, as this never happened before. About two weeks ago I have one day where modem working hard as I have 20k FEC errors, where in normal conditions is about 3k, since lock down 6k. Usually broadcom modem is not that bad on my line especially zyxel with built-in dsl filter… wish I could get FTTP 😔</p>

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