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Author Topic: ASUS DSL-AC68U (VDSL modem/router)  (Read 266174 times)

Ixel

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #195 on: November 13, 2014, 01:02:21 AM »

It would seem via the TC Console I'm able to override the downstream DSLAM parameters. As most people are aware I'm presently stuck on 49/20, well as of a few minutes ago I'm now back on 80/20. I set the max data rate to 10000 (x8) = 80000Kbps and wala.



Code: [Select]
>tcapi get Info_Adsl lineState
up
>tcapi show Info_Adsl
outDiscards=78
inDiscards=4
outBytes=84605781
inBytes=343251590
outPkts=220260
inPkts=307165
fwVer= FwVer:5.5.1.125_B_A60901 HwVer:T14.F7_0.1

lineState=up
Opmode=ITU G.993.2(VDSL2)
SNRMarginDown=6.1 dB
AttenDown=10.2 dB
SNRMarginUp=9.7 dB
AttenUp=0.1 dB
DataRateDown=79999 kbps
DataRateUp=20000 kbps
WanListMode=1
FECDown=0
FECUp=2
CRCDown=8
CRCUp=0
HECDown=0
HECUp=0
ADSLUpTime=7 min, 26 secs
ADSLActiveTime=0 min, 19 secs
PowerDown=10.9 dbm
PowerUp=4.4 dbm
AttainUp=27616
AttainDown=95748
ShowtimeStart=19
TotalStart=38
ATURANSIRev=0
ATUCANSIRev=0
ATURANSIStd=0
ATUCANSIStd=0
InterleaveDepth=1
AdslStandard=VDSL2
AdslType=ANNEX_B
mtenStandard=G.dmt.bisplus (Annex L)

I wouldn't advise going beyond your package speed limit however, if you do wish to explore this. But it does appear to override the max sync rate on the downstream, so is useful in overriding the DLM banding. I suspect the INP and delay would also be overriden (earlier today I forced my connection to be interleaved with INP 2 and a max delay of 16ms).
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Chrysalis

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #196 on: November 13, 2014, 01:48:02 AM »

hahaha ooooookay, nice.
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simoncraddock

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #197 on: November 13, 2014, 09:16:46 AM »

That's so funny, wait till this news spreads!
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Ixel

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #198 on: November 13, 2014, 09:54:30 AM »

Well, the bad news is while the connection was stable overnight, the CRC's racked up by around 7-8am this morning. Seems I get more errors during daytime than I do at night. I've temporarily resorted to interleaving my connection at 49/20 (INP 3, delay 8ms).

Code: [Select]
>tcapi get Info_Adsl lineState;tcapi show Info_Adsl
up
outDiscards=244
inDiscards=8767
outBytes=430504426
inBytes=1141743620
outPkts=932369
inPkts=1186123
fwVer= FwVer:5.5.1.125_B_A60901 HwVer:T14.F7_0.1

lineState=up
Opmode=ITU G.993.2(VDSL2)
SNRMarginDown=12.1 dB
AttenDown=10.3 dB
SNRMarginUp=6.7 dB
AttenUp=0.1 dB
DataRateDown=48999 kbps
DataRateUp=19999 kbps
WanListMode=0
FECDown=8853
FECUp=321
CRCDown=0
CRCUp=0
HECDown=0
HECUp=0
ADSLUpTime=47 min, 28 secs
ADSLActiveTime=0 min, 18 secs
PowerDown=11.8 dbm
PowerUp=5.0 dbm
AttainUp=25394
AttainDown=110104
ShowtimeStart=18
TotalStart=154
ATURANSIRev=0
ATUCANSIRev=0
ATURANSIStd=0
ATUCANSIStd=0
InterleaveDepth=1517
AdslStandard=VDSL2
AdslType=ANNEX_B
mtenStandard=G.dmt.bisplus (Annex L)

I will gradually increase the sync rate and/or reduce the INP/delay every 24 hours according to how many ES and CRC's there are on the downstream.
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babis3g

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #199 on: November 15, 2014, 10:58:31 AM »

Got in my hands before 2 days ago this unit and i play with it

It gave me few errors around 600 with adsl connection & everything disable (only bit swap enable)
I have enable the VECTOR G 993.5 and i have 0 CRC errors (very few up) for nearly a day & the spectrum is working very good, it does recovers the missing tones well

I have latest beta ending with ...2139
(note my high snr is due to my profile)

Here my settings ... worth to try and for vdsl users ... it seems very stable ... because i have find a bug will not change the or reset the errors after changing the parameters at dsl settings ... when load 100% the changes from the small loading tab, give a manual reboot


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simoncraddock

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #200 on: November 15, 2014, 11:16:44 AM »

ADSL2 and VDSL are very different beasts and what might work fine on lower speeds can wreck VDSL connections.

I'm beginning to think there's a bug in the attainable rate calculations which is over rating a lines true capability thus in turn causing instability with the DSLAM. Every time I put the ASUS on-line DLM reduces my speed and increases Interleaving depth within 24hrs . Every time I put my ZyXel or BT gear on-line things start returning to normal.
« Last Edit: November 15, 2014, 11:20:10 AM by simoncraddock »
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Fritzbox 7490 l Plusnet FTTC

babis3g

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #201 on: November 15, 2014, 11:19:53 AM »

ADSL2 and VDSL are very different beasts and what might work fine on lower speeds can wreck VDSL connections.

I'm beginning to think there's a bug in the attainable rate calculations which is over rating a lines true capability thus in turn causing instability with the DSLAM. everything I put the ASUS on-line DLM reduces my speed and increases Interleaving depth. Every time I put my ZyXel or BT gear on-line things start returning to normal.
i know your point make sense, i will try to report it ... in mean time worth to try the vector g 993.5 ... i have test it with a draytek 2760 as well and that one has less errors and so the DLM does not kick ... i know many disagree with vector enable with vdsl does not make sense ... but give a go with vector enable ... nothing to lose
« Last Edit: November 15, 2014, 11:22:50 AM by babis3g »
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simoncraddock

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #202 on: November 15, 2014, 11:24:31 AM »

Vectoring isn't supported by BT FTTC, nether is SRA.
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Fritzbox 7490 l Plusnet FTTC

andy66

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #203 on: November 15, 2014, 11:43:56 AM »

Vectoring isn't supported by BT FTTC, nether is SRA.

That just means that it shouldn't help.  However the equipment is clearly buggy, and any configuration change may have unintended consequences unrelated to what it's meant to do - the unintended consequences may help.
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babis3g

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #204 on: November 15, 2014, 11:54:21 AM »

vectoring is not supported even with my adsl line but as said for a reason is more stable with less errors ... i have test & a draytek 2760 with my adsl line & the ac68u both enable with vector & are much less errors at both so it does not look is very buggy
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ShadyBloke

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #205 on: November 15, 2014, 05:17:25 PM »

Hi All,

First post. I'm also suffering with the DSL-AC68U, great on paper but a bit problematic atm. I'm on plusnet. Similar situation to that described - dropping links every 5 minutes.

I've just upgraded to the 1.0.1.9 firmware and the line has remained stable for 2 hours which is great. Going to leave it on for a day before changing any other settings. However i'm now getting 10-11 Mbits per a second down on a 40/15 subscription (I used to get 39/9 on my previous BT infinity 2 sub). Prior to upgrading the firmware I was getting 38Mbs down.

A couple of questions are:
1. CRC errors - are these the bottom two figures in the DSL log page? if so mine seem high (see attached) and may explain the low download speed i'm now getting.
2. The ASUS website has a FAQ on setting you optimum MTU. Based on the ping test it suggests mine should be 1484 not 1492 as set on my WAN settings. When I change this and click apply it stays as 1492 every time. Is this set automatically by the ISP/ link. If so should I be worried about changing it?
3. Is anyone else on plus net if so what are the generally accepted optimum settings at this point in time (I know there are still issues generally). I see suggestions for reducing CRC on BT Infinity, If no one is on plusnet, I may try some of the BT settings suggested recently and see how these work on the basis that its 'mostly' the same infrastructure.
4. The SNR quoted is around 6dB. Is this figure the 'SNR' or infact the 'SNR margin'. In my understanding 'SNR' is higher the better and 'SNR margin' should preferably be low (as long as your link is stable). Because if my actual SNR is at '6 dB' then I think I have a big issue...

Cheers,

Richard.
« Last Edit: November 15, 2014, 05:38:23 PM by ShadyBloke »
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Ixel

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #206 on: November 15, 2014, 05:45:04 PM »

Hi All,

First post. I'm also suffering with the DSL-AC68U, great on paper but a bit problematic atm. I'm on plusnet. Similar situation to that described - dropping links every 5 minutes.

I've just upgraded to the 1.0.1.9 firmware and the line has remained stable for 2 hours which is great. Going to leave it on for a day before changing any other settings. However i'm now getting 10-11 Mbits per a second down on a 40/15 subscription (I used to get 39/9 on my previous BT infinity 2 sub). Prior to upgrading the firmware I was getting 38Mbs down.

A couple of questions are:
1. CRC errors - are these the bottom two figures in the DSL log page? if so mine seem high (see attached) and may explain the low download speed i'm now getting.
2. The ASUS website has a FAQ on setting you optimum MTU. Based on the ping test it suggests mine should be 1484 not 1492 as set on my WAN settings. When I change this and click apply it stays as 1492 every time. Is this set automatically by the ISP/ link. If so should I be worried about changing it?
3. Is anyone else on plus net if so what are the generally accepted optimum settings at this point in time (I know there are still issues generally). I see suggestions for reducing CRC on BT Infinity, If no one is on plusnet, I may try some of the BT settings suggested recently and see how these work on the basis that its 'mostly' the same infrastructure.
4. The SNR quoted is around 6dB. Is this figure the 'SNR' or infact the 'SNR margin'. In my understanding 'SNR' is higher the better and 'SNR margin' should preferably be low (as long as your link is stable). Because if my actual SNR is at '6 dB' then I think I have a big issue...

Cheers,

Richard.

Someone with similar issues to me!

1) Yes, extremely high CRC errors for around 2 hours uptime. I've also found that my DSL-AC68U struggles on fastpath with an SNRM of around 6dB, so I've been forced to use TC Console to override the downstream DSLAM parameters and currently set an INP of 3 and a delay of 8ms (interleaved). Since then DLM has also decided to put it on anyway, but I'm overriding it regardless.

2) I can't confirm that, I use the default however.

3) I can't answer that as I'm on Zen Internet.

4) SNRM - the higher the better, yes. 6 dB is the target SNRM however I personally feel it should be at least 9 dB on fastpath and 6 dB on interleaved instead (depending on sync rate banding applied).
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babis3g

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #207 on: November 15, 2014, 08:33:26 PM »

Although the above pic settings works best for me suddenly after a day started to lower the snr down to 19-20 (26db by default due to my profile capped speed) and snr up from 18 db lower to 11
errors from 0 gone up to 9
the max down rates was varying anything from 11-13 mbps
At the moment for my line still works great (high snr profile) but my guess if i was with a lower snr target like you guys i would had issues
« Last Edit: November 15, 2014, 08:35:30 PM by babis3g »
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babis3g

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #208 on: November 16, 2014, 12:42:21 AM »

if you want to watch the snr & connection speed then the routerstats lite is working (but not upstream)

go to the routerstats setup page and set
router tab user defined
url  http://192.168.1.1/Main_AdslStatus_Content.asp
log in your user name & pass
define stats press the get page and find the snr down & speed
Highlight the SNR Down as the screenshot to unique box & <td> to adjacent box ... ( use the green arrow to add at the right)

scroll down & do the same with Data Rate Down

example with the snr target .. should work for all

« Last Edit: November 16, 2014, 12:45:18 AM by babis3g »
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Ixel

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Re: ASUS DSL-AC68U (VDSL modem/router)
« Reply #209 on: November 16, 2014, 09:17:01 AM »

Nice.

Well, since 3am this morning I'm now on the following settings and my ES/CRC is lower than it was by now (6 hours uptime at time of posting~), but it's still early days.

- Target SNRM 9.0 dB
- INP 3, Delay 8ms
- Max/min downstream sync rate 80Mbps/64Kbps
- Bitswapping disabled (RX & TX)
- Disabled DS3 due to high bitswapping history when observing from HG612
- DSL Settings: Changed RX AGC from 'Stable' to 'Disabled'

Points 1 and 4 seemed to make a difference, but it could just be a coincidence. I need to run it for more time to know for sure.

Code: [Select]
>wan vdsl2 show mgcnt;tcapi get Info_Adsl lineState;tcapi show Info_Adsl
near-end path0 fec:     40124946(132558252)
near-end path0 crc:     49(2403)
near-end fec sec:       23615(71263)
near-end err sec:       21(1164)
near-end ses sec:       0(31)
near-end los sec:       0(0)
near-end ua  sec:       0(246)
far-end path0 fec:      4195(57808)
far-end path0 crc:      0(1116)
far-end fec sec:        254(3000)
far-end err sec:        0(968)
far-end ses sec:        0(0)
far-end los sec:        0(189)
far-end ua  sec:        0(10915)
up
outDiscards=1
inDiscards=731
outBytes=1221675152
inBytes=2114564884
outPkts=5004115
inPkts=6654708
fwVer= FwVer:5.5.1.125_B_A60901 HwVer:T14.F7_0.1

lineState=up
Opmode=ITU G.993.2(VDSL2)
SNRMarginDown=8.8 dB
AttenDown=10.3 dB
SNRMarginUp=6.8 dB
AttenUp=0.1 dB
DataRateDown=51547 kbps
DataRateUp=19999 kbps
WanListMode=0
FECDown=40124941
FECUp=4195
CRCDown=49
CRCUp=0
HECDown=0
HECUp=0
ADSLUpTime= 7:02, 54 secs
ADSLActiveTime=0 min, 18 secs
PowerDown=11.2 dbm
PowerUp=4.1 dbm
AttainUp=26477
AttainDown=70288
ShowtimeStart=18
TotalStart=94
ATURANSIRev=0
ATUCANSIRev=0
ATURANSIStd=0
ATUCANSIStd=0
InterleaveDepth=3001
AdslStandard=VDSL2
AdslType=ANNEX_B
mtenStandard=G.dmt.bisplus (Annex L)
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