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[xreyuk]

Hi Guys,

I've also posted this over at the TBB forums if you think you've seen this thread before

Hi Guys,

I currently have an 80/20 product with Plusnet, and am currently synced at 46/12. The estimates for my line were somewhere between 34-47 down and 7-11 up. I went for 80/20 instead of 40/10 because when I signed up a month and a half ago, Plusnet only offered unlimited usage on their 80/20 product. Plusnet are now offering 40/20 with unlimited usage for £5p/m cheaper than what I'm currently paying.

At present, my line is is synced at 46Mbps down, with interleaving enabled. Interleaving is set at 909, INP is set at 3, and delay is set 8. Max attainable is 49.6Mbps

It is synced at 12Mbps up, with no DLM intervention whatsoever, max attainable is 12Mbps.

Here are my current stats:

Code: [Select]

# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 11975 Kbps, Downstream rate = 50360 Kbps
Bearer: 0, Upstream rate = 12236 Kbps, Downstream rate = 46430 Kbps

Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 5.1 5.9
Attn(dB): 22.0 0.0
Pwr(dBm): 12.6 7.1
VDSL2 framing
Bearer 0
MSGc: 18 26
B: 51 237
M: 1 1
T: 64 51
R: 12 16
S: 0.0356 0.6184
L: 14368 3286
D: 909 1
I: 64 127
N: 64 254
Counters
Bearer 0
OHF: 199886672 591688
OHFErr: 6211 463
RS: 3926237003 841265
RSCorr: 1854920276 18100
RSUnCorr: 605531 0

Bearer 0
HEC: 134570 0
OCD: 5014 0
LCD: 5014 0
Total Cells: 2199549361 0
Data Cells: 701843907 0
Drop Cells: 0
Bit Errors: 0 0

ES: 545 615
SES: 51 0
UAS: 112 68
AS: 457650

Bearer 0
INP: 3.00 0.00
INPRein: 0.00 0.00
delay: 8 0
PER: 2.28 7.91
OR: 83.85 32.34
AgR: 46514.30 12268.10

Bitswap: 338261/338261 75853/75853

Code: [Select]

# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 11938 Kbps, Downstream rate = 50700 Kbps
Bearer: 0, Upstream rate = 12236 Kbps, Downstream rate = 46430 Kbps

Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2688)
DS: (33,859) (1216,1961) (2793,3405)
  VDSL Port Details   Upstream   Downstream
Attainable Net Data Rate:     11938 kbps     50700 kbps
Actual Aggregate Tx Power:        7.1 dBm      12.6 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
  Line Attenuation(dB): 6.9 35.4 53.3   N/A   N/A 16.8 43.4 67.5
Signal Attenuation(dB): 6.9 34.7 51.8   N/A   N/A 24.9 43.0 68.3
SNR Margin(dB): 5.8 5.9 5.8   N/A   N/A 5.1 5.2 5.2
TX Power(dBm): 0.3 -7.5 5.7   N/A   N/A 10.0 7.8 3.7
#

I use the internet mostly for browsing/email, downloading on usenet (mostly when I'm not in, set up via RSS), streaming to and from the house, and PS4 gaming (in order of most often).

My question is: Would I be better off reducing my speeds to 40Mbps and potentially having interleaving disabled (so better pings etc), or am I better off keeping the higher sync speeds for my usage? I'm happy to pay the extra £5pm if I keep a better level of performance (plus I got the introductory £9.99 for 6 months on my current deal anyway, so total difference over contract is £30)

I realise no one can say for certain whether reducing my speeds to 40Mbps will take away interleaving. I've asked Plusnet, and they've said that whilst chaining to the 40/20 product will not reset DLM, it will re-enter me into the initial training period, which will make DLM more active again.

P.S I'm planning to wait a month or so anyway to see if DLM clears up my current connection, as my connection was messed with a fair bit in the first few days.

[Black Sheep]

Interesting that they're offering the 40/20 product. OR must be selling it to PN as the 80/20 and PN capping it to 40 on the DS ?? No reason why they shouldn't if it suits EU's needs. 

[xreyuk]

Yeah

Nevermind, they've said that they still put you on the 80/20 product and cap you using their profile. Your sync speeds would remain as if you were on 80/20, so I would still have interleaving.

Interestingly, I've seen somewhere on this forum that you can use a command to limit your download sync speed. Is it possible to do this to reduce the interleaving, and possibly remove it?

[Black Sheep]

Way out of my league, your last question, but I'd also be interested to know if this is the case ??

[NewtronStar]

Interestingly, I've seen somewhere on this forum that you can use a command to limit your download sync speed. Is it possible to do this to reduce the interleaving, and possibly remove it?

The only problem buy doing that is your going to have to lose 15000 kbps of your 46430 kbps which will take you down to 31000 kbps as you DS is low with a SNR of 5.1 dB.

The the lower you sync the SNR will increase and the interleaving depth will decrease, so if you could get the DS SNR to stay at 6.5dB 24/7 then there is a chance the DLM could move you onto fastpath. 

[xreyuk]

Thanks NewtronStar.

Why would I have to lose 15,000Kbps? Can you only limit it to certain thresholds?

I was originally synced around 43Mbps, but it moved it me up the other day. When at 43Mbps, I was around a 6dB SNR margin.

[NewtronStar]

Thanks NewtronStar.

Why would I have to lose 15,000Kbps? Can you only limit it to certain thresholds?

I was originally synced around 43Mbps, but it moved it me up the other day. When at 43Mbps, I was around a 6dB SNR margin.

The 15000kbps is an estminate, well that's it you see your SNRM is changeing all the time and 6db is not enough, have you been monitoring your DS SNRM with the stats software to see if it fluctuates or dips below 6dB ?

So to get any chance of seeing the DLM change you onto fastpath I would go for a DS SNRM of 7.5dB and don't know how much sync speed you will have to forfeit to get to that point it's trial and error 

[Bald_Eagle1]

SNRM can't be adjusted by FTTC users, but apparently sync speed can be.


I have attempted both ways a few times & had no success, but I believe Les-70 & maybe Kitz have had success with lowering sync speeds.

BTOR usually set a minimum SNRM value of 6 dB for VDSL2 connections (apart from Chrysalis who has somehow managed to get it down to a sustained 3.9dB or 4dB).



If sync speeds are reduced, SNR & SNRM should increase, possibly to a level where errors are drastically reduced & with a bit of luck, DLM would see it as a vey stable connection & possibly reduce interleaving depth, maybe all the way to reinstating fastpath.

[xreyuk]

I'd be interested in trying myself after I've given it a little while.

I was going to see if DLM was going to adjust my line any further so was going to give it a month or so.

If it doesn't do anything, I might try lowering sync speed to see if I can force DLM into putting game back to fast path.

[kitz]

Confirmed that both Les and I have been able to reduce sync speeds on the zyxel.  The info how to do so is in the zyxel thread and afaik should also work with a huawei too.

Les does so routinely now on a billion to keep the dlm happy and no interleaving.  Though iirc he did get caught fairly recently when swapping over routers.

[Ixel]

Confirmed that both Les and I have been able to reduce sync speeds on the zyxel.  The info how to do so is in the zyxel thread and afaik should also work with a huawei too.

Les does so routinely now on a billion to keep the dlm happy and no interleaving.  Though iirc he did get caught fairly recently when swapping over routers.

I also did this a while ago, I remember someone on here doubting my results and ability to cap the sync speed. You can do this with the HG612 and the Fr!tzbox 7390, I can't comment on the Zyxel as I've not used one, but whatever other's experiences are basically. It's an effective way to get rid of interleaving, just beware that doing so I found myself stuck on a 60/20 sync for several months, despite no longer enforcing a cap for several weeks at one point. My guess is DLM got stuck in a banded state somehow.

HG612

Code: [Select]

xdslcmd configure --maxDataRate <downstreamKbps> <upstreamKbps> <totalKbps>
For example, xdslcmd configure --maxDataRate 62000 20000 82000 would achieve a sync cap of 62,000Kbps downstream and 20,000Kbps upstream. This only works on the most recent firmware version for the HG612 however.

[NewtronStar]

I also did this a while ago, I remember someone on here doubting my results and ability to cap

I wonder was that me  ?

Its all fine and dandy to do this but if you have a sync of 30000 kbps it's not worth it as DS speed becomes more important than fastpath, it's only for the guys who already have 60+ megs sync at there disposal that's the way I see it.

[xreyuk]

Thanks guys, I think I'll give this a go if DLM doesn't do anything else with my line.

How much do you think I'd have to reduce the speeds by based on my stats in the first post?

Am I talking a drop of say, 4 or 5Mbps, or a larger drop of say, 15Mbps? I wouldn't mind taking a small hit to get off an interleaved line, however, I don't want to take a big one.

[NewtronStar]

well lets see when had a sync of 46430 kbps you had a DS SNRM of 5.1dB then you had a retrain and you had a sync of 43000 kbps this gave you a DS SNRM of 6.0dB so you lost 3000 kbps and gained 0.9dB of SNRM, so if the maths is correct to get 7.5dB (to cover any SNRM fluctuations on your line) then you should set the sync at 38000 kbps 

And then the long wait to see if the DLM moves you onto fastpath, I am sure you won't see it in 14days or 28days it could take a few months 

[xreyuk]

Thanks mate

I'm probably going to give DLM another month or two on my line (it's had 3 weeks so far, 1.5-2 Weeks stable) to see if it removes my interleaving, but looking at the SNRM and error counts above, I doubt it will remove it?

The reason I'm looking at doing it is because by lowering package, I'll save £5 p/m, and £30 over the length of the contract, as I got the 6 months introductory at £9.99 offer. I'd only lose 3-8 Mbps of speed, and considering that most of my downloading is done when I'm not at the house or asleep (it's automatic via RSS feed) I would consider that real-time performance is more important to me for browsing and gaming. It's not like a 38Mbps sync would be slow either

It's going to be better for browsing/gaming having a sync speed of say 38Mbps, pings of 14ms & no interleaving rather than having 46Mbps sync and 22-24ms pings, with interleaving right? Or am I not likely to notice much of a difference?

Kitz & Ixel - by lowering your sync speed, did you aim for a set SNRM, and if so, what SNRM did you aim for? Would 6dB be enough, or would you suspect I have to higher?