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Author Topic: BT Infinity 2 VDSL - loss of speed/IP Profile  (Read 3155 times)

colin79666

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Re: BT Infinity 2 VDSL - loss of speed/IP Profile
« Reply #30 on: January 29, 2018, 09:20:40 PM »

Thanks tiffy, useful details as always  :)

Both ZyXEL VMG1312-B10Ds had the issue. First one was on through the night, the second just for the final hour before I switched back to the HG612. They both came from an eBay job lot but one was like new in box so I'd be surprised if they are both duds. Perhaps I'm just unlucky that the combination of that specific router and my line aren't a good fit.

The current Downstream BRAS rate is: 67 Mbps
The current Upstream BRAS rate is: 20 Mbps

Sync is 61Mbps DS.
« Last Edit: January 29, 2018, 09:24:51 PM by colin79666 »
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tiffy

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Re: BT Infinity 2 VDSL - loss of speed/IP Profile
« Reply #31 on: January 30, 2018, 12:31:57 PM »

@colin79666

Yes, I find it hard to believe that both your ZyXEL 1312-B10D's are faulty, there was so much going on with manual re-synch's and modem swapping over a short period of time that it's very easy to compound any external or internal line issue that may or may not have existed at that time.
You can always try the 1312's on your line again at a later date under controlled conditions after everything stabilises and DLM has had a reasonable time to settle down.

From MDWS, your line is still looking OK, note that US SNRM has taken quite a substantial step down towards where it originally was and your US & DS ES rates are very low / zero.

Your DS BRAS IP profile is confusing me somewhat, I would expect this to be lower that your DS synch rate !
For example my line current state: (on a 40/10 provision)
DS BRAS IP profile = 38.67
DS Synch Rate = 40.00
Data Throughput Ratio = 38.67/40.00 X 100 =  96.67% (to expectation as currently on retx low profile)
I have never seen DS BRAS IP profile greater than DS synch rate on my line ?

Strangely enough (to me anyway) apply your line DS BRAS IP / Synch figures the other way around:
DS Synch / BRAS IP X 100, 61/67 X 100 = 91.04%  (to expectation for retx high profile)

I'am confused, perhaps we need input from some of the more knowledgable forum members on this ?
« Last Edit: January 30, 2018, 12:34:00 PM by tiffy »
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Plusnet 40/10 - DSLStats/RPi - ZyXEL VMG1312-B10A - Huawei Cab - MDWS (sadly gone 12/03/18)

colin79666

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Re: BT Infinity 2 VDSL - loss of speed/IP Profile
« Reply #32 on: June 24, 2018, 02:02:07 PM »

Bit of an update on this one.

Things continued along the same lines with uptime of around 2 months between resyncs until about 3 weeks ago when suddenly DLM kicked in overnight and the sync speeds jumped back up to what I had been experiencing for the first 5 or so years of VDSL. I've had one more resync overnight since then but otherwise stable. I did spot an OR engineer at the cabinet the day before this happened so perhaps a cross talker has been moved from next to my line.

I note that the downstream interleave depth is now 16 but is is staying synced despite the below target downstream 3db? SNR margin. Some CRC errors on upstream now and then but nothing flagged as a serious error.

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   1
Last initialization procedure status:   0
Max:   Upstream rate = 20638 Kbps, Downstream rate = 90148 Kbps
Bearer:   0, Upstream rate = 20000 Kbps, Downstream rate = 79999 Kbps
Bearer:   1, Upstream rate = 0 Kbps, Downstream rate = 0 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):    2.2       1.5
Attn(dB):   16.6       0.0
Pwr(dBm): 12.4       7.0

All this has been on the Huawei OR modem which I think I'll stick to given the issues I had previously with the ZyXEL (although I don't think the ZyXEL itself is faulty, just didn't suit my particular line conditions).
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j0hn

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Re: BT Infinity 2 VDSL - loss of speed/IP Profile
« Reply #33 on: June 24, 2018, 07:51:46 PM »

xdslcmd info --vectoring

might explain it? or could indeed be a big crosstalker.
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BT FTTC 55/10 ECI now Huawei cab
Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

colin79666

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Re: BT Infinity 2 VDSL - loss of speed/IP Profile
« Reply #34 on: June 24, 2018, 09:29:21 PM »

xdslcmd info --vectoring

might explain it? or could indeed be a big crosstalker.
Vectoring state 5 so I guess not configured.

QLN in DSLStats from today attached along with one from MyDSLWebStats in January for comparison.

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j0hn

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Re: BT Infinity 2 VDSL - loss of speed/IP Profile
« Reply #35 on: June 24, 2018, 09:46:33 PM »

You need to click on "change tone range" on DslStats and expand to show all the tones up to 4000.
At the moment you are cutting them off at tone 800.
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BT FTTC 55/10 ECI now Huawei cab
Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

colin79666

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Re: BT Infinity 2 VDSL - loss of speed/IP Profile
« Reply #36 on: June 24, 2018, 09:55:28 PM »

Here we go  :-[

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