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[sof006]

As the title suggests, I was downloading something earlier and noticed it wasn't going over a certain speed and thought "Huh, odd" so when the download completed I logged into my Vigor modem to see my speed had dropped and running VDSL ST command it gave me back this

Code: [Select]

Type ? for command help
> vdsl st

  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 63074000 bps   US Actual Rate       : 20000000 bps
   DS Attainable Rate      : 72938744 bps   US Attainable Rate   : 22738145 bps
   DS Path Mode            :  Interleave    US Path Mode         :        Fast
   DS Interleave Depth     :      919       US Interleave Depth  :        1
   NE Current Attenuation  :       13 dB    Cur SNR Margin       :        6  dB
   DS actual PSD           :     2. 8 dB    US actual PSD        :     3. 1  dB
   NE CRC Count            :        0       FE CRC Count         :     1826
   NE ES Count             :        0       FE  ES Count         :     1752
   Xdsl Reset Times        :        0       Xdsl Link  Times     :        1
   ITU Version[0]          : fe004452       ITU Version[1]       : 41590000
   VDSL Firmware Version   : 07-07-09-05-01-07   [with Vectoring support]
   Power Management Mode   : DSL_G997_PMS_L0
   Test Mode               : DISABLE
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :       12 dB    Far SNR Margin       :        6  dB
   CO ITU Version[0]       : b5004946       CO ITU Version[1]    : 544eb206
   DSLAM CHIPSET VENDOR    : < IFTN >
> 
I don't recall when this used to say but I know my speed was above 70Mb

Also [with Vectoring support] - I don't ever recall seeing this either, has my line had vectoring applied to it? I am on an ECI exchange so i'd be surprised if this is the case.

I hope my interleaving goes down. If anyone can give any insight to this much appreciated

p.s. I did shortly before grabbing these line stats power off and on the modem just to verify it wasn't some weird bug in the firmware. Speed went from 62 to 63 (no difference).

p.s.s. Modem is a Vigor 2762

[burakkucat]

VDSL Firmware Version   : 07-07-09-05-01-07   [with Vectoring support]

I read the line as saying that the firmware version currently installed (07-07-09-05-01-07) has vectoring support built into it and not that vectoring support has been enabled on your circuit.

DSLAM CHIPSET VENDOR    : < IFTN >

The above is a clear indication that your line connects via a cabinet equipped with an ECI Hi-FOCuS Mini-Shelf M41 electronics.

[sof006]

I read the line as saying that the firmware version currently installed (07-07-09-05-01-07) has vectoring support built into it and not that vectoring support has been enabled on your circuit.

The above is a clear indication that your line connects via a cabinet equipped with an ECI Hi-FOCuS Mini-Shelf M41 electronics.

That would make more sense and is most likely the case, I did have a big doubt that I would have vectoring on my line but wishful thinking 

[sof006]

Code: [Select]

  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
                      Near End                 Far End  Note
 Trellis      :      1                1
 Bitswap      :      0                1
 ReTxEnable       :      0                0
 VirtualNoise     :      0                0
 20BitSupport     :      0                0
 LatencyPath      :      0                0
 LOS          :      0                0
 LOF          :      0                0
 LPR          :      0                0
 LOM          :      0                0
 SosSuccess       :      0                0
 NCD          :      0                0
 LCD          :      0                0
 FECS          :    334             12759 (seconds)
 ES           :      0             1753 (seconds)
 SES          :      0                0 (seconds)
 LOSS          :      0               27 (seconds)
 UAS          :     34              406 (seconds)
 HECError      :      0                0
 CRC          :      0             1827
 INP          :      0               15 (symbols)
 INTLVDelay       :      0              800 (1/100 ms)
 NFEC          :    255               85
 RFEC          :     16               16
 LSYMB          :   5410             19517
 INTLVBLOCK       :    255               85
 AELEM          :      0             ----
> 
I can't tell if this is bad or not? Its hard to decipher. It looks like i'm getting CRC errors but I can't tell if thats on near end or far end?

[Alex Atkin UK]

Not sure I've ever seen Interleaving enable in just one direction before.

[j0hn]

Not sure I've ever seen Interleaving enable in just one direction before.

Are you sure you aren't getting mixed up?

On the FTTC DLM it's almost always the downstream only. They are treated completely independently (there needs to be both high DS & US ES for Interleaving to be applied to both).

I can't remember the last time I saw the FTTC DLM activate Interleaving on the upstream.

Quick search of the forum and the last dozen or so Interleaving threads have it applied to the downstream only.

[Alex Atkin UK]

Ah, checking my logs it looks like I only had Interleaving on Digital Region which would explain it.

Code: [Select]

Down Up
SNR (dB): 30.7 16.1
Attn(dB): 0.0 0.0
Pwr(dBm): 10.7 -9.2
VDSL2 framing
Path 0
B: 111 106
M: 1 1
T: 32 45
R: 16 16
S: 0.0810 0.3090
L: 12648 3184
D: 397 100
I: 128 123
N: 128 123
Counters
Path 0
OHF: 237630601 1349741
OHFErr: 0 8
RS: 351945749 2284716
RSCorr: 9396 3392084452
RSUnCorr: 0 0

Path 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 715862461 0
Data Cells: 671135315 0
Drop Cells: 0
Bit Errors: 0 0

ES: 5 8
SES: 5 0
UAS: 56 56
AS: 618057

Path 0
INP: 2.00 2.00
PER: 2.59 10.43
delay: 8.00 8.00
OR: 98.81 36.81

Bitswap: 518 1285
Seems when I moved to Openreach I was straight on fastpath.

Code: [Select]

Max: Upstream rate = 32107 Kbps, Downstream rate = 91776 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79987 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): 9.4 12.8
Attn(dB): 14.2 0.0
Pwr(dBm): 13.8 3.2
VDSL2 framing
Bearer 0
MSGc: 18 150
B: 239 236
M: 1 1
T: 23 5
R: 0 16
S: 0.0955 0.3771
L: 20104 5410
D: 1 1
I: 240 255
N: 240 255
Counters
Bearer 0
OHF: 12458667 624963
OHFErr: 263 8
RS: 0 3810143
RSCorr: 0 77
RSUnCorr: 0 0

Bearer 0
HEC: 221 0
OCD: 3 0
LCD: 3 0
Total Cells: 3168032633 0
Data Cells: 248408744 0
Drop Cells: 0
Bit Errors: 0 0

ES: 92 8
SES: 10 0
UAS: 608152 608142
AS: 20606

Bearer 0
INP: 0.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 1.65 6.15
OR: 116.09 202.87
AgR: 80103.09 20203.27

Bitswap: 16132/16132 15/15
Was 2014 before DLM was introduced?

[sof006]

Not sure I've ever seen Interleaving enable in just one direction before.

I have had Zen run a line test and they can't see any observable faults, looks like it might have just been a blip somewhere. Heres hoping interleaving gets removed and my speed returns.

I remember seeing a page on the kitz homepage talking about how to figure out the speed impact made by looking at the interleave depth and doing a calculation to figure out the impact on the speed?

Also judging by my download speed being impacting I am assuming here that interleaving was applied to my downstream?

[Alex Atkin UK]

Also judging by my download speed being impacting I am assuming here that interleaving was applied to my downstream?

Yes you see that here:

Code: [Select]

   DS Path Mode            :  Interleave    US Path Mode         :        Fast
   DS Interleave Depth     :      919       US Interleave Depth  :        1

[sof006]

Yes you see that here:

Code: [Select]

   DS Path Mode            :  Interleave    US Path Mode         :        Fast
   DS Interleave Depth     :      919       US Interleave Depth  :        1

Ah yes I see, I find it hard to look at text like this (I blame dyslexia)

I never know but is that considered quite a bad interleave depth? I have seen people on this forum with much higher, but curious if there is something that is considered "bad".

[shadow4dog]

It is interesting to me that your line has done the same thing as mine at almost the same time!

Mine was running fast path and about 48 CRC errors per day. Then I get interleve applied which has taken the sync speed down below the ISP hand back speed. The sync speed has for about 4 years been in the "impacted range" but the ISP says that is completely normal and there is nothing they can do (pre covid)...

Best of luck in you returning to Fastpath in the next few days.

Thanks
Tim

[sof006]

It is interesting to me that your line has done the same thing as mine at almost the same time!

Mine was running fast path and about 48 CRC errors per day. Then I get interleve applied which has taken the sync speed down below the ISP hand back speed. The sync speed has for about 4 years been in the "impacted range" but the ISP says that is completely normal and there is nothing they can do (pre covid)...

Best of luck in you returning to Fastpath in the next few days.

Thanks
Tim

Here is hoping! 

Are you also on Zen?

[shadow4dog]

Yes, also on Zen and in the South East, UK near Brighton.

[sof006]

Yes, also on Zen and in the South East, UK near Brighton.

Interesting.... I am in Newcastle Upon Tyne, I wonder if perhaps Zen has had an issue somewhere on their network?

Or perhaps just a coincidence

[sof006]

UPDATE:

I have logged into my Zen account, I have been marked for a "Network migration" which was applied on the 18th of Jan this year? Its still showing in progress, I wonder if Zen have done a DLM reset on my line from perhaps swapping me over?