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[j0hn]

Those stats look odd.

Retx (G.INP) shown as enabled on upstream and downstream.

Interleave depth suggests otherwise.

Error counts look broken. Not even a single FEC.

If everyone else is showing 0 errors in every field then those are being incorrectly reported.

Can't trust anything you read in those stats.

Safe to say with 2 of you suffering a drop in SNRM target that the error counts are far from zero.

[onion]

Safe to say with 2 of you suffering a drop in SNRM target that the error counts are far from zero.

Yep - this isn't right for sure. Is anyone from Draytek on these forums? Dunno whether to switch back to the old modem.

[omegapoint]

Going though I've noticed two of the fields are showing different byte ordering, which might explain some of the stats weirdness of it is getting the endianness of some of the fields wrong

Code: [Select]

166 - CO ITU Version[0]       : 00b54442       CO ITU Version[1]    : 4d43a1a4
130 - CO ITU Version[0]       : b5004244       CO ITU Version[1]    : 434da4a1

I've reported to Draytek & pointed them at this thread.

[Newfie]

Those stats look odd.

Retx (G.INP) shown as enabled on upstream and downstream.

Interleave depth suggests otherwise.

Error counts look broken. Not even a single FEC.

If everyone else is showing 0 errors in every field then those are being incorrectly reported.

Can't trust anything you read in those stats.

Safe to say with 2 of you suffering a drop in SNRM target that the error counts are far from zero.

I’ve had 3 so far and yes we spotted 0 errors too and thought it can’t be right. I’m down 14mbps on download.
Yes I can solve issues using a SQM but I’m fairly sure there is something going on as a 3.5mb picture should not be hogging 11Mbps up went sent and causing packet loss.
It’s the same for my friend so we are stumped at the moment and just feel it’s like a early release router waiting for firmware fixes, oh the joy of WiFi 6 all over again lol.

[Newfie]

Going though I've noticed two of the fields are showing different byte ordering, which might explain some of the stats weirdness of it is getting the endianness of some of the fields wrong

Code: [Select]

166 - CO ITU Version[0]       : 00b54442       CO ITU Version[1]    : 4d43a1a4
130 - CO ITU Version[0]       : b5004244       CO ITU Version[1]    : 434da4a1

I've reported to Draytek & pointed them at this thread.

That’s great, thanks as I’m also in touch with them too but before I go back I want to see what they suggested with the MTU.
Switched back to my normal router and I’ll see what happens over the weekend.

[onion]

Has anyone on here successfully used the modem without speed implications or performance issues in the UK?
I'm down to 1492 MTU now and will hold my breath overnight. If it drops again this things coming out.

[hushcoden]

Has anyone on here successfully used the modem without speed implications or performance issues in the UK?
I'm down to 1492 MTU now and will hold my breath overnight. If it drops again this things coming out.

I decided to keep it as I want to test that with the G.fast line (it will go live hopefully in three weeks).

I noticed no difference with MTU=1500 (1508 bay jumbo) or 1492.

I'm sharing my stats:

Code: [Select]

DrayTek> vdsl status
  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 79996000 bps   US Actual Rate       : 20000000 bps
   DS Attainable Rate      : 80563990 bps   US Attainable Rate   : 29625626 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :        1       US Interleave Depth  :        1
   NE Current Attenuation  :       13 dB    Cur SNR Margin       :        6  dB
   DS actual PSD           :     1. 4 dB    US actual PSD        :     1. 4  dB
   NE CRC Count            :        0       FE CRC Count         :        0
   NE ES Count             :        0       FE  ES Count         :        0
   Xdsl Reset Times        :        0       Xdsl Link  Times     :        1
   ITU Version[0]          : fe004452       ITU Version[1]       : 41590000
   VDSL Firmware Version   : 12-3-2-3-0-5   [with Vectoring support]
   Power Management Mode   : DSL_G997_PMS_L0
   Test Mode               : DISABLE
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :        0 dB    Far SNR Margin       :       12  dB
   CO ITU Version[0]       : 00b54649       CO ITU Version[1]    : 4e5406b2
   DSLAM CHIPSET VENDOR    : < ----- >


[Oakserver]

Has anyone on here successfully used the modem without speed implications or performance issues in the UK?
I'm down to 1492 MTU now and will hold my breath overnight. If it drops again this things coming out.

I swapped out an MT992 with the 166 in the UK on BT network.

I am on the Fibre 100 g.fast product which gives me speeds of up to 160mbps downstream. Looking at the max achievable rate I could go up to around 210mbps if I had the Fibre 250 product.

The MT992 used to drop around once a day. Since installing the 166 I've not yet had a drop other than when I've manually rebooted. Much improved. DSL checker shows improved figures than with the MT992.

I do not seem to have any problems with packet loss whatsoever, with my MTU left at its default setting perhaps I'm just lucky?

[onion]

My line is getting absolutely destroyed by SNR margin increases. Up another db over night from 4 to 5 resulting in yet more speed loss. I'm going back to the old modem for now.

Code: [Select]

> vdsl status

  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 61063000 bps   US Actual Rate       : 19152000 bps
   DS Attainable Rate      : 64587240 bps   US Attainable Rate   : 19148000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :        8       US Interleave Depth  :        1
   NE Current Attenuation  :       17 dB    Cur SNR Margin       :        5  dB
   DS actual PSD           :    12. 8 dB    US actual PSD        :     7. 4  dB
   NE CRC Count            :        0       FE CRC Count         :        0
   NE ES Count             :        0       FE  ES Count         :        0
   Xdsl Reset Times        :        0       Xdsl Link  Times     :        2
   ITU Version[0]          : 00000000       ITU Version[1]       : 00000000
   VDSL Firmware Version   : 12-3-2-3-0-5   [with Vectoring support]
   Power Management Mode   : DSL_G997_PMS_L0
   Test Mode               : DISABLE
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :        0 dB    Far SNR Margin       :        5  dB
   CO ITU Version[0]       : 00b54442       CO ITU Version[1]    : 4d4390c1
   DSLAM CHIPSET VENDOR    : < ----- >
 
> vdsl status more

  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
                      Near End                 Far End  Note
 Trellis      :      0                1
 Bitswap      :      0                0
 ReTxEnable       :      1                1
 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          :      0                0 (seconds)
 ES           :      0                0 (seconds)
 SES          :      0                0 (seconds)
 LOSS          :      0                0 (seconds)
 UAS          :      0                0 (seconds)
 HECError      :      0                0
 CRC          :      0                0
 INP          :      0              235 (symbols)
 INTLVDelay       :    100                0 (1/100 ms)
 NFEC          :    254              244
 RFEC          :     14                8
 LSYMB          :   5096             16764
 INTLVBLOCK       :    127              244
 AELEM          :      0             ----
> 

Edit - old modem back in and clawed some speed back, still stuck at 5db SNR target obviously but hope that reverts to 3db as previous over the coming days. New stats below if anyones interested. These modems are definitely broken for non-G.fast connections.

Code: [Select]

/usr/sbin/xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 19058 Kbps, Downstream rate = 69496 Kbps
Bearer: 0, Upstream rate = 19058 Kbps, Downstream rate = 68833 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): 5.2 6.0
Attn(dB): 16.6 0.0
Pwr(dBm): 13.1 6.9

VDSL2 framing
Bearer 0
MSGc: -6 21
B: 243 239
M: 1 1
T: 0 64
R: 10 14
S: 0.1129 0.4007
L: 18002 5071
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 77 0
TxQueue: 11 0
G.INP Framing: 18 0
G.INP lookback: 11 0
RRC bits: 0 24
Bearer 1
MSGc: 154 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 6.4000 0.0000
L: 40 0
D: 3 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0

Counters
Bearer 0
OHF: 0 22007
OHFErr: 0 0
RS: 4941880 1408170
RSCorr: 17 0
RSUnCorr: 0 0
Bearer 1
OHF: 8777 0
OHFErr: 0 0
RS: 87159 0
RSCorr: 0 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 9038716 0
rtx_c: 0 0
rtx_uc: 0 0

G.INP Counters
LEFTRS: 0 0
minEFTR: 68822 0
errFreeBits: 148043 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 18664287 0
Data Cells: 1070036 0
Drop Cells: 0
Bit Errors: 0 0

Bearer 1
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 0 0
Data Cells: 0 0
Drop Cells: 0
Bit Errors: 0 0

ES: 0 0
SES: 0 0
UAS: 29 29
AS: 141

Bearer 0
INP: 58.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 6.43
OR: 0.01 33.55
AgR: 68903.88 19091.40

Bearer 1
INP: 4.50 0.00
INPRein: 4.50 0.00
delay: 3 0
PER: 16.06 0.01
OR: 79.68 0.01
AgR: 79.68 0.01

Bitswap: 51/51 2/2

Total time = 2 min 50 sec
FEC: 17 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 29 29
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0

[j0hn]

The MT992 used to drop around once a day. Since installing the 166 I've not yet had a drop other than when I've manually rebooted.

How can you even tell it's the MT992 dropping sync?

It has zero stats to show sync has dropped and resyncs only take a couple seconds.

[omegapoint]

My line stayed up overnight, SNR still 4 however I’ve reset the MTU to 1500 as started getting constant low level packet loss.

[onion]

My line stayed up overnight, SNR still 4 however I’ve reset the MTU to 1500 as started getting constant low level packet loss.

I run a lot of backups overnight which results in a good 3 hours of upload maxxed out, so i wonder if thats got anything to do with it. may be making it worse for me.
Do you know if the SNR stats on the draytek are showing the same for upload and download? on my old modem my upload has a different SNR to the download under g.inp, i wonder if the upload requires 6db to be stable and the download required 3db, but the draytek was forcing the same SNR for up and down, causing stability issues on the up, then dropping the SNR for both? (i dont know enough about networking if i'm honest!)

[omegapoint]

I run a lot of backups overnight which results in a good 3 hours of upload maxxed out, so i wonder if thats got anything to do with it. may be making it worse for me.
Do you know if the SNR stats on the draytek are showing the same for upload and download? on my old modem my upload has a different SNR to the download under g.inp, i wonder if the upload requires 6db to be stable and the download required 3db, but the draytek was forcing the same SNR for up and down, causing stability issues on the up, then dropping the SNR for both? (i dont know enough about networking if i'm honest!)

The UI shows the same up and down but the "vdsl status" command shows 4 down, 5 up. I trust the "vdsl status" value as that matches the 130's value and my upstream speed is the same

[Newfie]

How can you even tell it's the MT992 dropping sync?

It has zero stats to show sync has dropped and resyncs only take a couple seconds.

Hi are you U.K. based as I noticed Annex B was being used in your older modem stats?

[j0hn]

Hi are you U.K. based as I noticed Annex B was being used in your detailed stats?

I think you may have quoted the wrong person as I haven't posted any stats in this thread.

The UK uses Annex A infrastructure (POTS) with an Annex B bandplan on VDSL2.

The Draytek shows this nicely...

ATU-R Info (hw: annex A, f/w: annex A/B/C)

Hardware Annex A, firmware Annex B is used on VDSL2.

Broadcom modems report the bandplan Annex...

Mode:         VDSL2 Annex B