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[stoneditch]

Hello all,

I'm with Sky (FTTC on Superfast) and I wanted to move away from their router (ER115 and SR203) as I have a Firewalla Gold and wanted to do more sophisticated routing. Now the FWG doesn't have an xDSL interface so I have a Huawei Echolife HG612, I also have a Draytek Vigor 166 modem.

Weirdly the Sky routers I have both report a DS speed of 51 and US of 7/8 Mbps. The BT modem syncs at 47 down and 7 up, as does the Draytek.

Is there anyway I can bump this up? I believe that I can change the SNR values but, unsure what to and anyway this would surely depend on the existing SNR, ATTN and PWR figures.

Anyone else tried to do this before?

Thank you

[skyeci]

Depends on your cab type. If I was on eci I would use the Vigor. I used to tweak the snr on the v130. I ran my ds snr at 3.4 over 12 momths with no issues plus it lifted the ds sync. I don't know if the v166 supports this. If you are on huawei cab then I would use the 612. Course if you are on huawei then the modem can benefit from g.inp and lower snr which the eci cab won't have.

[stoneditch]

Hi skyeci

I can confirm that I am on a Huawei Cabinet, as confirmed by xdslcmd info --vendor. So, as I'm currently using the Echolife HG612 I'll stick with that. So now my question is what are the correct commands to change the SNR figures. I assume that it's xdslcmd something. I just don't want to screw it up, of course I can always do a long reset on the back of the modem.

Thanks

[g3uiss]

You can’t change the SNR. I would suggest you post some stats to give others here info to comment further

[stoneditch]

Hi g3uiss

Ok, I asumed that I could because you can on the Draytek 166 modem.

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:   0
Max:    Upstream rate = 7807 Kbps, Downstream rate = 47872 Kbps
Bearer: 0, Upstream rate = 7807 Kbps, Downstream rate = 47787 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):        4.3             6.5
Attn(dB):        23.8            0.0
Pwr(dBm):        11.0            1.4
                        VDSL2 framing
                        Bearer 0
MSGc:           -6              26
B:              227             207
M:              1               1
T:              0               43
R:              10              8
S:              0.1517          0.8462
L:              12547           2042
D:              4               1
I:              238             108
N:              238             216
Q:              4               0
V:              0               0
RxQueue:                115             0
TxQueue:                23              0
G.INP Framing:          18              0
G.INP lookback:         23              0
RRC bits:               0               24
                        Bearer 1
MSGc:           122             -6
B:              0               0
M:              2               0
T:              2               0
R:              16              0
S:              8.0000          0.0000
L:              32              0
D:              1               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               801629
OHFErr:         0               30
RS:             631998256               2071657
RSCorr:         848729          26
RSUnCorr:       0               0
                        Bearer 1
OHF:            1498583         0
OHFErr:         0               0
RS:             11988171                0
RSCorr:         0               0
RSUnCorr:       0               0

                        Retransmit Counters
rtx_tx:         14405506                0
rtx_c:          1969            0
rtx_uc:         0               0

                        G.INP Counters
LEFTRS:         0               0
minEFTR:        47789           0
errFreeBits:    17547354                0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    2212034033              0
Data Cells:     473523136               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               29
SES:            0               0
UAS:            25              25
AS:             24069

                        Bearer 0
INP:            55.00           0.00
INPRein:        1.00            0.00
delay:          0               0
PER:            0.00            9.13
OR:             0.01            28.03
AgR:            47892.18        7834.87

                        Bearer 1
INP:            2.00            0.00
INPRein:        2.00            0.00
delay:          0               0
PER:            16.06           0.01
OR:             63.75           0.01
AgR:            63.75   0.01

Bitswap:        10791/10791             132/132

Total time = 6 hours 41 min 34 sec
FEC:            848729          26
CRC:            0               30
ES:             0               29
SES:            0               0
UAS:            25              25
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 11 min 34 sec
FEC:            11706           0
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            4047            0
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 6 hours 41 min 34 sec
FEC:            848729          26
CRC:            0               30
ES:             0               29
SES:            0               0
UAS:            25              25
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 0 sec
FEC:            0               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 6 hours 41 min 7 sec
FEC:            848729          26
CRC:            0               30
ES:             0               29
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
#

Thank you

[skyeci]

So your profile is already g.inp enabled and running a low ds snr profile. I would be inclined to try a different modem suitable for a huawei cab in modem mode . I found on my relatives line a zyxel vmg3925-b10b in modem mode gave the best line sync speed wise against a handful of modems I tried. I use to find the 612 was always syncing at a lower speed..of course I appreciate other lines/users/modems will have different experiences...

Re snr changing I was doing this on my eci line which was possible.

[j0hn]

Hi g3uiss

Ok, I asumed that I could because you can on the Draytek 166 modem.

Broadcom chipsets can't modify the downstream SNR target on VDSL, only ADSL*.
Lantiq (infineon/intel) chipsets (like the Draytek uses) can do this.

You're already on a 4dB target set by the DLM. The default is 6dB, the lowest the DLM can go is 3dB.
You can manually set lower than 3dB on the Draytek but the lower the SNR target then the higher the errors tend to be and instability can increase.

If you really wanted that little bit extra from a Broadcom chipset you could try capping the sync speed lower. This can trick the DLM in to thinking the line is more stable than it is and it may then lower the target SNR to 3dB. Removing the cap would then see the line sync a little higher.
1dB is probably worth (very roughly) 3Mb for your line.

[stoneditch]

Ok, so how do I "try capping the sync speed lower". I assume it's xdslcmd configure something
I have also ordered Zyxel VMG3925-B10B. Maybe that will sync a bit quicker. I'm approx 600m from the FTTC Cabinet so I'm not expecting miracles. FTTP is at least 3 years away :-(
Thanks

[underzone]

adsl configure --maxDataRate 50000 20000 100000
#where 50000 is the downstream cap value, 20000 is up, and 100000 is max? just leave alone at this value of 100000

SSH or telnet into your modem (or issue a custom command in DSLstats), paste the above, hit enter and it will resync.

https://forum.kitz.co.uk/index.php/topic,16427.0.html

[stoneditch]

Hi underzone,

So I can't do this by lowering the snr value? I have to do this by using the --maxDataRate command as you stated above.
Just tried this xdslcmd configure --maxDataRate 51000 8100 100000
Nothing happened, maybe I have to just leave it for a bit for the DSLAM to catchup?

These are the line sync rates I'm currently getting
Max:    Upstream rate = 7845 Kbps, Downstream rate = 47624 Kbps
Bearer: 0, Upstream rate = 7845 Kbps, Downstream rate = 47521 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps

Thanks

[mofa2020]

Hi underzone,

So I can't do this by lowering the snr value? I have to do this by using the --maxDataRate command as you stated above.
Just tried this xdslcmd configure --maxDataRate 51000 8100 100000
Nothing happened, maybe I have to just leave it for a bit for the DSLAM to catchup?

These are the line sync rates I'm currently getting
Max:    Upstream rate = 7845 Kbps, Downstream rate = 47624 Kbps
Bearer: 0, Upstream rate = 7845 Kbps, Downstream rate = 47521 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps

Thanks

Because the set maximum is already higher than the actual sync. speed so that is why nothing happened, the max sync. must be lower than 47xxx in your case to make a change.. for the specific suggested speed cap other kitzens would help more.

[underzone]

mofa2020 is correct, you need to pick appropriate vaules. If you sync at 47872 Kbps try:

adsl configure --maxDataRate 40000 20000 100000

[stoneditch]

Ok, I see. I was hoping to 'tempt' the sync rate higher than what I'm getting at the moment. My original issue was that the Sky routers that I have usually sync higher around 51 DS and 8.5 US but, I don't want to use those as I can't run them in a modem only or bridge mode.

Oh well. Thanks all