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Author Topic: HG612 sync  (Read 665 times)

airmark

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HG612 sync
« on: January 16, 2021, 04:26:07 PM »

Hi,
I am on BT infinity 1 and until now I have been using a Home Hub 6. I got a HG612 modem in order to be able to use a different router.
Thanks to the instructions on this site I unlocked it and installed the latest firmware, and now I plugged it in and connected it to an Asus RT-AC66U router, and after everything turned on I am getting slightly slower speed.
The HH6 was syncing at 55Mbps, quite stably (connection was reset less often than once a week), and I was having speedtest of around 52-53Mb download and 10Mb upload.
The HG612 synced at slightly lower speed, and my speedtest is 50Mb download and just under 9Mb upload.
It's nothing alarming I guess, but I would like to have the full speed I was getting with the HH6, so I was wondering if there any settings I can try.
Here are the line stats from telnet connection to the modem:

# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:   0
Max:    Upstream rate = 12518 Kbps, Downstream rate = 51324 Kbps
Bearer: 0, Upstream rate = 9997 Kbps, Downstream rate = 53722 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2800,3967)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2800,3967)
                  VDSL Port Details               Upstream                Downstream
Attainable Net Data Rate:           12518 kbps              51324 kbps
Actual Aggregate Tx Power:             7.5 dBm               13.4 dBm
====================================================================================
        VDSL Band Status                U0              U1              U2              U3              U4
D1              D2              D3
  Line Attenuation(dB):  4.8     26.7    40.5     N/A     N/A    13.8    34.8    53.8
Signal Attenuation(dB):  4.8     26.1    39.7     N/A     N/A    19.5    34.5    53.8
                SNR Margin(dB):  6.5     7.0     7.0      N/A     N/A    5.8     5.6     6.1
                 TX Power(dBm):  0.1    -16.5    6.6      N/A     N/A    10.5    7.8     6.8
#

Any suggestions welcome. Thanks!
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burakkucat

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Re: HG612 sync
« Reply #1 on: January 16, 2021, 05:37:36 PM »

Welcome to the kitz forum.

I am on BT infinity 1 and until now I have been using a Home Hub 6. I got a HG612 modem in order to be able to use a different router.
Thanks to the instructions on this site I unlocked it and installed the latest firmware, and now I plugged it in and connected it to an Asus RT-AC66U router, and after everything turned on I am getting slightly slower speed.

<snip>

Any suggestions welcome. Thanks!

For now, follow the simplest rule and do not disconnect the modem nor force it to retrain (resynchronise) for, say, at least a week. It is best not to invoke the wrath of the DLM process.

Other members, who routinely analyse xDSL line performances, will -- I'm sure -- ask for sight of more detailed statistics. From the command line, the output produced by the following, may prove useful --

Code: [Select]
xdslcmd info --stats
xdslcmd info --pbParams
xdslcmd info --vendor
xdslcmd info --vectoring
xdslcmd profile --show
xdslcmd --version

Do you know whether your line terminates on a Huawei or an ECI DSLAM? (The electronic gubbins in the "fibre cabinet".)
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airmark

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Re: HG612 sync
« Reply #2 on: January 16, 2021, 08:39:05 PM »

Thanks,
I had already turned off and on once before your reply, with no change in speed, so I will leave it on for now.
As far as I could tell from online search the cabinet is Huawei (without actually walking out and seeing the actual cabinet), which is why I got the Huawei modem.
Btw, there's a difference in the ping as well (used to be 5-6ms, now it's 7-8). I do wonder if it has to do with the router, or the fact that there are two separate boxes.

Here are the full stats:
# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:   0
Max:    Upstream rate = 12376 Kbps, Downstream rate = 51432 Kbps
Bearer: 0, Upstream rate = 9997 Kbps, Downstream rate = 52495 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):        6.2             7.0
Attn(dB):        19.0            0.0
Pwr(dBm):        13.3            7.5
                        VDSL2 framing
                        Bearer 0
MSGc:           -6              43
B:              235             31
M:              1               1
T:              0               64
R:              12              2
S:              0.1431          0.1017
L:              13867           2675
D:              8               1
I:              248             34
N:              248             34
Q:              8               0
V:              1               0
RxQueue:                44              0
TxQueue:                11              0
G.INP Framing:          18              0
G.INP lookback:         11              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               53314
OHFErr:         0               1
RS:             16876424                2406476
RSCorr:         25              1
RSUnCorr:       0               0
                        Bearer 1
OHF:            37789           0
OHFErr:         0               0
RS:             301821          0
RSCorr:         0               0
RSUnCorr:       0               0

                        Retransmit Counters
rtx_tx:         21242241                0
rtx_c:          1               0
rtx_uc:         0               0

                        G.INP Counters
LEFTRS:         0               0
minEFTR:        52489           0
errFreeBits:    485765          0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    61248229                0
Data Cells:     3267089         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               1
SES:            0               0
UAS:            27              27
AS:             607

                        Bearer 0
INP:            49.00           0.00
INPRein:        0.00            0.00
delay:          0               0
PER:            0.00            11.43
OR:             0.01            34.28
AgR:            52578.67        10031.40

                        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:        38/38           20/20

Total time = 10 min 34 sec
FEC:            25              1
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            27              27
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 10 min 34 sec
FEC:            25              1
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            27              27
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 15 minutes 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
Latest 1 day time = 10 min 34 sec
FEC:            25              1
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            27              27
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 = 10 min 7 sec
FEC:            25              1
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:   0
Max:    Upstream rate = 12376 Kbps, Downstream rate = 51432 Kbps
Bearer: 0, Upstream rate = 9997 Kbps, Downstream rate = 52495 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2800,3967)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2800,3967)
                  VDSL Port Details               Upstream                Downstream
Attainable Net Data Rate:           12376 kbps              51432 kbps
Actual Aggregate Tx Power:             7.5 dBm               13.3 dBm
====================================================================================
        VDSL Band Status                U0              U1              U2              U3              U4
D1              D2              D3
  Line Attenuation(dB):  4.8     26.7    40.5     N/A     N/A    13.8    34.8    53.8
Signal Attenuation(dB):  4.8     25.9    39.7     N/A     N/A    19.5    34.6    53.9
                SNR Margin(dB):  6.9     6.9     7.0      N/A     N/A    6.3     6.2     6.2
                 TX Power(dBm):  0.1    -16.4    6.6      N/A     N/A    10.4    7.8     6.9
# xdslcmd info --vendor
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:   0
Max:    Upstream rate = 12376 Kbps, Downstream rate = 51432 Kbps
Bearer: 0, Upstream rate = 9997 Kbps, Downstream rate = 52495 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
ChipSet Vendor Id:      BDCM:0xc01c
ChipSet VersionNumber:  0xc01c
ChipSet SerialNumber:   eq nr port:00  oemid softwarerev
# xdslcmd info --vectoring
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:   0
Max:    Upstream rate = 12376 Kbps, Downstream rate = 51432 Kbps
Bearer: 0, Upstream rate = 9997 Kbps, Downstream rate = 52495 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Vectoring state: 5
VCE MAC Address: 0:0:0:0:0:0
Total error samples Ethernet pkts sent: 0
Total error samples Ethernet pkts discarded: 0
Total error samples statuses sent: 0
Total error samples statuses discarded: 0
# xdslcmd profile --show

Modulations:
        G.Dmt   Enabled
        G.lite  Disabled
        T1.413  Disabled
        ADSL2   Enabled
        AnnexL  Disabled
        ADSL2+  Enabled
        AnnexM  Disabled
        VDSL2   Enabled
VDSL2 profiles:
        8a      Enabled
        8b      Enabled
        8c      Enabled
        8d      Enabled
        12a     Enabled
        12b     Enabled
        17a     Enabled
        30a     Enabled
        US0     Enabled
Phone line pair:
        Inner pair
Capability:
        bitswap         On
        sra             On
        trellis         On
        sesdrop         Off
        CoMinMgn        Off
        24k             On
        phyReXmt(Us/Ds) Off/On
        TpsTc           AvPvAa
        monitorTone:    On
        dynamicD:       On
        dynamicF:       Off
        SOS:            On
        Training Margin(Q4 in dB):      -1(DEFAULT)
# xdslcmd --version
xdslcmd version 1.0
DSL PHY: AnnexA version - A2pv6C038m.d24j
******* Pass *********
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burakkucat

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Re: HG612 sync
« Reply #3 on: January 16, 2021, 09:57:23 PM »

Thank you. From the following, we can see that you are definitely connected via Huawei DSLAM --

# xdslcmd info --vendor
<snip>
ChipSet Vendor Id:      BDCM:0xc01c
<snip>

Knowing the above, I can now say that, assuming the connection remains stable, the DLM process will start the process of lowering the target SNRM in 1 dB steps. Currently the target SNRM is set to the default value of 6 dB. So the first positive intervention by the DLM process will be to try the circuit with the target SNRM set to 5 dB. If, in turn, that proves to be stable . . ., etc. The lowest possible value that the DLM process can try (and settle upon) is 3 dB.

This gradual lowering of the target SNRM will increase the synchronisation speed of the circuit and, thus, the throughput available to you.

I've taken a quick look at the rest of the data and, as far as I can see, there is nothing obviously untoward. Hopefully other members will also take a look and comment, if necessary.

So you just need to "play the waiting game". On final comment from me, for now, . . . You can disconnect or restart the router as often as you wish, for the DLM process only monitors the VDSL2 (ITU-T G.993.2) link between the VTU-C (the cabinet based DSLAM) and the VTU-R (the HG612 modem).
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airmark

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Re: HG612 sync
« Reply #4 on: January 18, 2021, 10:00:32 AM »

Thank you. So far however, 2 days later, I see no improvement.
I can wait more though, I understand it can take a week or so. Meanwhile though I would like to make sure that my configuration is correct. In the reported stats the modem says download of >50 and upload of 10, and it seems some of that is lost when I measure it. Previously the measured speed was much closer to the reported one by  BT HH6 (for example it was reporting 54/10 in the web gui and I was speed testing 52.5/9.7 or so). So the reported is not very different from before (and identical on the upload) but the actual is lower (unless the reported by the modem is not the equivalent that I was seeing in the HH6 GUI). Is it possible that there's something wrong with the settings?
What makes me suspicious is that my Synology NAS is complaining that I have two routers (see attachment). I did set the modem to bridge mode, but I wonder if it's more that is needed. And so is it possible that it's not configured correctly and that is responsible for both issues?
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burakkucat

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Re: HG612 sync
« Reply #5 on: January 18, 2021, 05:42:49 PM »

. . . Is it possible that there's something wrong with the HG612's settings?
What makes me suspicious is that my Synology NAS is complaining that I have two routers (see attachment). I did set the modem to bridge mode, but I wonder if it's more that is needed. And so is it possible that it's not configured correctly and that is responsible for both issues?

There is no need to configure anything in the HG612's settings once it has been unlocked. It's default state is as a bridging modem for VDSL2 (ITU-T G.993.2) circuits. So just revert it back to its default state by pressing and holding the Reset button for, say, 20 seconds.
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Alex Atkin UK

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Re: HG612 sync
« Reply #6 on: January 18, 2021, 11:45:19 PM »

There is no need to configure anything in the HG612's settings once it has been unlocked. It's default state is as a bridging modem for VDSL2 (ITU-T G.993.2) circuits. So just revert it back to its default state by pressing and holding the Reset button for, say, 20 seconds.

The one exception may be to disable QoS to gain 1Mbit of upload at the cost of potentially more buffer bloat.  Although a good router should be handling that anyway.
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tubaman

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Re: HG612 sync
« Reply #7 on: January 19, 2021, 08:01:23 AM »

I think the slightly slower speed you are seeing is down to no more than the difference between different xDSL devices on your line
No two lines are alike and what works brilliantly on one line may only be a very average performer on another.
The HG612 is quite old now but was popular because it could be easily unlocked and was both stable and achieved decent (not necessarily best) sync speeds on a large number of lines.
:) 
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airmark

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Re: HG612 sync
« Reply #8 on: January 19, 2021, 09:14:44 AM »

There is no need to configure anything in the HG612's settings once it has been unlocked. It's default state is as a bridging modem for VDSL2 (ITU-T G.993.2) circuits. So just revert it back to its default state by pressing and holding the Reset button for, say, 20 seconds.
I did that before I installed and unlocked it, and then left it alone. Are you saying I should do it again? As far as I can tell, it is in bridge mode now, and it's reporting 52/10 sync speed, but I'm not seeing that when I test from end devices.
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Re: HG612 sync
« Reply #9 on: January 19, 2021, 09:16:15 AM »

The one exception may be to disable QoS to gain 1Mbit of upload at the cost of potentially more buffer bloat.  Although a good router should be handling that anyway.
That would be on the router, right? BT HH6 also had QoS, but could it be that it was more efficient/faster than the Asus?
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Re: HG612 sync
« Reply #10 on: January 19, 2021, 09:23:05 AM »

I think the slightly slower speed you are seeing is down to no more than the difference between different xDSL devices on your line
No two lines are alike and what works brilliantly on one line may only be a very average performer on another.
The HG612 is quite old now but was popular because it could be easily unlocked and was both stable and achieved decent (not necessarily best) sync speeds on a large number of lines.
:)
In other words, in my line, the HH6 performs better than the HG612?
The thing is, the line is capable of higher speeds (I think at least 60/15), and it's capped at 52/10 by my broadband package (Infinity 1), so with either modem I should be able to achieve this speed and no less.
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bkehoe

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Re: HG612 sync
« Reply #11 on: January 19, 2021, 09:53:05 AM »

and it's capped at 52/10 by my broadband package (Infinity 1), so with either modem I should be able to achieve this speed and no less.

It's a pity you haven't posted the stats from the HH6 before you switched for comparison, but from the stats you've posted you're not hitting a package limit with the H612 and its syncing at ~52MBit with the standard 6dB target SNR. You say you're speed testing at 50MBit...this is very good for a 52MBit sync as the IP Profile of the line is always lower than the sync speed.

Most comparisons I've seen show the 612 syncs slightly slower than other broadcom based devices (e.g. Zyxel, the HH6/SH2) but like others have said is popular for other reasons especially stability on a wide variety of lines.

The HH6 was probably very likely a tad more sensitive and achieved closer to a 55MBit sync with your line conditions (but unlikely capable of very much more unless your H612 has issues). The only way your line is capable of more than ~55MBit is if DLM decided to lower the SNR below 6dB which could happen as you're on a Broadcom cabinet and the quality of the line is good enough to keep the errors low. The side effect of this will be a change to ReTx High and a slower IP Profile though (this is automatically the default setting when DLM uses SNR targets below 6dB - search the forums for a lot of threads on this). So if DLM does drop your target SNR to 5dB you'll prob hit 55MBit sync but your IP profile will be just under 50MBit meaning slower speed tests :o.
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burakkucat

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Re: HG612 sync
« Reply #12 on: January 19, 2021, 03:24:44 PM »

I did that before I installed and unlocked it, and then left it alone. Are you saying I should do it again?

In that case, no, don't do it again.
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Re: HG612 sync
« Reply #13 on: January 19, 2021, 08:22:15 PM »

It was the QoS on the modem! It was turned on even though it wasn't doing anything other than wasting 1Mb from the upload speed. So now upload went to 9.5 (download still just under 49 but that's less of an issue).
I checked the other settings just in case (see attachment). Are these ok?
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Re: HG612 sync
« Reply #14 on: January 19, 2021, 10:23:32 PM »

I checked the other settings just in case (see attachment). Are these ok?

As you have shown that screen, there is one other thing you can do . . . and that is to delete the redundant VLAN tagged 301.
  • Place the cursor on the line that begins with the connection name ptm1.301
  • Left-click on it and it should then be highlighted in the darker blue colour.
  • Place the cursor on the Remove tab and left-click on it.
  • Wait for the screen to refresh and then go down to the Submit button & left-click on it.
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