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Author Topic: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware  (Read 1137 times)

GigabitEthernet

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I have the X6 firmware from here: https://github.com/johnson442/custom-zyxel-firmware/releases. I have this because in the past I had issues with the modem resyncing at half speed, due to an incompatibility with vectoring (which I have on my line) and the modem.

Unfortunately the modem is resyncing at half speed still.

====================================================================================
    VDSL Training Status:   Showtime
                    Mode:   VDSL2 Annex B
            VDSL Profile:   Profile 17a
                G.Vector:   Enable
            Traffic Type:   PTM Mode
             Link Uptime:   0 day: 9 hours: 6 minutes
====================================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:      5.968 Mbps       18.645 Mbps
    Actual Net Data Rate:      5.941 Mbps       18.646 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        9.9 dB           26.9 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:      - 1.7 dBm          12.1 dBm
           Receive Power:      -22.2 dBm         -16.9 dBm
              Actual INP:        0.0 symbols      49.0 symbols
       Total Attenuation:        0.0 dB          24.4 dB
Attainable Net Data Rate:      5.978 Mbps       56.707 Mbps
====================================================================================
  VDSL Band Status        U0      U1      U2      U3      U4      D1      D2      D3
  Line Attenuation(dB):    9.6    40.5    62.0     N/A     N/A    19.2    49.0    85.9   
Signal Attenuation(dB):    9.6    39.9     N/A     N/A     N/A    27.6    48.6     N/A   
        SNR Margin(dB):    11.5    9.7     N/A     N/A     N/A    26.9    27.0     N/A   
         TX Power(dBm):   -12.7   -2.1     N/A     N/A     N/A    10.6    6.6     N/A   
====================================================================================

            VDSL Counters

           Downstream        Upstream
Since Link time = 6 min 43 sec
FEC:      3727      356
CRC:      0      15
ES:      0      11
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 15 minutes time = 6 min 9 sec
FEC:      5      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 15 minutes time = 15 min 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 = 7 hours 6 min 9 sec
FEC:      120      34
CRC:      0      15
ES:      0      11
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 1 day time = 24 hours 0 sec
FEC:      11111541      322
CRC:      1384      68
ES:      30      36
SES:      24      4
UAS:      166      151
LOS:      1      0
LOF:      0      0
LOM:      10      0
Total time = 1 days 7 hours 6 min 9 sec
FEC:      160232548      356
CRC:      4823      427
ES:      116      258
SES:      83      4
UAS:      730      668
LOS:      4      0
LOF:      4      0
LOM:      45      0
====================================================================================

                 
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burakkucat

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #1 on: September 21, 2020, 07:21:36 PM »

I wasn't aware that the ZyXEL VMG1312-B10A was vectoring capable. <Puzzled.>  :-\
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GigabitEthernet

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #2 on: September 21, 2020, 07:29:05 PM »

I wasn't aware that the ZyXEL VMG1312-B10A was vectoring capable. <Puzzled.>  :-\

Well what modem would you advise?

I understood with the X6 firmware it worked fine. But if not, I am happy to buy something else, I only need the modem.
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burakkucat

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #3 on: September 21, 2020, 07:47:26 PM »

I'm not sure what to suggest. Sorry.

Seeing the line "G.Vector:   Enable" in the data you included, above, resulted in some head-scratching. After a quick search on the ZyXEL website, the VMG1312-B10A page confirms that it is vectoring capable.

I've just learnt something.
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siofjofj

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #4 on: September 21, 2020, 08:38:20 PM »

I understood with the X6 firmware it worked fine.
Hard to say. I believe some people on this forum have had success with version x6, but the number that have tried it is tiny (1 or 2 tops) since vectoring is very rare. I remember reading a comment in another thread suggesting that a regression had occurred and that the older versions are better. There have certainly been a number of changes made regarding vectoring between various versions. These changes are listed as G.993.5 in this document https://www.cisco.com/web/software/282821780/140978/ReleaseNote_A2pv6F039x3.pdf for a subset of firmwares.

If you want to try an older version of the DSL firmware without having to rebuild the whole firmware image, the A2pv6F039o driver is in the official Zyxel AAJZ.6 build, and the A2pv6F039o1 driver is in the AAJZ.7 build. I would be inclined to test the A2pv6F039o version, since this is the version which passed Openreach MCT approval (perhaps they tested vectoring?). Other DSL firmware versions which have passed MCT testing are A2pv6F039f1, A2pv6F039r and A2pv6F039t but a custom firmware build would have to be made to test these. Also, Sky seem to like to stick with the A2pv6F039m1 version in their BCM63168 chipset equipped ER115 for some reason, so that could be another one to try.

Edit: Openreach do indeed test vectoring as part of the MCT tests. See p.27 of this https://www.openreach.co.uk/orpg/home/helpandsupport/sins/sins/downloads/SIN498v7p7.pdf. I'd therefore suggest it is well worth trying one of the approved firmwares.

Edit 2: This thread is well worth a read https://forum.kitz.co.uk/index.php/topic,22306.0.html.
 
« Last Edit: September 21, 2020, 09:20:14 PM by siofjofj »
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GigabitEthernet

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Sorry for the late reply.

I would really like to get the 1508 MTU working but I also need to use the earlier firmwares as reported in the link above. They seem to have no issues on my line.

Can anyone help with this?
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siofjofj

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Just to update this thread, I belatedly spotted GigabitEthernet's request for a custom firmware which has baby jumbo support together with an older DSL firmware, since neither the default A2pv6F039v or newer A2pv6F039x6 that johnson has builds of were working well with vectoring in this case, however an older official build with the A2pv6F039o1 was fine. I have johnson's brilliant build environment set up on my computer, so offered to build a version of the firmware that uses the A2pv6F039o1 firmware.

However, I thought it might be interesting to try a different firmware, since johnson remarked in this post https://forum.kitz.co.uk/index.php/topic,22306.msg381599.html#msg381599 that while A2pv6F039o1 solved the sync speed issues for him, it was less stable. Since kitz pointed out (https://forum.kitz.co.uk/index.php/topic,22306.msg381566.html#msg381566) that the Openreach MCT approval tests the modem's behaviour when vectoring is used, I created a list of all the approved DSL firmwares for the BCM63168 chipset based on the MCT list here https://freeola.com/support/openreach-approved-vdsl-modems-router-mct.html for various modems. This list is
  • A2pv6F039o1.d26a
  • A2pv6F039r.d26d
  • A2pv6F039r.d26e
  • A2pv6F039t.d26i
  • A2pv6F039t.d26k
  • A2pv6F039v2.d26m

The last one, A2pv6F039v2, caught my eye since it is the newest, is closest to the version in the official latest Zyxel release and also because it does not appear in the changelog seen here https://www.cisco.com/web/software/282821780/140978/ReleaseNote_A2pv6F039x3.pdf while A2pv6F039v and A2pv6F039w either side of it do. This led me to suspect that perhaps A2pv6F039v2 is a special release made for the Technicolor TG589vac V1/V2 and TG789vac V1/V2 in order for those modems to pass MCT (which they have done with this firmware), maybe having been modified to resolve the vectoring issues.

I therefore built a version of the VMG1312-B10A 1.00(AAJZ.17)C0 firmware which had johnson's baby jumbo frame patch using the A2pv6F039v2 firmware extracted from the image for a Technicolor TG789vac V2. GigabitEthernet has now tested it out and found that it is working well. If anyone else with vectoring is having difficulties with the halved sync speed issue, perhaps A2pv6F039v2 would be worth a go in your case too.
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GigabitEthernet

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Something interesting to add with @siofjofj's firmware.

With every firmware I've used previously on ZyXEL devices, after a resync I've always seen this odd thing with the SNRM.

It will start at around 2dB lower and then slowly rise up over a few minute period. It happened every time without fail, which made it hard to work out if my target was actually say 4dB or actually 6dB.

I can only conclude this must be something to do with vectoring.

I didn't get this happening on the HG612 - and with the new firmware it doesn't happen either.
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Weaver

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I wonder if it is a good alternative for ADSL, if it contains any other improvements?
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siofjofj

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I wonder if it is a good alternative for ADSL, if it contains any other improvements?
I can't find any publicly accessible changelogs for the A2pv6F039v2 firmware, so can't confirm definitively whether or not any changes related to ADSL were made between it and A2pv6F039v. The ADSL related items in the changelog we do have access to are: 'Fix US CRC's against Calix C7 ADSL2-24A in G.992.[35]' and 'Fix long training time in G.992.1 against AD72 DSLAM' for the A2pv6F039w firmware, and 'Improve kl0 estimate in G.992.[35]' for the A2pv6F039x1 firmware.

What I can say though, is that I have tried the A2pv6F039x6 and A2pv6F039v2 (mainly so that I could check that this firmware wasn't something weird that only worked on Technicolor modems before giving it to GigabitEthernet) firmwares on my VMG8924-B10A on my Sky ADSL2+ line, and noticed no difference for either of them.

I'm happy to build you a A2pv6F039v2 firmware with the stats server and baby jumbo frames (anything else?) Weaver if you want to try it out (subject to the proviso that I don't own a VMG1312-B10A so can't test it, so flashing it would be at your own risk), however I might not be able to upload it until my connection is fixed as thanks to the DLM I now only have 600kbps upload and it keeps disconnecting necessitating starting the upload again.
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Weaver

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #10 on: November 21, 2020, 09:30:43 PM »

Yes please if you wouldn’t mind.
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burakkucat

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #11 on: November 21, 2020, 09:35:33 PM »

Yes please if you wouldn’t mind.

You are in the fortunate situation that one device could be updated with the newly built firmware image whilst leaving the other three on the older image, as control.
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Weaver

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #12 on: November 21, 2020, 09:39:39 PM »

I wouldn’t do that. I have (literally) a dozen spares in stock, Janet tells me.
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siofjofj

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #13 on: November 21, 2020, 10:29:44 PM »

Yes please if you wouldn’t mind.
As requested, I've built a firmware based on the Zyxel VMG1312-B10A_1.00(AAJZ.17)C0 image but using the A2pv6F039v2 DSL firmware. I included all of johnson's patches (jumbo frames, multiple telnet sessions, stats server and custom commands) since I assume the firmware you currently use also includes all these features.

As it is completely untested since I don't have a VMG1312-B10A, I'd rather not post the download link publicly until you can verify that it at least doesn't brick your modem. Could I send it to you by PM instead (I'm currently blocked from doing this)?
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hacktrix2006

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Re: Zyxel VMG1312-B10A with vectoring resyncing at half speed, WITH X6 firmware
« Reply #14 on: November 22, 2020, 11:16:27 PM »

siofjofj I have a VMG1312-B10A, just flashed the 1312-B10A-17-jumbo-v2.bin file however noticed there is no stats on it aka no mongoose server. Not sure if thats ment to be though. However will test the current firmware to see if any issues occur wih the 1312-B10A-17-jumbo-v2.bin firmware.

It boots and connects to the internet which is a start.
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