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[gazaai]

Hi all,

I've not been active on here in a while, but just wanted to share my findings recently when I was hunting for a modem replacement for my Billion 8800NL.

Essentially I was looking for a cheap VDSL router that could support 1508 MTU / baby jumbo frames (RFC4638) in bridge mode, which the old Billion 8800NL could not support.

I picked up two routers on ebay-

• VMG1312-B10A - £16
• VMG3925-B10C - £10

The chipset in the VMG1312-B10A seems to be far superior than the VMG3925-B10C, as it has essentially 2mbps difference on both the up & down line rates.

VMG1312-B10A		VMG3925-B10C
VDSL Port Details       Upstream         Downstream                Line Rate:     18.006 Mbps       62.152 Mbps     Actual Net Data Rate:     17.973 Mbps       62.153 Mbps           Trellis Coding:         ON                ON               SNR Margin:        6.0 dB            3.3 dB             Actual Delay:          0 ms              0 ms           Transmit Power:        7.2 dBm          12.8 dBm            Receive Power:       -4.8 dBm          -5.0 dBm               Actual INP:        0.0 symbols      57.0 symbols        Total Attenuation:        0.0 dB          18.0 dB Attainable Net Data Rate:     17.973 Mbps       62.411 Mbps		VDSL Port Details       Upstream         Downstream                Line Rate:     15.448 Mbps       60.526 Mbps     Actual Net Data Rate:     15.416 Mbps       60.527 Mbps           Trellis Coding:         ON                ON               SNR Margin:        6.0 dB            3.1 dB             Actual Delay:          0 ms              0 ms           Transmit Power:        7.1 dBm          12.8 dBm            Receive Power:       -6.2 dBm          -4.8 dBm               Actual INP:        0.0 symbols      58.0 symbols        Total Attenuation:       13.3 dB           17.7 dB Attainable Net Data Rate:     15.416 Mbps       60.884 Mbps

For anyone else interested in adding 1508 MTU support to Zyxel routers. You can checkout these excellent GitHub repositories.
https://github.com/johnson442/custom-zyxel-firmware/releases
https://github.com/trejan/VMG3925-B10B

Thanks,
Gary

Edit: apologies, just realised I should have posted in Broadband Hardware

[tubaman]

The VMG1312-B10A has a front-end line filter which improves the sync rate on many lines. Both have the same 63168 chipset which is better than the 63138 in some later models. This is certainly true on my line where a BT Smart hub 2 with the 63138 syncs at about 37Mbps but my VMG1312-B10A manages nearly 44Mbps.

[dee.jay]

It's funny, lots of people had great success with the B10A. I found it to be worse than my Huaweii HG612's so I stuck with them for the entire 12 years I had VDSL.

[gazaai]

You would think as time goes on, the newer chipsets should be getting better but it's actually the opposite. I believe it was a 63168 in my Billion 8800NL and that was very similar speed to the VMG1312, just no way to get the 1508 MTU on it.
 
I might purchase a HG612 on eBay then and try it out, it has been a long time since I've used one of them. I think I read somewhere that has up to 1520 MTU out of the box which is great.

[LordSven]

I personally recommend the VMG3926-B10A, which has the noise filter and certainly been the best performer (so far) on my noisy Openreach VDSL line. See https://forum.kitz.co.uk/index.php/topic,24282.msg475226.html#msg475226.

[gazaai]

I personally recommend the VMG3926-B10A, which has the noise filter and certainly been the best performer (so far) on my noisy Openreach VDSL line. See https://forum.kitz.co.uk/index.php/topic,24282.msg475226.html#msg475226.

Interesting, I wonder how that would compare to the VMG1312-B10A probably very similar. It does seem to have a 63168D chipset compared to the 63168 on the 1312, not sure how much different they are.

[LordSven]

@gazaai. I suspect that you're right, albeit with the faster cpu on the 3926. I do have a 1312 but haven't used it on my line. The 3926 continues (for now) to maintain sync with at a ridiculously low SNRm, beyond what I would expect.