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Author Topic: Zyxel VMG3625-T50B chipset!  (Read 176 times)

mofa2020

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Zyxel VMG3625-T50B chipset!
« on: September 15, 2021, 12:06:53 AM »

My ISP decided to provide this router in the near future and I know that Zyxel mostly uses Broadcom chipset with various levels "A, B, C, etc..." but for VMG3625-t20A I saw here on a topic that it uses a mediatek chipset which disappointed me since Broadcom is way better in performance, so does anyone know the chipset brand in this model? or will it be a series like VGM3625 in general uses mediatek but -TxxX determines the modem capabilities and level of performance like ADSL / VDSL / VOIP, etc..?

Thank you  :)
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tubaman

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Re: Zyxel VMG3625-T50B chipset!
« Reply #1 on: September 15, 2021, 07:58:49 AM »

It is a Mediatek modem chip in that one unfortunately.
The modem's capabilities are denoted by the first letter of the model name - so a VMG series is VDSL (AMG = ADSL, XMG = G.Fast).
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BT FTTC 80/20 Huawei Cab - Zyxel VMG8924-B10A

meritez

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Re: Zyxel VMG3625-T50B chipset!
« Reply #2 on: September 15, 2021, 10:47:05 AM »

My ISP decided to provide this router in the near future and I know that Zyxel mostly uses Broadcom chipset with various levels "A, B, C, etc..." but for VMG3625-t20A I saw here on a topic that it uses a mediatek chipset which disappointed me since Broadcom is way better in performance, so does anyone know the chipset brand in this model? or will it be a series like VGM3625 in general uses mediatek but -TxxX determines the modem capabilities and level of performance like ADSL / VDSL / VOIP, etc..?

Thank you  :)

According to the notes I have, the VMG3625-T50B is the same as the VMG8623-T50 but missing the 2 fxs ports to plug phones into for voip: https://www.zyxel.com/uploads/vmg3625_t50b/VMG3625-T50B-EG_DS.pdf

will your ISP hand over the Supervisor password?

I have a Mediatek Zyxel VMG1312-T20B in service at present, it's performing like so on a 40/10 FTTC connection:

Code: [Select]
=============================================================================
    xDSLFwVersion:      FwVer:5.10.1.23_B_A60901 HwVer:T14.F7_0.0
       Line State:      Up
       Modulation:      ITU G.993.2(VDSL2)
       Annex Mode:      ANNEX_B
=============================================================================

TPSTC type: 64/65B PTM TC

near-end interleaved channel bit rate: 39997 kbps
near-end fast channel bit rate: 0 kbps
far-end interleaved channel bit rate: 0 kbps
far-end fast channel bit rate: 9994 kbps

near-end FEC error fast: 0
near-end FEC error interleaved: 18213542
near-end CRC error fast: 0
near-end CRC error interleaved: 58
near-end HEC error fast: 0
near-end HEC error interleaved: 0
far-end FEC error fast: 5
far-end FEC error interleaved: 0
far-end CRC error fast: 0
far-end CRC error interleaved: 0
far-end HEC error fast: 0
far-end HEC error interleaved: 0
DSL uptime :2 days,  1:21, 45 secs
DSL activetime :0 min, 19 secs

Downstream:
relative capacity occupation: 100%
noise margin downstream: 8.8 dB
output power upstream: 6.8 dbm
attenuation downstream: 13.4 dB

Upstream:
relative capacity occupation: 100%
noise margin upstream: 9.7 dB
output power downstream: 6.6 dbm
attenuation upstream: 0.1 dB

Bit table:
carrier load: number of bits per tone
tone   0- 31: 00 00 00 00 00 22 44 56 66 77 88 89 99 99 9a aa
tone  32- 63: 0d dd dd cd dd dd cd cd dd dd ed dd de ed ee ed
tone  64- 95: ed dd de ed dd ee de ee ed ed de dd ed dd dd dd
tone  96-127: de dd ed dd dd dd dc dd dd dd dd dd dd dd dd dd
tone 128-159: dd dd dd dd dd dd dd cd dd cd dc cd dd dd cd cd
tone 160-191: cc cc cc cc cc cc cb cc cc cb bc bb cc cc cc cc
tone 192-223: cc cc cc cc ba ba 66 9a ba a9 bb bb bb bb bb ba
tone 224-255: bb bb bb ab aa ba bb ba ba ba aa aa a8 97 44 78


Of course the issues on above are as follows, no indication of max sync, and the statistics are lacking.




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mofa2020

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Re: Zyxel VMG3625-T50B chipset!
« Reply #3 on: September 15, 2021, 11:16:43 AM »

It is a Mediatek modem chip in that one unfortunately.
The modem's capabilities are denoted by the first letter of the model name - so a VMG series is VDSL (AMG = ADSL, XMG = G.Fast).

Thank you tubaman for clarifying this, Guess I will give it a go at least for me to own a Zyxel router  ;)

According to the notes I have, the VMG3625-T50B is the same as the VMG8623-T50 but missing the 2 fxs ports to plug phones into for voip: https://www.zyxel.com/uploads/vmg3625_t50b/VMG3625-T50B-EG_DS.pdf

will your ISP hand over the Supervisor password?


Unfortunately I do not even dream that my ISP will do such thing I am sure there will be a ton of options and features locked up / removed, BUT I will dig it up and even take it apart and post the chip / board pictures  >:D

I have another router that uses Mediatek chip and everything is fine on the low speeds like 30 Mbps but when I subscribe to higher speeds like 70 or 100 Mbps things get worse and the amount of CRC are crazy, since it is Zyxel it could perform better than other Mediatek devices.

Thank you for sharing your line stats  :)
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mofa2020

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Re: Zyxel VMG3625-T50B chipset!
« Reply #4 on: September 15, 2021, 02:09:42 PM »

According to https://wikidevi.wi-cat.ru/MediaTek this model will probably has a EN7516 chipset with 2 cores @ 900MHz this is the only chipset which support profile 35b from mediatek (EcoNet) as my ISP planning to increase VDSL2 speeds.
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