XGS1930-28 and XS1930-10 support for 2.5G SFP GPON modules

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malakudi
malakudi Posts: 39  Freshman Member
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I've searched the group but I found only some old messages about XG1250 or XGS1210.
I have a SFP GPON module which supports 2.5g on SFP. I also have XGS1930-28 and XS1930-10 but both only offer support for 1g/10g on SFP+ ports.

Is it possible to support 2.5g as well? GPON module is GPON-ONU-34-20BI from FS.
Zyxel also has a similar GPON module with 2.5g SFP support.

Is there a way to make it link at 2.5g speed? It now only works when I have set fixed speed at 1g. It doesn't work at auto or 10g.

Accepted Solution

  • Zyxel_Melen
    Zyxel_Melen Posts: 1,714  Zyxel Employee
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    Hi @malakudi,

    Your understanding of the situation is correct. The lack of HSGMII support in the XGS1930-28 and XS1930-10 switches is the primary reason for their incompatibility with 2.5G SFP GPON modules. This is a hardware limitation, and as such, it's beyond the scope of what can be achieved through firmware enhancements.

    Zyxel Melen

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  • Zyxel_Melen
    Zyxel_Melen Posts: 1,714  Zyxel Employee
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    Hi @malakudi,

    Thanks for asking. XGS1930-28 and XS1930-10 only support 1G & 10G on SFP+ ports. Therefore, using a 2.5G transceiver or GPON is not recommended. Additionally, we have listed our Zyxel transceivers on the switch datasheet which are well-tested. Please also note that we can’t guarantee the third-party transceiver or GPON will work well on our Switch.

    image.png

    XS1930 datasheet

    XGS1930 datasheet

    Zyxel Melen

  • malakudi
    malakudi Posts: 39  Freshman Member
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    edited December 2023
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    Competition (Ubiquity and Mikrotik among others) do support SFP at 2.5g with those GPON modules. Zyxel GPON SFP module (model is PMG3000-D20B) works with products from those companies, but not with Zyxel switches? I find this at least embarrassing for Zyxel, having own product not work with their other own products.
    Is this something that can be fixed with a firmware upgrade in the future? Or there is a hardware limitation and SFP+ ports cannot work at 2.5g on those switches?

    What is needed is support for HSGMII on the SFP ports, in order for those modules to work at 2.5g . Can this be supported?

  • Zyxel_Melen
    Zyxel_Melen Posts: 1,714  Zyxel Employee
    First Anniversary 10 Comments Friend Collector First Answer
    Answer ✓
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    Hi @malakudi,

    Your understanding of the situation is correct. The lack of HSGMII support in the XGS1930-28 and XS1930-10 switches is the primary reason for their incompatibility with 2.5G SFP GPON modules. This is a hardware limitation, and as such, it's beyond the scope of what can be achieved through firmware enhancements.

    Zyxel Melen

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