# SFP-10G-T to 1G Port connection on Ubiswitch / Puck Maxi?

**URL:** <https://forum.botblox.org/t/sfp-10g-t-to-1g-port-connection-on-ubiswitch-puck-maxi/531>\
**Category:** BotBlox Hardware\
**Tags:** ubiswitch, sfp-10g-t\
**Created:** [February 20, 2026, 7:31am UTC](https://forum.botblox.org/t/sfp-10g-t-to-1g-port-connection-on-ubiswitch-puck-maxi/531 "2026-02-20T07:31:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Alex](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@Alex](https://forum.botblox.org/u/Alex)\
**Post date:** [February 20, 2026, 7:31am UTC](https://forum.botblox.org/t/sfp-10g-t-to-1g-port-connection-on-ubiswitch-puck-maxi/531/1 "2026-02-20T07:31:55Z")

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Hi there,

I am trying to connect two Puck Maxi switches togheter. One side of the connection is via your SFP-10G-T module and the other side is directly on the 1G port of the other switch. They dont seem to establish a connection. The inidcator LED on the switch with the SFP+/RJ45 module briefly lights up red and goes permanently dark afterwards. I thought the module supports auto negotiation and will switch to 1G. I tried all three SFP+ ports.

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**Author:** ![josh\_elijah](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.botblox.org/josh_elijah/32/568_2.png) [@josh\_elijah](https://forum.botblox.org/u/josh_elijah)\
**Post date:** [February 20, 2026, 8:05am UTC](https://forum.botblox.org/t/sfp-10g-t-to-1g-port-connection-on-ubiswitch-puck-maxi/531/2 "2026-02-20T08:05:20Z")

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Set the SFP ports on the other Puck Maxi to 1G using the BloxOSLite software.

> [@Getting UbiSwitch ports working with a 1G SFP](https://forum.botblox.org/t/getting-ubiswitch-ports-working-with-a-1g-sfp/73/3):
>
> Further to the post by @botblox_support above, this feature is now available for UbiSwitch in software! No soldering SM1 bridge is required! Changing the PCS mode on ports 9 and 10 can be done using the BloxOsLite CLI. Steps: Ensure you have version 0.4.0 or above installed on your UbiSwitch. See [here](https://github.com/botblox/bloxoslite-releases/releases) for public releases and [here](https://botblox.notion.site/Upgrading-1160ca7860eb80a99b64c0bc843a9d3c) for documentation on updates over UART. Boot up UbiSwitch and then connect a 3.3V TTL UART-USB converter to open a serial console on your dev machine. Follow the ins…

Note: Puck Maxi contains and UbiSwitch inside.