HI Nvidia engineers,
Our company is currently working on a project that involves using the Thor module. From the developer kit, we noticed that you are using a QSFP28 connector, which indicates it can support speeds up to 100GbE.
We would like to ask whether it is possible to use UPHY1 LANE4 and LANE5, each connected to a separate SFP28 connector, and have them simultaneously support 25GbE connections individually.
QSFP28 is supported up to 4x 25GbE = 100GbE total throughput. You could use an external ethernet switch or could try very short length 100G QSFP28 to 4x25G SFP28 breakout cable and see if that works for you. To operate at 25GbE AOC (Active Optical Cable) might be required.
However, based on the following discussion, it seems possible to support 25GbE?
Our application doesn’t require a devkit; instead, we’re planning to use a new board with a Thor module.
The question now becomes :
whether the MGBE C0 and C1 can independently support the 25GbE SPF28 connector?
That topic was different in that it needed QSF28 to 1x SFP28. SFP28 is not supported in SW and HW. You will need to test this out with necessary HW and SW adaptations yourself and see if QSFP28 to 2x SFP28 works for your use case as per response earlier above.
Hi sgursal,
I’ve gone through additional discussions on the forum and summarized the following information. Could you please help confirm if this is correct and provide answers?
Currently, the official statement only mentions support for QSFP28 solutions. If we want to use a 2x25GbE SFP28 solution, we would need to verify its functionality ourselves.
Nvidia software does not currently support 2x25GbE designs. Will there be support for this in the future?
I saw some discussions indicating that 25GbE still has certain issues. Do you have any further updates on this?
If there is a requirement for multiple LAN ports, is the currently confirmed design limited to 10GbE? Would I need an additional IC (such as the AQR113C) to enable this application?
Thank you.
QSFP28 is supported. Two options
4x 25GbE. All 4x MGBE lanes operating at 25GbE
4x 2.5/5/10GbE. Any combination of supported ethernet speeds up to 10GbE
You could use an ethernet switch to meet your other requirements like 1x, 2x, 3x, 4x SFP28 or connecting Ethernet (Copper) PHY devices.
Please refer to Jetson Thor Adaptation and Bring-Up — NVIDIA Jetson Linux Developer Guide
Hi Nvidia Engineers,
Our current project still requires the implementation of two 25G SFP28 interfaces.
I would like to ask whether the necessary control signals (for example: TX_FAULT, TX_DISABLE, RS0) can be implemented through GPIOs.
Additionally, do you have any design recommendations or reference schematics for a dual 25G SFP28 connection that you could share with us?