SFP Buddy

$50

Sfp Media Buddy is a 2.5g media coverter using a rtl8221b (realtek) chip to convert between SFP+ modules and rj45 and supports 100mbit,1g, and 2.5g speeds(according to rtl8221b datasheet)

The Media Buddy is controlled by a rp2040 microcontroller which is connected to the media converter and all non-serdes pins of the sfp socket as well as to the usb-c port. As such it can control almost all functions of the sfp stick including

• i2c commands
• power cycling the sfp stick
• toggling and viewing the status of pins such as rx_los
• and most importantly using any of those pins as RX or TX for uart

Through the usb-c interface it exposes 2 serial ports, one which is connected to the uart functionality and the other is a management console allowing you to

• view status of pins
• power cycle the sfp module
• send commands to the media converter
• change which pins (if any) are connected to the uart console
• status of media converter

It also supports usb-pd for powering sticks with higher wattage than usb can normally handle.

The SFP Media Buddy is an all-in-one package for both using and debugging the SFP onts designed with input from the 8311 discord server to provide all functions required for debugging SFP+ modules.

A usb power delivery wall wart or one that providers 1amp or more current is required to power the media buddy. Most computers USB ports will work for debugging purposes however macbooks will only provide 500ma so a powered dock is suggested

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