Pick your country and quantity, then pay with PayPal directly on this page. Once payment is received the board is shipped, usually the next working day, and you get a tracking number by email.

How much is shipping and handling?

Shipping is calculated automatically for your destination and always includes a tracking number. Orders ship from France with La Poste, or with Happy Post where La Poste no longer delivers; customs handling is included where the destination requires it, while any import duties billed on arrival remain payable by the buyer.

What else do I need to use the adapter?

A 3.3V USB-TTL adapter, 4 female-to-female Dupont cables, a USB cable, a compatible GPON SFP/ONU module (FS.com, Huawei MA5671A, etc.) and a serial console app such as screen, PuTTY or minicom.

My GPON module keeps rebooting — what is wrong?

It is usually a power-supply issue with your USB-TTL adapter. Version 1.1 relied entirely on the quality of your adapter; version 1.2 and later include two capacitors to help prevent this.

SFP-to-TTL v1.3 Adapter

SFP-to-TTL adapter (top & bottom)

Breaks out a GPON stick’s 20 pins so you can flash firmware using a serial adapter. No soldering required 👍

Order

💶 Price: 19.90€ + shipping
✈️ Ships almost worldwide
🧭 Always ships with tracking number.
🧑‍💻 Each board is manually tested before shipping

Description

The SFP-to-TTL v1.3 is a compact adapter that exposes the 20 pins of a GPON SFP module connector to make the 3V UART lines (TX, RX, VCC, GND) accessible. Perfect for:

flashing OpenWrt / Carlito / stock firmware
debugging the bootloader
grabbing serial logs without fiddly pogo-pins

Key features

Feature	Detail
Version	v1.3 (white)
Exposed pins	2x20 SFP connector pins (UART, I²C, GPIO, etc.)
Silkscreen	First pin of each row marked 1 and 11, following the SFP MSA pin numbering — the same numbering every pinout table and forum post uses — with VCC and GND called out
Quick start	QR code on the back of the board, marked GET STARTED: scan it for the step-by-step setup guide
SFP connector	SFP slot, direct module insertion
What's new in v1.3	Pin numbering that matches the docs. The first pin of each row is marked `1` and `11`, following the SFP MSA standard, so the pin numbers you read on hack-gpon.org, in a forum thread or in the pinout table map straight onto the board — start at the mark and count along, no guessing which end is which. VCC and GND marked, so you can power your stick at a glance. QR code on the back, marked GET STARTED. Scan it and you land on the setup guide: how to look up your module's pins, baud rate and voltage, how to wire it, what to do when the console stays silent. The instructions travel with the board — nothing to bookmark, nothing to lose.
Earlier revisions	v1.2 added 2 capacitors for compatibility with low-cost USB-TTL adapters (no external supply needed), a ground plane, a wider VCC trace and SFP-compliant pin numbering
Power	3.3V via VCC pin (from FTDI or external source)
Dimensions	41.25 mm × 22.5 mm

What customers say

“I finally got my SFP module working after trying several different firmwares for the (clone) Huawei module I bought. The adapter helped a lot — received in good order.”
— Misja

“Everything worked well with the adapter. Flashing and console access on my Huawei MA5671A worked flawlessly on the first try. Thanks for your work!”
— Andreas

“Successfully resurrected my bricked stick without having to do any soldering. Thanks for your help!”
— Vasil

“It did its job perfectly! I managed to unbrick my XGS-ONU-25-20NI module. After long hours of tinkering and diagnostics, I finally got it working again. What a relief — thank you so much!”
— Kevin

“I ordered the SFP-to-TTL adapter and I highly recommend it. Shipped quickly and well packaged. I managed to unbrick 2 SFP modules ;D”
— mikegleasonjr

“I wanted to let you know that the package has arrived safely! The SFP-to-TTL boards are working perfectly. Thanks again for all your help!”
— Catriel

FAQ

How do I order?

Use the Paypal form at the top of this page.
Once payment received, the item will be shipped and a tracking number provided. Usually ships the next working day.

How much is shipping/handling?

Every board is tested and packed in foam bubble wrap and sent as a tracked letter, the tracking number is always included, which is better for you and for me 🙂

Orders ship from France with La Poste, or with Happy Post for destinations La Poste no longer covers; the carrier shown at checkout is a guide and may change at dispatch. The price is calculated automatically for your country, and includes customs handling where the destination requires it, any import duties or local taxes billed on arrival are still yours to pay. If your country isn't listed, contact me here and I'll quote it.

What else do I need?

A USB-TTL 3.3V adapter and 4 female-female Dupont cables
A USB cable for your computer
A compatible SFP/ONU GPON module (FS.COM, Huawei MA5671A, etc...)
A serial console app (screen, PuTTY, minicom, ...)

My module keeps rebooting

There's an article about this.
TL;DR, it's likely a serial adapter (USB-TTL) power supply issue.

Version 1.1 relied entirely on the quality of your USB-TTL adapter.
Version 1.2 and later include 2 capacitors to help prevent this issue.

Return Policy

I'm a small-batch maker and every adapter is carefully assembled and individually tested before shipping to guarantee it works as expected.

Because of the nature of this product and the fact that it’s intended for developers, I unfortunately cannot accept returns, exchanges, or refunds.

If you have any questions before ordering or need help using the adapter, feel free to reach out, I'm happy to assist you and make sure you get the right product for your needs.

Thank you for your understanding and support 🙏

Design note: this adapter is an independent improved redesign, inspired by an open-source SFP-to-TTL board shared on GPON Hack. Thanks to the original author and the GPON hacking community. Pinout & UART guide: gpon-sfp-serial-console.