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diff --git a/_ont/ont-odi-realtek-dfp-34x-2c2.md b/_ont/ont-odi-realtek-dfp-34x-2c2.md
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@@ -134,6 +134,21 @@ sw_active=1
- Auto-sensing mode to switch between SGMII/HiSGMII
+# Low level modding
+
+## TTL connection
+
+The stick has exposed TTL pads:
+
+{% include image.html file="ont-odi-realtek-dfp-34x-2c2/ttl.jpg" alt="DFP-34X-2C2 TTL Connection" caption="DFP-34X-2C2 TTL Connection" %}
+
+- TX is on the left (purple lead);
+- RX on the right (white lead);
+- VCC (+3.3V) is SFP pin 15 or 16;
+- GND is on SFP pin 10;
+
+The serial port uses 115200 baud 8N1
+
# Miscellaneous Links
- [Hacking RTL960x](https://github.com/Anime4000/RTL960x)