diff --git a/_ont/ont-prolink-pgn6401v.md b/_ont/ont-prolink-pgn6401v.md
index f68d8c07..ff1d971f 100644
--- a/_ont/ont-prolink-pgn6401v.md
+++ b/_ont/ont-prolink-pgn6401v.md
@@ -165,21 +165,47 @@ mib set ELAN_MAC_ADDR 1A2B3C4D5E6F
 mib set LAN_IP_ADDR 192.168.8.1
 ```
 ## Switch PON Mode
+```
+# RJ45 Ethernet Mode
+mib set PON_MODE 0
+mib set WAN_PHY_PORT 0
+```
+
 ```
 # GPON mode
+mib set WAN_PHY_PORT 5
 mib set PON_MODE 1
 ```
 
 ```
 # EPON mode
+mib set WAN_PHY_PORT 5
 mib set PON_MODE 2
 ```
 
 ```
-# Ethernet mode
+# Fiber Ethernet mode
+mib set WAN_PHY_PORT 5
 mib set PON_MODE 3
 ```
 
+
+## RJ45 Ethernet PON_MODE mapping:
+```
+# for the first rj45 port (ge1)
+mib set WAN_PHY_PORT 0
+
+# for the 2nd rj45 port (ge2)
+mib set WAN_PHY_PORT 1
+
+# for the third rj45 port (ge3)
+mib set WAN_PHY_PORT 2
+
+# for the last rj45 port (ge4)
+mib set WAN_PHY_PORT 3
+```
+
+
 ## Checking the currently active image
 ```
 nv getenv sw_active