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@@ -62,8 +62,50 @@ git clone --recursive https://github.com/leehongming/cutedp.git
 
 ## 4.Demo
 
-The Demo contains one WR switch and two CUTEWR-DP boards.  
-More detail information needs to be added.
+The Demo contains one WR switch and three CUTEWR-DP boards. The WR
+switch acts as the Grandmaster(Layer 1) in this small network, and three
+CUTEWR-DP boards are connected one by one. They are in Layer 2/3/4 of
+this network seperately.  
+In each board, use the blue SFP (AXGE-1254-0531) in SFP0 and red SFP
+(AXGE-3454-0531) in SFP1. (The label of each SFP is on the PCB)  
+Use the command below to change the parameters of each port.
+
+  - The SFP\_PN is AXGE-1254-0531 or AXGE-3454-0531 if you use the SFPs
+    produced by AXCEN. 
+  - The port is 0 or 1.
+  - The units of dtx\_value and drx\_value are picosecond.
+  - alpha value is depended on your fiber.
+
+<!-- end list -->
+
+    sfp erase
+    sfp add SFP_PN port dtx_value drx_value alpha_value
+
+Use the command below to set the IP of each port.
+
+  - command "ip set ip\_addr" will set the ip address of port 0. The ip
+    address of port 1 will be ip address of port 0 adds 1.
+
+<!-- end list -->
+
+    ip set ip_addr_port0
+
+Use the command below to start or stop the PTP of each port.
+
+    ptp start (start both two ports)
+    ptp start 0/1 (start the selected port)
+    ptp stop (stop both two ports)
+    ptp stop 0/1 (stop the selected port)
+
+Use the command "gui" to get the PTP status of each port.  
+The results are shown as
+below:  
+![](/uploads/1e0fa35579cff52e827b9ef41b4f254c/CUTEWR-DP-gui.png)
+
+The demo synchronization results are shown as below, C1(yellow) is the
+WR switch while C2/C3/C4 are CUTEWR-DP
+boards:  
+![](/uploads/b675b9f61b659cc8cd3291a4fc2be556/CUTEWR-DP-PPS-results.png)
 
 ## 5\. Current status