diff --git a/protos/ponsim.proto b/protos/ponsim.proto
index 2ed8914..e477d98 100644
--- a/protos/ponsim.proto
+++ b/protos/ponsim.proto
@@ -8,9 +8,14 @@
 import "openflow_13.proto";
 
 
+message PonSimOnuDeviceInfo {
+    int32 uni_port = 1;
+    string serial_number = 2;
+}
+
 message PonSimDeviceInfo {
     int32 nni_port = 1;
-    repeated int32 uni_ports = 2;
+    repeated PonSimOnuDeviceInfo onus = 2;
 }
 
 message FlowTable {
@@ -21,6 +26,7 @@
 message PonSimFrame {
     string id = 1;
     bytes payload = 2;
+    int32 out_port = 3;
 }
 
 message PonSimPacketCounter {