diff --git a/ponsim/v2/core/ponsim_device_type.go b/ponsim/v2/core/ponsim_device_type.go
new file mode 100644
index 0000000..306440c
--- /dev/null
+++ b/ponsim/v2/core/ponsim_device_type.go
@@ -0,0 +1,17 @@
+package core
+
+type PonSimDeviceType uint8
+
+const (
+	OLT PonSimDeviceType = iota
+	ONU
+)
+
+var enum_ponsim_device_types = []string{
+	"OLT",
+	"ONU",
+}
+
+func (t PonSimDeviceType) String() string {
+	return enum_ponsim_device_types[t]
+}