diff --git a/internal/common/helpers.go b/internal/common/helpers.go
new file mode 100644
index 0000000..6ba022f
--- /dev/null
+++ b/internal/common/helpers.go
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package common
+
+import (
+	"github.com/opencord/voltha-protos/go/openolt"
+	"strconv"
+)
+
+func OnuSnToString(sn *openolt.SerialNumber) string {
+	s := string(sn.VendorId)
+	for _, i := range sn.VendorSpecific {
+		s = s + strconv.FormatInt(int64(i/16), 16) + strconv.FormatInt(int64(i%16), 16)
+	}
+	return s
+}