diff --git a/ponmngr/files/etc/bbfdm/json/xpon.json b/ponmngr/files/etc/bbfdm/json/xpon.json
index e0eb9621b..8de8508bc 100644
--- a/ponmngr/files/etc/bbfdm/json/xpon.json
+++ b/ponmngr/files/etc/bbfdm/json/xpon.json
@@ -911,6 +911,7 @@
 					},
 					"PONMode": {
 						"type": "string",
+						"default": "Unknown",
 						"read": true,
 						"write": false,
 						"protocols": [
@@ -928,6 +929,7 @@
 					},
 					"Connector": {
 						"type": "string",
+						"default": "Unknown",
 						"read": true,
 						"write": false,
 						"protocols": [