diff --git a/python/adapters/extensions/alarms/olt/__init__.py b/python/adapters/extensions/alarms/olt/__init__.py
new file mode 100644
index 0000000..b0fb0b2
--- /dev/null
+++ b/python/adapters/extensions/alarms/olt/__init__.py
@@ -0,0 +1,13 @@
+# Copyright 2017-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.
diff --git a/python/adapters/extensions/alarms/olt/olt_los_alarm.py b/python/adapters/extensions/alarms/olt/olt_los_alarm.py
new file mode 100644
index 0000000..c8666a3
--- /dev/null
+++ b/python/adapters/extensions/alarms/olt/olt_los_alarm.py
@@ -0,0 +1,32 @@
+# Copyright 2017-present Adtran, Inc.
+#
+# 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.
+
+from voltha.protos.events_pb2 import AlarmEventType, AlarmEventSeverity, AlarmEventCategory
+from voltha.extensions.alarms.adapter_alarms import AlarmBase
+
+
+class OltLosAlarm(AlarmBase):
+    def __init__(self, alarm_mgr, intf_id, port_type_name):
+        super(OltLosAlarm, self).__init__(alarm_mgr, object_type='olt LOS',
+                                          alarm='OLT_LOS',
+                                          alarm_category=AlarmEventCategory.OLT,
+                                          alarm_type=AlarmEventType.COMMUNICATION,
+                                          alarm_severity=AlarmEventSeverity.MAJOR)
+        # Added port type to indicate if alarm was on NNI or PON
+        self._intf_id = intf_id
+        self._port_type_name = port_type_name
+
+    def get_context_data(self):
+        return {'olt-intf-id:': self._intf_id,
+                'olt-port-type-name': self._port_type_name}