+ Figure 5 - UE Attach Flow
+
+
+O1 Netconf get-alarm list procedure
+-----------------------------------
+
+This section describes the *Health Status Retrieval* scenario of O-DU High health-check. It enables a northbound client(SMO) to retrieve the health of the ODU-High based on the last self-check performed. The alarm-list is provided as the response to the request via O1 Netconf interface.
+
+
+.. figure:: ODU-O1-GetAlarmListFlow.jpg
+ :width: 720
+ :alt: Figure 6 O1 get alarm-list flow
+
+ Figure 6 - O1 get alarm-list flow
+
+
+As seen in the Figure 6,
+
+- On the cell state change from de-active to activate, ODU High process raises a cell up alarm message and sends it over the TCP socket using the TCP client Alarm Interface API.
+
+- On other side a TCP server, running as a thread, in O1 module receives the cell up alarm message and it passes the alarm information to the Alarm Manager.
+
+- Alarm Manager stores the alarm data in a list.