diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/faultmanagement/alarm/AlarmEntityId.java b/incubator/api/src/main/java/org/onosproject/incubator/net/faultmanagement/alarm/AlarmEntityId.java
new file mode 100644
index 0000000..5bf8674
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/faultmanagement/alarm/AlarmEntityId.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2014-2015 Open Networking Laboratory
+ *
+ * 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 org.onosproject.incubator.net.faultmanagement.alarm;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import com.google.common.collect.ImmutableSet;
+import java.net.URI;
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * Immutable representation of a alarm source. It is meaningful within the
+ * context of a device.
+ */
+public final class AlarmEntityId {
+
+    public static final AlarmEntityId NONE = new AlarmEntityId(URI.create("none:none"));
+    public static final Set<String> SCHEMES = ImmutableSet.of("none", "port", "och", "other");
+
+    private final URI uri;
+
+    private AlarmEntityId(final URI uri) {
+        this.uri = uri;
+    }
+
+    protected AlarmEntityId() {
+        uri = NONE.uri;
+    }
+
+    public static AlarmEntityId alarmEntityId(final String string) {
+        return alarmEntityId(URI.create(string));
+    }
+
+    public static AlarmEntityId alarmEntityId(final URI uri) {
+        checkArgument(SCHEMES.contains(uri.getScheme()), "Unexpected scheme");
+        return new AlarmEntityId(uri);
+    }
+
+    @Override
+    public String toString() {
+        return uri.toString();
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(uri);
+
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof AlarmEntityId) {
+            final AlarmEntityId other = (AlarmEntityId) obj;
+            return Objects.equals(this.uri, other.uri);
+        }
+        return false;
+    }
+
+}