diff --git a/api/src/main/java/org/opencord/olt/AccessDeviceService.java b/api/src/main/java/org/opencord/olt/AccessDeviceService.java
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+++ b/api/src/main/java/org/opencord/olt/AccessDeviceService.java
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+/*
+ * Copyright 2016-present 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.opencord.olt;
+
+import org.onlab.packet.VlanId;
+import org.onosproject.cordconfig.access.AccessDeviceData;
+import org.onosproject.event.ListenerService;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+
+import java.util.Collection;
+import java.util.Map;
+
+/**
+ * Service for interacting with an access device (OLT).
+ */
+public interface AccessDeviceService
+        extends ListenerService<AccessDeviceEvent, AccessDeviceListener> {
+
+    /**
+     * Provisions connectivity for a subscriber on an access device.
+     *
+     * @param port subscriber's connection point
+     * @param vlan VLAN ID to provision for subscriber
+     */
+    void provisionSubscriber(ConnectPoint port, VlanId vlan);
+
+    /**
+     * Removes provisioned connectivity for a subscriber from an access device.
+     *
+     * @param port subscriber's connection point
+     */
+    void removeSubscriber(ConnectPoint port);
+
+    /**
+     * Returns information about the provisioned subscribers.
+     *
+     * @return subscribers
+     */
+    Collection<Map.Entry<ConnectPoint, VlanId>> getSubscribers();
+
+    /**
+     * Returns the map of configured OLTs.
+     *
+     * @return a map
+     */
+    Map<DeviceId, AccessDeviceData> fetchOlts();
+
+}