diff --git a/api/src/main/java/org/opencord/olt/AccessDeviceService.java b/api/src/main/java/org/opencord/olt/AccessDeviceService.java
index 9b1e574..6387a03 100644
--- a/api/src/main/java/org/opencord/olt/AccessDeviceService.java
+++ b/api/src/main/java/org/opencord/olt/AccessDeviceService.java
@@ -16,14 +16,17 @@
 
 package org.opencord.olt;
 
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
 import org.onlab.packet.VlanId;
 import org.onosproject.event.ListenerService;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.DeviceId;
+import org.opencord.sadis.SubscriberAndDeviceInformation;
 
-import java.util.Collection;
-import java.util.List;
-import java.util.Map;
+import com.google.common.collect.ImmutableMap;
 
 /**
  * Service for interacting with an access device (OLT).
@@ -77,4 +80,12 @@
      */
     List<DeviceId> fetchOlts();
 
+    /**
+     * Returns information about subscribers that have been programmed in the
+     * dataplane.
+     *
+     * @return an immutable map of locations and subscriber information
+     */
+    ImmutableMap<ConnectPoint, SubscriberAndDeviceInformation> getProgSubs();
+
 }