diff --git a/voltha/adapters/asfvolt16_olt/__init__.py b/voltha/adapters/asfvolt16_olt/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/voltha/adapters/asfvolt16_olt/__init__.py
diff --git a/voltha/adapters/asfvolt16_olt/asfvolt16_olt.py b/voltha/adapters/asfvolt16_olt/asfvolt16_olt.py
new file mode 100644
index 0000000..42e9838
--- /dev/null
+++ b/voltha/adapters/asfvolt16_olt/asfvolt16_olt.py
@@ -0,0 +1,123 @@
+#
+# Copyright 2017 the original author or authors.
+#
+# 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.
+#
+
+"""
+Asfvolt16 OLT adapter
+"""
+
+import structlog
+from zope.interface import implementer
+
+from voltha.protos.device_pb2 import DeviceType, DeviceTypes
+from voltha.adapters.interface import IAdapterInterface
+from voltha.protos.adapter_pb2 import Adapter
+from voltha.protos.adapter_pb2 import AdapterConfig
+from voltha.protos.common_pb2 import LogLevel
+
+log = structlog.get_logger()
+
+@implementer(IAdapterInterface)
+class Asfvolt16Adapter(object):
+    name = 'asfvolt16_olt'
+
+    supported_device_types = [
+        DeviceType(
+            id=name,
+            adapter=name,
+            accepts_bulk_flow_update=False
+        )
+    ]
+
+    def __init__(self, adapter_agent, config):
+        self.adapter_agent = adapter_agent
+        self.config = config
+        self.descriptor = Adapter(
+            id=self.name,
+            vendor='Edgecore',
+            version='0.1',
+            config=AdapterConfig(log_level=LogLevel.INFO)
+        )
+
+        # register for adapter messages
+        self.adapter_agent.register_for_inter_adapter_messages()
+
+    def start(self):
+        log.debug('starting')
+        log.info('started')
+
+    def stop(self):
+        log.debug('stopping')
+        log.info('stopped')
+
+    def adapter_descriptor(self):
+        return self.descriptor
+
+    def device_types(self):
+        return DeviceTypes(items=self.supported_device_types)
+
+    def health(self):
+        raise NotImplementedError()
+
+    def change_master_state(self, master):
+        raise NotImplementedError()
+
+    def update_pm_config(self, device, pm_config):
+        raise NotImplementedError()
+
+    def adopt_device(self, device):
+        raise NotImplementedError()
+
+    def abandon_device(self, device):
+        raise NotImplementedError()
+
+    def disable_device(self, device):
+        raise NotImplementedError()
+
+    def reenable_device(self, device):
+        raise NotImplementedError()
+
+    def reboot_device(self, device):
+        raise NotImplementedError()
+
+    def delete_device(self, device):
+        raise NotImplementedError()
+
+    def get_device_details(self, device):
+        raise NotImplementedError()
+
+    def update_flows_bulk(self, device, flows, groups):
+        raise NotImplementedError()
+
+    def update_flows_incrementally(self, device, flow_changes, group_changes):
+        raise NotImplementedError()
+
+    def send_proxied_message(self, proxy_address, msg):
+        raise NotImplementedError()
+
+    def receive_proxied_message(self, proxy_address, msg):
+        raise NotImplementedError()
+
+    def receive_packet_out(self, logical_device_id, egress_port_no, msg):
+        raise NotImplementedError()
+
+    def receive_inter_adapter_message(self, msg):
+        raise NotImplementedError()
+
+    def suppress_alarm(self, filter):
+        raise NotImplementedError()
+
+    def unsuppress_alarm(self, filter):
+        raise NotImplementedError()
diff --git a/voltha/adapters/asfvolt16_olt/protos/bal_model_types.proto b/voltha/adapters/asfvolt16_olt/protos/bal_model_types.proto
index 2b417c6..5adb020 100644
--- a/voltha/adapters/asfvolt16_olt/protos/bal_model_types.proto
+++ b/voltha/adapters/asfvolt16_olt/protos/bal_model_types.proto
@@ -331,8 +331,7 @@
  */
 message BalAggregationPortIdList
 {
-    uint32 len = 1;                        /**< List length in uint8 (bytes). */
-    repeated uint32 val = 2;    /**< List contents. */
+    repeated uint32 val = 1;    /**< List contents. */
 }
 
 /** classifier.
@@ -382,8 +381,7 @@
  */
 message BalFlowIdList
 {
-    uint32 len = 1;           /**< List length. */
-    repeated uint32 val = 2;    /**< List contents. */
+    repeated uint32 val = 1;    /**< List contents. */
 }
 
 /** Queue Reference
@@ -406,10 +404,9 @@
 
 /** Variable-length list of groupMemberInfo.
  */
-message BalGroupMemberInfoList_u16
+message BalGroupMemberInfoList
 {
-    uint32 len = 1;                   /**< List length. */
-    repeated BalGroupMemberInfo val = 2;  /**< List contents. */
+    repeated BalGroupMemberInfo val = 1;  /**< List contents. */
 }
 
 /** Serial number.
@@ -422,10 +419,9 @@
 
 /** Variable-length list of servicePortId.
  */
-message uint32List_u8
+message SvcPortIdList
 {
-    uint32 len = 1;                    /**< List length. */
-    repeated uint32 val = 2;    /**< List contents. */
+    repeated uint32 val = 1;    /**< List contents. */
 }
 
 /** SLA.
@@ -439,10 +435,9 @@
 
 /** Variable-length list of subId.
  */
-message uint32List_u16
+message SubTermIdList
 {
-    uint32 len = 1;       /**< List length. */
-    repeated uint32 val = 2; /**< List contents. */
+    repeated uint32 val = 1; /**< List contents. */
 }
 
 /** Random Early Discard Configuration
@@ -485,16 +480,14 @@
  */
 message BalTmQueueIdList
 {
-    uint32 len = 1;                /**< List length. */
-    repeated uint32 val = 2;    /**< List contents. */
+    repeated uint32 val = 1;    /**< List contents. */
 }
 
 /** Variable-length list of TmSchedId.
  */
 message BalTmSchedIdList
 {
-    uint32 len = 1;                /**< List length. */
-    repeated uint32 val = 2;    /**< List contents. */
+    repeated uint32 val = 1;    /**< List contents. */
 }
 
 /** TM Scheduler Owner
@@ -575,14 +568,6 @@
     uint32 nrt_profile = 6;    /**< NRT Profile */
 }
 
-/** Variable-length list of U8.
- */
-message BalU8List
-{
-    uint32 len = 1;   /**< List length. */
-    repeated uint32 val = 2;   /**< List contents. */
-}
-
 /** Structure definition for the "key" group of the "access_terminal" object.
  */
 message BalAccessTerminalKey
@@ -723,7 +708,7 @@
 message BalGroupCfgData
 {
     BalGroupMemberCmd members_cmd = 1;        /**< Membership operation commands. */
-    BalGroupMemberInfoList_u16 members = 2;  /**< The list of members associated with this group */
+    BalGroupMemberInfoList members = 2;  /**< The list of members associated with this group */
     uint64 cookie = 3;                       /**< Application cookie */
     BalFlowIdList flows = 4;              /**< List of flows associated with this group */
     BalGroupOwner owner = 5;                   /**< Owner of the group. */
@@ -759,7 +744,7 @@
     BalControl flow_control = 8;    /**< Flow control enable or disable */
     uint32 ds_tm = 9;       /**< Downstream scheduler and shaper */
     uint32 us_tm = 10;       /**< Upstream scheduler and shaper */
-    uint32List_u16 sub_term_id_list = 11;    /**< A list of subscriber terminal ids configured on this interface */
+    SubTermIdList sub_term_id_list = 11;    /**< A list of subscriber terminal ids configured on this interface */
 }
 
 /** Transport message definition for "cfg" group of "interface" object.
@@ -832,7 +817,7 @@
     BalIntfType intf_type = 4;         /**< Interface Type. */
     uint32 svc_port = 5;    /**< N/A for sending a packet */
     uint64 flow_cookie = 6;          /**< N/A for sending a packet */
-    BalU8List pkt = 7;             /**< Packet Data. */
+    bytes pkt = 7;             /**< Packet Data. */
 }
 
 /** Transport message definition for "cfg" group of "packet" object.
@@ -853,7 +838,7 @@
     BalIntfType intf_type = 4;         /**< Interface Type. */
     uint32 svc_port = 5;    /**< N/A for sending a packet */
     uint64 flow_cookie = 6;          /**< N/A for sending a packet */
-    BalU8List pkt = 7;             /**< Packet Data. */
+    bytes pkt = 7;             /**< Packet Data. */
 }
 
 /** Transport message definition for "ind" group of "packet" object.
@@ -888,7 +873,7 @@
     bytes mac_address = 7;                          /**< The Ethernet MAC address of an EPON subscriber terminal */
     uint32 ds_tm = 8;                               /**< Downstream scheduler and shaper */
     uint32 us_tm = 9;                               /**< Upstream scheduler and shaper */
-    uint32List_u8 svc_port_id_list = 10;        /**< A list of bearer traffic svc_port_ids associated with this subscriber terminal */
+    SvcPortIdList svc_port_id_list = 10;        /**< A list of bearer traffic svc_port_ids associated with this subscriber terminal */
     BalAggregationPortIdList agg_port_id_list = 11;    /**< A list of aggrPort_ids associated with this subscriber terminal */
 }