diff --git a/ponsim/bal_servicer.py b/ponsim/bal_servicer.py
new file mode 100644
index 0000000..f036d67
--- /dev/null
+++ b/ponsim/bal_servicer.py
@@ -0,0 +1,74 @@
+#
+# 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.
+#
+import structlog
+from common.utils.grpc_utils import twisted_async
+from voltha.protos import third_party
+from voltha.protos.ponsim_pb2 import PonSimDeviceInfo
+from google.protobuf.empty_pb2 import Empty
+from voltha.adapters.asfvolt16_olt.protos.bal_pb2 import BalServicer, BalErr
+from voltha.adapters.asfvolt16_olt.protos.bal_errno_pb2 import BAL_ERR_OK
+
+_ = third_party
+
+log = structlog.get_logger()
+
+class BalHandler(BalServicer):
+
+    def __init__(self, thread_pool, ponsim):
+        self.thread_pool = thread_pool
+        self.ponsim = ponsim
+
+    @twisted_async
+    def GetDeviceInfo(self, request, context):
+        log.info('get-device-info')
+        ports = self.ponsim.get_ports()
+        return PonSimDeviceInfo(
+            nni_port=ports[0],
+            uni_ports=ports[1:]
+        )
+
+    @twisted_async
+    def UpdateFlowTable(self, request, context):
+        log.info('flow-table-update', request=request, port=request.port)
+        if request.port == 0:
+            # by convention this is the olt port
+            self.ponsim.olt_install_flows(request.flows)
+        else:
+            self.ponsim.onu_install_flows(request.port, request.flows)
+        return Empty()
+
+    def GetStats(self, request, context):
+        return self.ponsim.get_stats()
+
+    def BalApiInit(self, request, context):
+        log.info('olt-connection-successful', request=request)
+        return BalErr(err=BAL_ERR_OK)
+
+    def BalApiFinish(self, request, context):
+        log.info('BalApi', request=request)
+        return BalErr(err=BAL_ERR_OK)
+
+    def BalCfgSet(self, request, context):
+        log.info('olt-activation-successful', request=request)
+        return BalErr(err=BAL_ERR_OK)
+
+    def BalAccessTerminalCfgSet(self, request, context):
+        log.info('olt-activation-successful', request=request)
+        return BalErr(err=BAL_ERR_OK)
+
+    def BalCfgClear(self, request, context):
+        log.info('BalCfClear', request=request)
+        return BalErr(err=BAL_ERR_OK)
diff --git a/ponsim/grpc_server.py b/ponsim/grpc_server.py
index fb08346..13d0ab9 100644
--- a/ponsim/grpc_server.py
+++ b/ponsim/grpc_server.py
@@ -18,65 +18,12 @@
 import os
 from concurrent import futures
 
-from common.utils.grpc_utils import twisted_async
 from voltha.protos import third_party
-from voltha.protos.ponsim_pb2 import PonSimServicer, \
-    add_PonSimServicer_to_server, PonSimDeviceInfo
-from google.protobuf.empty_pb2 import Empty
-
-from voltha.protos.ponsim_pb2 import XPonSimServicer, add_XPonSimServicer_to_server
 
 _ = third_party
 
 log = structlog.get_logger()
 
-
-class FlowUpdateHandler(PonSimServicer):
-
-    def __init__(self, thread_pool, ponsim):
-        self.thread_pool = thread_pool
-        self.ponsim = ponsim
-
-    @twisted_async
-    def GetDeviceInfo(self, request, context):
-        log.info('get-device-info')
-        ports = self.ponsim.get_ports()
-        return PonSimDeviceInfo(
-            nni_port=ports[0],
-            uni_ports=ports[1:]
-        )
-
-    @twisted_async
-    def UpdateFlowTable(self, request, context):
-        log.info('flow-table-update', request=request, port=request.port)
-        if request.port == 0:
-            # by convention this is the olt port
-            self.ponsim.olt_install_flows(request.flows)
-        else:
-            self.ponsim.onu_install_flows(request.port, request.flows)
-        return Empty()
-
-    def GetStats(self, request, context):
-        return self.ponsim.get_stats()
-
-class XPonHandler(XPonSimServicer):
-
-    def __init__(self, thread_pool, x_pon_sim):
-        self.thread_pool = thread_pool
-        self.x_pon_sim = x_pon_sim
-
-    def CreateInterface(self, request, context):
-        self.x_pon_sim.CreateInterface(request)
-        return Empty()
-
-    def UpdateInterface(self, request, context):
-        self.x_pon_sim.UpdateInterface(request)
-        return Empty()
-
-    def RemoveInterface(self, request, context):
-        self.x_pon_sim.RemoveInterface(request)
-        return Empty()
-
 class GrpcServer(object):
 
     def __init__(self, port, ponsim, x_pon_sim):
@@ -86,12 +33,16 @@
         self.ponsim = ponsim
         self.x_pon_sim = x_pon_sim
 
-    def start(self):
+    '''
+    service_list: a list of (add_xyzSimServicer_to_server, xyzServicerClass)
+    e.g. [(add_PonSimServicer_to_server, FlowUpdateHandler),
+          (add_XPonSimServicer_to_server, XPonHandler)]
+    '''
+    def start(self, service_list):
         log.debug('starting')
-        handler = FlowUpdateHandler(self.thread_pool, self.ponsim)
-        add_PonSimServicer_to_server(handler, self.server)
-        x_pon_handler = XPonHandler(self.thread_pool, self.x_pon_sim)
-        add_XPonSimServicer_to_server(x_pon_handler, self.server)
+        for add_x_to_server, xServiceClass in service_list:
+            x_handler = xServiceClass(self.thread_pool, self.ponsim)
+            add_x_to_server(x_handler, self.server)
 
         # read in key and certificate
         try:
@@ -108,7 +59,6 @@
         # create server credentials
         server_credentials = grpc.ssl_server_credentials(((private_key, certificate_chain,),))
         self.server.add_secure_port('[::]:%s' % self.port, server_credentials)
-
         self.server.start()
         log.info('started')
 
diff --git a/ponsim/main.py b/ponsim/main.py
index 3140afd..63b47f6 100755
--- a/ponsim/main.py
+++ b/ponsim/main.py
@@ -28,16 +28,21 @@
 
 from common.structlog_setup import setup_logging
 from grpc_server import GrpcServer
-from ponsim import PonSim
 from realio import RealIo
-
+from voltha.protos.ponsim_pb2 import add_PonSimServicer_to_server
+from voltha.protos.ponsim_pb2 import add_XPonSimServicer_to_server
+from voltha.adapters.asfvolt16_olt.protos.bal_pb2 import add_BalServicer_to_server
+import ponsim_servicer
+import bal_servicer
+from ponsim import PonSim
 from ponsim import XPonSim
 
 defs = dict(
     config=os.environ.get('CONFIG', './ponsim.yml'),
     grpc_port=int(os.environ.get('GRPC_PORT', 50060)),
     name=os.environ.get('NAME', 'pon1'),
-    onus=int(os.environ.get("ONUS", 1))
+    onus=int(os.environ.get("ONUS", 1)),
+    device_type='ponsim'
 )
 
 
@@ -139,6 +144,14 @@
                         default=False,
                         help=_help)
 
+    _help = ('device type - ponsim or bal'
+             ' (default: %s)' % defs['device_type'])
+    parser.add_argument('-d', '--device_type',
+                        dest='device_type',
+                        action='store',
+                        default=defs['device_type'],
+                        help=_help)
+
     args = parser.parse_args()
 
     return args
@@ -169,13 +182,19 @@
         if not args.no_banner:
             print_banner(self.log)
 
-        self.startup_components()
+        if args.device_type == 'ponsim':
+            grpc_services =  [(add_PonSimServicer_to_server, ponsim_servicer.FlowUpdateHandler)]
+        elif args.device_type == 'bal':
+            grpc_services =  [(add_BalServicer_to_server, bal_servicer.BalHandler)]
+        grpc_services.append((add_XPonSimServicer_to_server, ponsim_servicer.XPonHandler))
+
+        self.startup_components(grpc_services)
 
     def start(self):
         self.start_reactor()  # will not return except Keyboard interrupt
 
     @inlineCallbacks
-    def startup_components(self):
+    def startup_components(self, grpc_services):
         try:
             self.log.info('starting-internal-components')
 
@@ -188,7 +207,7 @@
             self.x_pon_sim = XPonSim()
 
             self.grpc_server = GrpcServer(self.args.grpc_port, self.ponsim, self.x_pon_sim)
-            yield self.grpc_server.start()
+            yield self.grpc_server.start(grpc_services)
 
             self.log.info('started-internal-services')
 
diff --git a/ponsim/ponsim_servicer.py b/ponsim/ponsim_servicer.py
new file mode 100644
index 0000000..b7a524f
--- /dev/null
+++ b/ponsim/ponsim_servicer.py
@@ -0,0 +1,71 @@
+#
+# 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.
+#
+import structlog
+from common.utils.grpc_utils import twisted_async
+from voltha.protos import third_party
+from voltha.protos.ponsim_pb2 import PonSimServicer, PonSimDeviceInfo
+from google.protobuf.empty_pb2 import Empty
+from voltha.protos.ponsim_pb2 import XPonSimServicer
+
+_ = third_party
+
+log = structlog.get_logger()
+
+class FlowUpdateHandler(PonSimServicer):
+
+    def __init__(self, thread_pool, ponsim):
+        self.thread_pool = thread_pool
+        self.ponsim = ponsim
+
+    @twisted_async
+    def GetDeviceInfo(self, request, context):
+        log.info('get-device-info')
+        ports = self.ponsim.get_ports()
+        return PonSimDeviceInfo(
+            nni_port=ports[0],
+            uni_ports=ports[1:]
+        )
+
+    @twisted_async
+    def UpdateFlowTable(self, request, context):
+        log.info('flow-table-update', request=request, port=request.port)
+        if request.port == 0:
+            # by convention this is the olt port
+            self.ponsim.olt_install_flows(request.flows)
+        else:
+            self.ponsim.onu_install_flows(request.port, request.flows)
+        return Empty()
+
+    def GetStats(self, request, context):
+        return self.ponsim.get_stats()
+
+class XPonHandler(XPonSimServicer):
+
+    def __init__(self, thread_pool, x_pon_sim):
+        self.thread_pool = thread_pool
+        self.x_pon_sim = x_pon_sim
+
+    def CreateInterface(self, request, context):
+        self.x_pon_sim.CreateInterface(request)
+        return Empty()
+
+    def UpdateInterface(self, request, context):
+        self.x_pon_sim.UpdateInterface(request)
+        return Empty()
+
+    def RemoveInterface(self, request, context):
+        self.x_pon_sim.RemoveInterface(request)
+        return Empty()