diff --git a/adapters/adtran_olt/codec/olt_config.py b/adapters/adtran_olt/codec/olt_config.py
new file mode 100644
index 0000000..473e2f6
--- /dev/null
+++ b/adapters/adtran_olt/codec/olt_config.py
@@ -0,0 +1,329 @@
+# Copyright 2017-present Adtran, Inc.
+#
+# 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
+
+log = structlog.get_logger()
+
+
+class OltConfig(object):
+    """
+    Class to wrap decode of olt container (config) from the ADTRAN
+    gpon-olt-hw.yang YANG model
+    """
+    def __init__(self, packet):
+        self._packet = packet
+        self._pons = None
+
+    def __str__(self):
+        return "OltConfig: {}".format(self.olt_id)
+
+    @property
+    def olt_id(self):
+        """Unique OLT identifier"""
+        return self._packet.get('olt-id', '')
+
+    @property
+    def debug_output(self):
+        """least important level that will output everything"""
+        return self._packet.get('debug-output', 'warning')
+
+    @property
+    def pons(self):
+        if self._pons is None:
+            self._pons = OltConfig.Pon.decode(self._packet.get('pon', None))
+        return self._pons
+
+    class Pon(object):
+        """
+        Provides decode of PON list from within
+        """
+        def __init__(self, packet):
+            assert 'pon-id' in packet, 'pon-id not found'
+            self._packet = packet
+            self._onus = None
+
+        def __str__(self):
+            return "OltConfig.Pon: pon-id: {}".format(self.pon_id)
+
+        @staticmethod
+        def decode(pon_list):
+            pons = {}
+
+            if pon_list is not None:
+                for pon_data in pon_list:
+                    pon = OltConfig.Pon(pon_data)
+                    assert pon.pon_id not in pons
+                    pons[pon.pon_id] = pon
+
+            return pons
+
+        @property
+        def pon_id(self):
+            """PON identifier"""
+            return self._packet['pon-id']
+
+        @property
+        def enabled(self):
+            """The desired state of the interface"""
+            return self._packet.get('enabled', False)
+
+        @property
+        def downstream_fec_enable(self):
+            """Enables downstream Forward Error Correction"""
+            return self._packet.get('downstream-fec-enable', False)
+
+        @property
+        def upstream_fec_enable(self):
+            """Enables upstream Forward Error Correction"""
+            return self._packet.get('upstream-fec-enable', False)
+
+        @property
+        def deployment_range(self):
+            """Maximum deployment distance (meters)"""
+            return self._packet.get('deployment-range', 25000)
+
+        @property
+        def onus(self):
+            if self._onus is None:
+                self._onus = OltConfig.Pon.Onu.decode(self._packet.get('onus', None))
+            return self._onus
+
+        class Onu(object):
+            """
+            Provides decode of onu list for a PON port
+            """
+            def __init__(self, packet):
+                assert 'onu-id' in packet, 'onu-id not found'
+                self._packet = packet
+                self._tconts = None
+                self._tconts_dict = None
+                self._gem_ports = None
+                self._gem_ports_dict = None
+
+            def __str__(self):
+                return "OltConfig.Pon.Onu: onu-id: {}".format(self.onu_id)
+
+            @staticmethod
+            def decode(onu_dict):
+                onus = {}
+
+                if onu_dict is not None:
+                    if 'onu' in onu_dict:
+                        for onu_data in onu_dict['onu']:
+                            onu = OltConfig.Pon.Onu(onu_data)
+                            assert onu.onu_id not in onus
+                            onus[onu.onu_id] = onu
+                    elif len(onu_dict) > 0 and 'onu-id' in onu_dict[0]:
+                        onu = OltConfig.Pon.Onu(onu_dict[0])
+                        assert onu.onu_id not in onus
+                        onus[onu.onu_id] = onu
+
+                return onus
+
+            @property
+            def onu_id(self):
+                """The ID used to identify the ONU"""
+                return self._packet['onu-id']
+
+            @property
+            def serial_number_64(self):
+                """The serial number (base-64) is unique for each ONU"""
+                return self._packet.get('serial-number', '')
+
+            @property
+            def password(self):
+                """ONU Password"""
+                return self._packet.get('password', bytes(0))
+
+            @property
+            def enable(self):
+                """If true, places the ONU in service"""
+                return self._packet.get('enable', False)
+
+            @property
+            def tconts(self):
+                if self._tconts is None:
+                    self._tconts = OltConfig.Pon.Onu.TCont.decode(self._packet.get('t-conts', None))
+                return self._tconts
+
+            @property
+            def tconts_dict(self):               # TODO: Remove if not used
+                if self._tconts_dict is None:
+                    self._tconts_dict = {tcont.alloc_id: tcont for tcont in self.tconts}
+                return self._tconts_dict
+
+            @property
+            def gem_ports(self):
+                if self._gem_ports is None:
+                    self._gem_ports = OltConfig.Pon.Onu.GemPort.decode(self._packet.get('gem-ports', None))
+                return self._gem_ports
+
+            @property
+            def gem_ports_dict(self):               # TODO: Remove if not used
+                if self._gem_ports_dict is None:
+                    self._gem_ports_dict = {gem.gem_id: gem for gem in self.gem_ports}
+                return self._gem_ports_dict
+
+            class TCont(object):
+                """
+                Provides decode of onu list for the T-CONT container
+                """
+                def __init__(self, packet):
+                    assert 'alloc-id' in packet, 'alloc-id not found'
+                    self._packet = packet
+                    self._traffic_descriptor = None
+                    self._best_effort = None
+
+                def __str__(self):
+                    return "OltConfig.Pon.Onu.TCont: alloc-id: {}".format(self.alloc_id)
+
+                @staticmethod
+                def decode(tcont_container):
+                    tconts = {}
+
+                    if tcont_container is not None:
+                        for tcont_data in tcont_container.get('t-cont', []):
+                            tcont = OltConfig.Pon.Onu.TCont(tcont_data)
+                            assert tcont.alloc_id not in tconts
+                            tconts[tcont.alloc_id] = tcont
+
+                    return tconts
+
+                @property
+                def alloc_id(self):
+                    """The ID used to identify the T-CONT"""
+                    return self._packet['alloc-id']
+
+                @property
+                def traffic_descriptor(self):
+                    """
+                    Each Alloc-ID is provisioned with a traffic descriptor that specifies
+                    the three bandwidth component parameters: fixed bandwidth, assured
+                    bandwidth, and maximum bandwidth, as well as the ternary eligibility
+                    indicator for additional bandwidth assignment
+                    """
+                    if self._traffic_descriptor is None and 'traffic-descriptor' in self._packet:
+                        self._traffic_descriptor = OltConfig.Pon.Onu.TCont.\
+                            TrafficDescriptor(self._packet['traffic-descriptor'])
+                    return self._traffic_descriptor
+
+                class TrafficDescriptor(object):
+                    def __init__(self, packet):
+                        self._packet = packet
+
+                    def __str__(self):
+                        return "OltConfig.Pon.Onu.TCont.TrafficDescriptor: {}/{}/{}".\
+                            format(self.fixed_bandwidth, self.assured_bandwidth,
+                                   self.maximum_bandwidth)
+
+                    @property
+                    def fixed_bandwidth(self):
+                        try:
+                            return int(self._packet.get('fixed-bandwidth', 0))
+                        except:
+                            return 0
+
+                    @property
+                    def assured_bandwidth(self):
+                        try:
+                            return int(self._packet.get('assured-bandwidth', 0))
+                        except:
+                            return 0
+
+                    @property
+                    def maximum_bandwidth(self):
+                        try:
+                            return int(self._packet.get('maximum-bandwidth', 0))
+                        except:
+                            return 0
+
+                    @property
+                    def additional_bandwidth_eligibility(self):
+                        return self._packet.get('additional-bandwidth-eligibility', 'none')
+
+                @property
+                def best_effort(self):
+                    if self._best_effort is None:
+                        self._best_effort = OltConfig.Pon.Onu.TCont.BestEffort.decode(
+                            self._packet.get('best-effort', None))
+                    return self._best_effort
+
+                class BestEffort(object):
+                    def __init__(self, packet):
+                        self._packet = packet
+
+                    def __str__(self):
+                        return "OltConfig.Pon.Onu.TCont.BestEffort: {}".format(self.bandwidth)
+
+                    @property
+                    def bandwidth(self):
+                        return self._packet['bandwidth']
+
+                    @property
+                    def priority(self):
+                        return self._packet['priority']
+
+                    @property
+                    def weight(self):
+                        return self._packet['weight']
+
+            class GemPort(object):
+                """
+                Provides decode of onu list for the gem-ports container
+                """
+                def __init__(self, packet):
+                    assert 'port-id' in packet, 'port-id not found'
+                    self._packet = packet
+
+                def __str__(self):
+                    return "OltConfig.Pon.Onu.GemPort: port-id: {}/{}".\
+                        format(self.port_id, self.alloc_id)
+
+                @staticmethod
+                def decode(gem_port_container):
+                    gem_ports = {}
+
+                    if gem_port_container is not None:
+                        for gem_port_data in gem_port_container.get('gem-port', []):
+                            gem_port = OltConfig.Pon.Onu.GemPort(gem_port_data)
+                            assert gem_port.port_id not in gem_ports
+                            gem_ports[gem_port.port_id] = gem_port
+
+                    return gem_ports
+
+                @property
+                def port_id(self):
+                    """The ID used to identify the GEM Port"""
+                    return self._packet['port-id']
+
+                @property
+                def gem_id(self):
+                    """The ID used to identify the GEM Port"""
+                    return self.port_id
+
+                @property
+                def alloc_id(self):
+                    """The Alloc-ID of the T-CONT to which this GEM port is mapped"""
+                    return self._packet['alloc-id']
+
+                @property
+                def omci_transport(self):
+                    """If true, this GEM port is used to transport the OMCI virtual connection"""
+                    return self._packet.get('omci-transport', False)
+
+                @property
+                def encryption(self):
+                    """If true, enable encryption using the advanced encryption standard(AES)"""
+                    return self._packet.get('encryption', False)