diff --git a/device/device_olt.go b/device/device_olt.go
new file mode 100644
index 0000000..a01dda1
--- /dev/null
+++ b/device/device_olt.go
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * 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 device
+
+type oltState int
+
+type Olt struct {
+	ID                 uint32
+	NumPonIntf         uint32
+	NumNniIntf         uint32
+	Mac                string
+	SerialNumber       string
+	Manufacture        string
+	Name               string
+	InternalState      oltState
+	OperState          string
+	Intfs              []intf
+	HeartbeatSignature uint32
+}
+
+type intf struct {
+	Type      string
+	IntfID    uint32
+	OperState string
+}
+
+const (
+	PRE_ENABLE oltState = iota
+	OLT_UP
+	PONIF_UP
+	ONU_DISCOVERED
+)
+
+func CreateOlt(oltid uint32, npon uint32, nnni uint32) *Olt {
+	olt := Olt{}
+	olt.ID = oltid
+	olt.NumPonIntf = npon
+	olt.NumNniIntf = nnni
+	olt.Name = "BBSIM OLT"
+	olt.InternalState = PRE_ENABLE
+	olt.OperState = "up"
+	olt.Intfs = make([]intf, olt.NumPonIntf+olt.NumNniIntf)
+	olt.HeartbeatSignature = oltid
+	for i := uint32(0); i < olt.NumNniIntf; i++ {
+		olt.Intfs[i].IntfID = i
+		olt.Intfs[i].OperState = "up"
+		olt.Intfs[i].Type = "nni"
+	}
+	for i := uint32(olt.NumNniIntf); i < olt.NumPonIntf+olt.NumNniIntf; i++ {
+		olt.Intfs[i].IntfID = i
+		olt.Intfs[i].OperState = "up"
+		olt.Intfs[i].Type = "pon"
+	}
+	return &olt
+}