diff --git a/internal/pkg/core/openolt_eventmgr.go b/internal/pkg/core/openolt_eventmgr.go
new file mode 100644
index 0000000..4e21d11
--- /dev/null
+++ b/internal/pkg/core/openolt_eventmgr.go
@@ -0,0 +1,504 @@
+/*
+ * 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 core provides APIs for the openOLT adapter
+package core
+
+import (
+	ctx "context"
+	"fmt"
+	"strconv"
+
+	"github.com/opencord/voltha-lib-go/v3/pkg/adapters/adapterif"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-protos/v3/go/common"
+	oop "github.com/opencord/voltha-protos/v3/go/openolt"
+	"github.com/opencord/voltha-protos/v3/go/voltha"
+)
+
+const (
+	onuDiscoveryEvent           = "ONU_DISCOVERY"
+	onuLosEvent                 = "ONU_LOSS_OF_SIGNAL"
+	onuLobEvent                 = "ONU_LOSS_OF_BURST"
+	onuLopcMissEvent            = "ONU_LOPC_MISS"
+	onuLopcMicErrorEvent        = "ONU_LOPC_MIC_ERROR"
+	oltLosEvent                 = "OLT_LOSS_OF_SIGNAL"
+	oltIndicationDown           = "OLT_DOWN_INDICATION"
+	onuDyingGaspEvent           = "ONU_DYING_GASP"
+	onuSignalsFailEvent         = "ONU_SIGNALS_FAIL"
+	onuStartupFailEvent         = "ONU_STARTUP_FAIL"
+	onuSignalDegradeEvent       = "ONU_SIGNAL_DEGRADE"
+	onuDriftOfWindowEvent       = "ONU_DRIFT_OF_WINDOW"
+	onuActivationFailEvent      = "ONU_ACTIVATION_FAIL"
+	onuProcessingErrorEvent     = "ONU_PROCESSING_ERROR"
+	onuTiwiEvent                = "ONU_TRANSMISSION_WARNING"
+	onuLossOmciEvent            = "ONU_LOSS_OF_OMCI_CHANNEL"
+	onuLossOfKeySyncEvent       = "ONU_LOSS_OF_KEY_SYNC"
+	onuLossOfFrameEvent         = "ONU_LOSS_OF_FRAME"
+	onuLossOfPloamEvent         = "ONU_LOSS_OF_PLOAM"
+	ponIntfDownIndiction        = "OLT_PON_INTERFACE_DOWN"
+	onuDeactivationFailureEvent = "ONU_DEACTIVATION_FAILURE"
+)
+
+const (
+	pon           = voltha.EventSubCategory_PON
+	olt           = voltha.EventSubCategory_OLT
+	ont           = voltha.EventSubCategory_ONT
+	onu           = voltha.EventSubCategory_ONU
+	nni           = voltha.EventSubCategory_NNI
+	service       = voltha.EventCategory_SERVICE
+	security      = voltha.EventCategory_SECURITY
+	equipment     = voltha.EventCategory_EQUIPMENT
+	processing    = voltha.EventCategory_PROCESSING
+	environment   = voltha.EventCategory_ENVIRONMENT
+	communication = voltha.EventCategory_COMMUNICATION
+)
+
+const (
+	// statusCheckOn represents status check On
+	statusCheckOn = "on"
+	// statusCheckOff represents status check Off
+	statusCheckOff = "off"
+	// operationStateUp represents operation state Up
+	operationStateUp = "up"
+	// operationStateDown represents operation state Down
+	operationStateDown = "down"
+	// base10 represents base 10 conversion
+	base10 = 10
+)
+
+// OpenOltEventMgr struct contains
+type OpenOltEventMgr struct {
+	eventProxy adapterif.EventProxy
+	handler    *DeviceHandler
+}
+
+// NewEventMgr is a Function to get a new event manager struct for the OpenOLT to process and publish OpenOLT event
+func NewEventMgr(eventProxy adapterif.EventProxy, handler *DeviceHandler) *OpenOltEventMgr {
+	var em OpenOltEventMgr
+	em.eventProxy = eventProxy
+	em.handler = handler
+	return &em
+}
+
+// ProcessEvents is function to process and publish OpenOLT event
+func (em *OpenOltEventMgr) ProcessEvents(alarmInd *oop.AlarmIndication, deviceID string, raisedTs int64) error {
+	var err error
+	switch alarmInd.Data.(type) {
+	case *oop.AlarmIndication_LosInd:
+		log.Infow("Received LOS indication", log.Fields{"alarm_ind": alarmInd})
+		err = em.oltLosIndication(alarmInd.GetLosInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuAlarmInd:
+		log.Infow("Received onu alarm indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuAlarmIndication(alarmInd.GetOnuAlarmInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_DyingGaspInd:
+		log.Infow("Received dying gasp indication", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuDyingGaspIndication(alarmInd.GetDyingGaspInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuActivationFailInd:
+		log.Infow("Received onu activation fail indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuActivationFailIndication(alarmInd.GetOnuActivationFailInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuLossOmciInd:
+		log.Infow("Received onu loss omci indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuLossOmciIndication(alarmInd.GetOnuLossOmciInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuDriftOfWindowInd:
+		log.Infow("Received onu drift of window indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuDriftOfWindowIndication(alarmInd.GetOnuDriftOfWindowInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuSignalDegradeInd:
+		log.Infow("Received onu signal degrade indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuSignalDegradeIndication(alarmInd.GetOnuSignalDegradeInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuSignalsFailInd:
+		log.Infow("Received onu signal fail indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuSignalsFailIndication(alarmInd.GetOnuSignalsFailInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuStartupFailInd:
+		log.Infow("Received onu startup fail indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuStartupFailedIndication(alarmInd.GetOnuStartupFailInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuTiwiInd:
+		log.Infow("Received onu transmission warning indication ", log.Fields{"alarm_ind": alarmInd})
+		log.Infow("Not implemented yet", log.Fields{"alarm_ind": "Onu-Transmission-indication"})
+	case *oop.AlarmIndication_OnuLossOfSyncFailInd:
+		log.Infow("Received onu Loss of Sync Fail indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuLossOfSyncIndication(alarmInd.GetOnuLossOfSyncFailInd(), deviceID, raisedTs)
+	case *oop.AlarmIndication_OnuItuPonStatsInd:
+		log.Infow("Received onu Itu Pon Stats indication ", log.Fields{"alarm_ind": alarmInd})
+		log.Infow("Not implemented yet", log.Fields{"alarm_ind": alarmInd})
+	case *oop.AlarmIndication_OnuDeactivationFailureInd:
+		log.Infow("Received onu deactivation failure indication ", log.Fields{"alarm_ind": alarmInd})
+		err = em.onuDeactivationFailureIndication(alarmInd.GetOnuDeactivationFailureInd(), deviceID, raisedTs)
+	default:
+		err = NewErrInvalidValue(log.Fields{"indication-type": alarmInd}, nil)
+	}
+	if err != nil {
+		return NewErrCommunication("publish-message", log.Fields{"indication-type": alarmInd}, err).Log()
+	}
+	return nil
+}
+
+// oltUpDownIndication handles Up and Down state of an OLT
+func (em *OpenOltEventMgr) oltUpDownIndication(oltIndication *oop.OltIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["oper-state"] = oltIndication.OperState
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if oltIndication.OperState == operationStateDown {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", oltIndicationDown, "RAISE_EVENT")
+	} else if oltIndication.OperState == operationStateUp {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", oltIndicationDown, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, olt, raisedTs); err != nil {
+		log.Errorw("Failed to send OLT event", log.Fields{"err": err})
+		return err
+	}
+	log.Infow("OLT UpDown event sent to KAFKA", log.Fields{})
+	return nil
+}
+
+// OnuDiscoveryIndication is an exported method to handle ONU discovery event
+func (em *OpenOltEventMgr) OnuDiscoveryIndication(onuDisc *oop.OnuDiscIndication, deviceID string, OnuID uint32, serialNumber string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["onu-id"] = strconv.FormatUint(uint64(OnuID), base10)
+	context["intf-id"] = strconv.FormatUint(uint64(onuDisc.IntfId), base10)
+	context["serial-number"] = serialNumber
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	de.DeviceEventName = fmt.Sprintf("%s_%s", onuDiscoveryEvent, "RAISE_EVENT")
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, equipment, pon, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU discovery event", log.Fields{"serial-number": serialNumber, "intf-id": onuDisc.IntfId})
+		return err
+	}
+	log.Infow("ONU discovery event sent to KAFKA", log.Fields{"serial-number": serialNumber, "intf-id": onuDisc.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) oltLosIndication(oltLos *oop.LosIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["intf-id"] = strconv.FormatUint(uint64(oltLos.IntfId), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if oltLos.Status == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", oltLosEvent, "RAISE_EVENT")
+	} else {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", oltLosEvent, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, olt, raisedTs); err != nil {
+		log.Errorw("Failed to send OLT loss of signal event", log.Fields{"intf-id": oltLos.IntfId})
+		return err
+	}
+	log.Infow("OLT LOS event sent to KAFKA", log.Fields{"intf-id": oltLos.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuDyingGaspIndication(dgi *oop.DyingGaspIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	var serialNumber string
+	context := make(map[string]string)
+	/* Populating event context */
+	serialNumber = ""
+	onu := em.handler.formOnuKey(dgi.IntfId, dgi.OnuId)
+	if onu, ok := em.handler.onus.Load(onu); ok {
+		serialNumber = onu.(*OnuDevice).serialNumber
+	}
+	context["serial-number"] = serialNumber
+	context["intf-id"] = strconv.FormatUint(uint64(dgi.IntfId), base10)
+	context["onu-id"] = strconv.FormatUint(uint64(dgi.OnuId), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	de.DeviceEventName = fmt.Sprintf("%s_%s", onuDyingGaspEvent, "EVENT")
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, pon, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU Dying gasp event", log.Fields{"intf-id": dgi.IntfId, "onu-id": dgi.OnuId})
+		return err
+	}
+	log.Infow("ONU dying gasp event sent to KAFKA", log.Fields{"intf-id": dgi.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuAlarmIndication(onuAlarm *oop.OnuAlarmIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["intf-id"] = strconv.FormatUint(uint64(onuAlarm.IntfId), base10)
+	context["onu-id"] = strconv.FormatUint(uint64(onuAlarm.OnuId), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if onuAlarm.LosStatus == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLosEvent, "RAISE_EVENT")
+	} else if onuAlarm.LosStatus == statusCheckOff {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLosEvent, "CLEAR_EVENT")
+	} else if onuAlarm.LobStatus == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLobEvent, "RAISE_EVENT")
+	} else if onuAlarm.LobStatus == statusCheckOff {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLobEvent, "CLEAR_EVENT")
+	} else if onuAlarm.LopcMissStatus == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLopcMissEvent, "RAISE_EVENT")
+	} else if onuAlarm.LopcMissStatus == statusCheckOff {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLopcMissEvent, "CLEAR_EVENT")
+	} else if onuAlarm.LopcMicErrorStatus == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLopcMicErrorEvent, "RAISE_EVENT")
+	} else if onuAlarm.LopcMicErrorStatus == statusCheckOff {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLopcMicErrorEvent, "CLEAR_EVENT")
+	} else if onuAlarm.LofiStatus == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLossOfFrameEvent, "RAISE_EVENT")
+	} else if onuAlarm.LofiStatus == statusCheckOff {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLossOfFrameEvent, "CLEAR_EVENT")
+	} else if onuAlarm.LoamiStatus == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLossOfPloamEvent, "RAISE_EVENT")
+	} else if onuAlarm.LoamiStatus == statusCheckOff {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLossOfPloamEvent, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, onu, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU Los event", log.Fields{"onu-id": onuAlarm.OnuId, "intf-id": onuAlarm.IntfId})
+		return err
+	}
+	log.Infow("ONU LOS event sent to KAFKA", log.Fields{"onu-id": onuAlarm.OnuId, "intf-id": onuAlarm.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuActivationFailIndication(oaf *oop.OnuActivationFailureIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["intf-id"] = strconv.FormatUint(uint64(oaf.IntfId), base10)
+	context["onu-id"] = strconv.FormatUint(uint64(oaf.OnuId), base10)
+	context["fail-reason"] = strconv.FormatUint(uint64(oaf.FailReason), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	de.DeviceEventName = fmt.Sprintf("%s_%s", onuActivationFailEvent, "RAISE_EVENT")
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, equipment, pon, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU activation failure event", log.Fields{"onu-id": oaf.OnuId, "intf-id": oaf.IntfId})
+		return err
+	}
+	log.Infow("ONU activation failure event sent to KAFKA", log.Fields{"onu-id": oaf.OnuId, "intf-id": oaf.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuLossOmciIndication(onuLossOmci *oop.OnuLossOfOmciChannelIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["intf-id"] = strconv.FormatUint(uint64(onuLossOmci.IntfId), base10)
+	context["onu-id"] = strconv.FormatUint(uint64(onuLossOmci.OnuId), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if onuLossOmci.Status == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLossOmciEvent, "RAISE_EVENT")
+	} else {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLossOmciEvent, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, pon, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU loss of OMCI channel event", log.Fields{"onu-id": onuLossOmci.OnuId, "intf-id": onuLossOmci.IntfId})
+		return err
+	}
+	log.Infow("ONU loss of OMCI channel event sent to KAFKA", log.Fields{"onu-id": onuLossOmci.OnuId, "intf-id": onuLossOmci.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuDriftOfWindowIndication(onuDriftWindow *oop.OnuDriftOfWindowIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["intf-id"] = strconv.FormatUint(uint64(onuDriftWindow.IntfId), base10)
+	context["onu-id"] = strconv.FormatUint(uint64(onuDriftWindow.OnuId), base10)
+	context["drift"] = strconv.FormatUint(uint64(onuDriftWindow.Drift), base10)
+	context["new-eqd"] = strconv.FormatUint(uint64(onuDriftWindow.NewEqd), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if onuDriftWindow.Status == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuDriftOfWindowEvent, "RAISE_EVENT")
+	} else {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuDriftOfWindowEvent, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, pon, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU drift of window event", log.Fields{"onu-id": onuDriftWindow.OnuId, "intf-id": onuDriftWindow.IntfId})
+		return err
+	}
+	log.Infow("ONU drift of window event sent to KAFKA", log.Fields{"onu-id": onuDriftWindow.OnuId, "intf-id": onuDriftWindow.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuSignalDegradeIndication(onuSignalDegrade *oop.OnuSignalDegradeIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["intf-id"] = strconv.FormatUint(uint64(onuSignalDegrade.IntfId), base10)
+	context["onu-id"] = strconv.FormatUint(uint64(onuSignalDegrade.OnuId), base10)
+	context["inverse-bit-error-rate"] = strconv.FormatUint(uint64(onuSignalDegrade.InverseBitErrorRate), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if onuSignalDegrade.Status == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuSignalDegradeEvent, "RAISE_EVENT")
+	} else {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuSignalDegradeEvent, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, pon, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU signals degrade event", log.Fields{"onu-id": onuSignalDegrade.OnuId, "intf-id": onuSignalDegrade.IntfId})
+		return err
+	}
+	log.Infow("ONU signal degrade event sent to KAFKA", log.Fields{"onu-id": onuSignalDegrade.OnuId, "intf-id": onuSignalDegrade.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuSignalsFailIndication(onuSignalsFail *oop.OnuSignalsFailureIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["onu-id"] = strconv.FormatUint(uint64(onuSignalsFail.OnuId), base10)
+	context["intf-id"] = strconv.FormatUint(uint64(onuSignalsFail.IntfId), base10)
+	context["inverse-bit-error-rate"] = strconv.FormatUint(uint64(onuSignalsFail.InverseBitErrorRate), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if onuSignalsFail.Status == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuSignalsFailEvent, "RAISE_EVENT")
+	} else {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuSignalsFailEvent, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, pon, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU signals fail event", log.Fields{"onu-id": onuSignalsFail.OnuId, "intf-id": onuSignalsFail.IntfId})
+		return err
+	}
+	log.Infow("ONU signals fail event sent to KAFKA", log.Fields{"onu-id": onuSignalsFail.OnuId, "intf-id": onuSignalsFail.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuStartupFailedIndication(onuStartupFail *oop.OnuStartupFailureIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["onu-id"] = strconv.FormatUint(uint64(onuStartupFail.OnuId), base10)
+	context["intf-id"] = strconv.FormatUint(uint64(onuStartupFail.IntfId), base10)
+
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if onuStartupFail.Status == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuStartupFailEvent, "RAISE_EVENT")
+	} else {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuStartupFailEvent, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, pon, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU startup fail event", log.Fields{"onu-id": onuStartupFail.OnuId, "intf-id": onuStartupFail.IntfId})
+		return err
+	}
+	log.Infow("ONU startup fail event sent to KAFKA", log.Fields{"onu-id": onuStartupFail.OnuId, "intf-id": onuStartupFail.IntfId})
+	return nil
+}
+
+func (em *OpenOltEventMgr) onuLossOfSyncIndication(onuLOKI *oop.OnuLossOfKeySyncFailureIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["onu-id"] = strconv.FormatUint(uint64(onuLOKI.OnuId), base10)
+	context["intf-id"] = strconv.FormatUint(uint64(onuLOKI.IntfId), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	if onuLOKI.Status == statusCheckOn {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLossOfKeySyncEvent, "RAISE_EVENT")
+	} else {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", onuLossOfKeySyncEvent, "CLEAR_EVENT")
+	}
+
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, security, onu, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU loss of key sync event", log.Fields{"onu-id": onuLOKI.OnuId, "intf-id": onuLOKI.IntfId})
+		return err
+	}
+	log.Infow("ONU loss of key sync event sent to KAFKA", log.Fields{"onu-id": onuLOKI.OnuId, "intf-id": onuLOKI.IntfId})
+	return nil
+}
+
+// oltIntfOperIndication handles Up and Down state of an OLT PON ports
+func (em *OpenOltEventMgr) oltIntfOperIndication(ifindication *oop.IntfOperIndication, deviceID string, raisedTs int64) {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	portID := IntfIDToPortNo(ifindication.IntfId, voltha.Port_PON_OLT)
+	device, err := em.handler.coreProxy.GetDevice(ctx.Background(), deviceID, deviceID)
+	if err != nil {
+		log.Errorw("Error while fetching Device object", log.Fields{"DeviceId": deviceID})
+	}
+	for _, port := range device.Ports {
+		if port.PortNo == portID {
+			// Events are suppressed if the Port Adminstate is not enabled.
+			if port.AdminState != common.AdminState_ENABLED {
+				log.Infow("Port disable/enable event not generated because, The port is not enabled by operator", log.Fields{"deviceId": deviceID, "port": port})
+				return
+			}
+			break
+		}
+	}
+	/* Populating event context */
+	context["oper-state"] = ifindication.GetOperState()
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+
+	if ifindication.GetOperState() == operationStateDown {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", ponIntfDownIndiction, "RAISE_EVENT")
+	} else if ifindication.OperState == operationStateUp {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", ponIntfDownIndiction, "CLEAR_EVENT")
+	}
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, communication, olt, raisedTs); err != nil {
+		log.Errorw("failed-to-send-olt-intf-oper-status-event", log.Fields{"err": err})
+	}
+	log.Info("sent-olt-intf-oper-status-event-to-kafka")
+}
+
+func (em *OpenOltEventMgr) onuDeactivationFailureIndication(onuDFI *oop.OnuDeactivationFailureIndication, deviceID string, raisedTs int64) error {
+	var de voltha.DeviceEvent
+	context := make(map[string]string)
+	/* Populating event context */
+	context["onu-id"] = strconv.FormatUint(uint64(onuDFI.OnuId), base10)
+	context["intf-id"] = strconv.FormatUint(uint64(onuDFI.IntfId), base10)
+	context["failure-reason"] = strconv.FormatUint(uint64(onuDFI.FailReason), base10)
+	/* Populating device event body */
+	de.Context = context
+	de.ResourceId = deviceID
+	de.DeviceEventName = onuDeactivationFailureEvent
+
+	/* Send event to KAFKA */
+	if err := em.eventProxy.SendDeviceEvent(&de, equipment, onu, raisedTs); err != nil {
+		log.Errorw("Failed to send ONU deactivation failure event", log.Fields{"onu-id": onuDFI.OnuId, "intf-id": onuDFI.IntfId})
+		return err
+	}
+	log.Infow("ONU deactivation failure event sent to KAFKA", log.Fields{"onu-id": onuDFI.OnuId, "intf-id": onuDFI.IntfId})
+	return nil
+}