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+# OpenConfig support for Platform components
+
+# High Level Design Document
+#### Rev 0.1
+
+# Table of Contents
+  * [List of Tables](#list-of-tables)
+  * [1 Feature Overview](#1-feature-overview)
+  * [2 Functionality](#2-functionality)  
+  * [3 Design](#3-design)
+  * [4 Testing](#4-testing)
+  * [5 Limitations](#5-limitations)
+  * [6 Future Enhancements](#6-future-enhancements)
+  * [7 References](#7-references)
+
+# List of Tables
+  * [Table 1: Abbreviations](#table-1-abbreviations) 
+  * [Table 2: Component Basic Information Mapping](#component-basic-information-mapping) 
+  * [Table 3: Memory Information Mapping](#memory-information-mapping) 
+  * [Table 4: Temperature Information Mapping](#temperature-information-mapping) 
+  * [Table 5: Power Supply Information Mapping](#power-supply-information-mapping) 
+  * [Table 6: Fan Information Mapping](#fan-information-mapping) 
+  * [Table 7: CPU Information Mapping](#cpu-information-mapping) 
+  * [Table 8: Transceiver Information Mapping](#transceiver-information-mapping) 
+  * [Table 9: Component Type to DB Table Mapping](#component-type-to-db-table-mapping) 
+  * [Table 10: Transceiver Threshold Field Mapping](#334-transceiver-threshold-field-mapping) 
+
+# Revision
+| Rev |     Date    |       Author          | Change Description                |
+|:---:|:-----------:|:---------------------:|-----------------------------------|
+| 0.1 | 08/24/2025  | Anukul Verma | Initial version                   |
+
+# About this Manual
+This document provides general information about the OpenConfig configuration/management of Platform components in SONiC corresponding to openconfig-platform.yang module and its sub-modules.
+
+# Scope
+- This document describes the high level design of OpenConfig configuration/management of Platform components via gNMI/REST in SONiC.
+- This does not cover the SONiC KLISH CLI.
+- Openconfig-platform.yang version latest from openconfig yang repo is considered.
+- Currently only EEPROM component is supported using Custom app approach (pfm_app.go). New implementation will be done using common app approach.
+- Supported attributes in OpenConfig YANG tree:
+```
+module: openconfig-platform
+  +--rw components
+     +--rw component* [name]
+        +--rw name                   -> ../config/name
+        +--rw config
+        |  +--rw name?   string
+        +--ro state
+        |  +--ro name?               string
+        |  +--ro type?               union
+        |  x--ro id?                 string
+        |  x--ro location?           string
+        |  +--ro description?        string
+        |  +--ro mfg-name?           string
+        |  +--ro mfg-date?           oc-yang:date
+        |  +--ro hardware-version?   string
+        |  +--ro serial-no?          string
+        |  +--ro part-no?            string
+        |  +--ro model-name          string
+        |  +--ro removable?          boolean
+        |  +--ro oper-status?        identityref
+        |  +--ro empty?              boolean
+        |  +--ro parent?             -> ../../../component/config/name
+        |  +--ro temperature
+        |  |  +--ro instant?           decimal64
+        |  |  +--ro min?               decimal64
+        |  |  +--ro max?               decimal64
+        |  |  +--ro alarm-status?      boolean
+        |  |  +--ro alarm-threshold?   uint32
+        |  +--ro memory
+        |     +--ro available?   uint64
+        |     +--ro utilized?    uint64
+        +--rw power-supply
+        |  +--ro state
+        |     +--ro oc-platform-psu:enabled?    boolean
+        |     +--ro oc-platform-psu:capacity?   oc-types:ieeefloat32
+        +--rw fan
+        |  +--ro state
+        |     +--ro oc-fan:speed?   uint32
+        +--rw cpu
+        |  +--rw config
+        |  +--ro state
+        |  +--rw oc-cpu:utilization
+        |     +--ro oc-cpu:state
+        |        +--ro oc-cpu:instant?    oc-types:percentage
+        |        +--ro oc-cpu:avg?        oc-types:percentage
+        |        +--ro oc-cpu:min?        oc-types:percentage
+        |        +--ro oc-cpu:max?        oc-types:percentage
+        |        +--ro oc-cpu:interval?   oc-types:stat-interval
+        +--rw oc-transceiver:transceiver
+           +--ro oc-transceiver:state
+           |  +--ro oc-transceiver:enabled?               boolean
+           |  +--ro oc-transceiver:form-factor-preconf?   identityref
+           |  +--ro oc-transceiver:present?               enumeration
+           |  +--ro oc-transceiver:form-factor?           identityref
+           |  +--ro oc-transceiver:connector-type?        identityref
+           |  +--ro oc-transceiver:vendor-rev?            string
+           |  +--ro oc-transceiver:serial-no?             string
+           |  +--ro oc-transceiver:date-code?             oc-yang:date-and-time
+           |  +--ro oc-transceiver:supply-voltage
+           |     +--ro oc-transceiver:instant?    decimal64
+           |     +--ro oc-transceiver:avg?        decimal64
+           |     +--ro oc-transceiver:min?        decimal64
+           |     +--ro oc-transceiver:max?        decimal64
+           |     +--ro oc-transceiver:interval?   oc-types:stat-interval
+           |     +--ro oc-transceiver:min-time?   oc-types:timeticks64
+           |     +--ro oc-transceiver:max-time?   oc-types:timeticks64
+           +--rw oc-transceiver:physical-channels
+           |  +--rw oc-transceiver:channel* [index]
+           |     +--rw oc-transceiver:index     -> ../config/index
+           |     +--ro oc-transceiver:state
+           |        +--ro oc-transceiver:index?                        uint16
+           |        +--ro oc-transceiver:associated-optical-channel?   -> /oc-platform:components/component/name
+           |        +--ro oc-transceiver:description?                  string
+           |        +--ro oc-transceiver:tx-laser?                     boolean
+           |        +--ro oc-transceiver:target-output-power?          decimal64
+           |        +--ro oc-transceiver:output-power
+           |        |  +--ro oc-transceiver:instant?   decimal64
+           |        +--ro oc-transceiver:input-power
+           |        |  +--ro oc-transceiver:instant?   decimal64
+           |        +--ro oc-transceiver:laser-bias-current
+           |           +--ro oc-transceiver:instant?   decimal64
+           +--rw oc-transceiver:thresholds
+              +--ro oc-transceiver:threshold* [severity]
+                 +--ro oc-transceiver:severity    -> ../state/severity
+                 +--ro oc-transceiver:state
+                    +--ro oc-transceiver:severity?                   identityref
+                    +--ro oc-transceiver:laser-temperature-upper?    decimal64
+                    +--ro oc-transceiver:laser-temperature-lower?    decimal64
+                    +--ro oc-transceiver:output-power-upper?         decimal64
+                    +--ro oc-transceiver:output-power-lower?         decimal64
+                    +--ro oc-transceiver:input-power-upper?          decimal64
+                    +--ro oc-transceiver:input-power-lower?          decimal64
+                    +--ro oc-transceiver:laser-bias-current-upper?   decimal64
+                    +--ro oc-transceiver:laser-bias-current-lower?   decimal64
+                    +--ro oc-transceiver:supply-voltage-upper?       decimal64
+                    +--ro oc-transceiver:supply-voltage-lower?       decimal64
+                    +--ro oc-transceiver:module-temperature-lower?   decimal64
+                    +--ro oc-transceiver:module-temperature-upper?   decimal64
+```
+
+# Definition/Abbreviation
+### Table 1: Abbreviations
+
+| **Term**                 | **Definition**                         |
+|--------------------------|-------------------------------------|
+| YANG                     | Yet Another Next Generation: modular language representing data structures in an XML tree format        |
+| gNMI                     | gRPC Network Management Interface: used to retrieve or manipulate the state of a device via telemetry or configuration data         |
+| PSU                      | Power Supply Unit |
+| DOM                      | Digital Optical Monitoring |
+| EEPROM                   | Electrically Erasable Programmable Read-Only Memory |
+
+# 1 Feature Overview
+## 1.1 Requirements
+### 1.1.1 Functional Requirements
+1. Provide support for OpenConfig Platform YANG models.
+2. Implement transformer support for Openconfig platform model to have following supports:  
+    Configure/Set Platform component attributes.  
+    Subscribe Platform component attributes for telemetry.
+3. Add support for following Platform component types:
+    * chassis
+    * cpu
+    * eeprom (System EEPROM)
+    * memory (Physical, Buffer, Swap, Cached, Virtual, Shared)
+    * disk
+    * power-supply (PSU)
+    * fan
+    * fantray
+    * temperature
+    * transceiver
+4. Support for platform component state information including:
+    * Basic component information (name, type, description, manufacturer, etc.)
+    * Operational status and health monitoring
+    * Temperature monitoring with thresholds and alarm status
+    * Memory utilization statistics
+    * CPU utilization statistics
+    * Power supply capacity and status
+    * Fan speed monitoring
+    * Transceiver information and DOM (Digital Optical Monitoring) data
+
+### 1.1.2 Configuration and Management Requirements
+The Platform configuration/management can be done via REST and gNMI. The implementation will return an error if configuration is not allowed due to misconfiguration or un-supported node is accessed.
+
+### 1.1.3 Scalability Requirements
+The maximum number of components depends on the hardware platform capabilities and the number of physical components present in the system.
+
+## 1.2 Design Overview
+### 1.2.1 Basic Approach
+SONiC already supports framework for Get, Patch and Delete via REST and gNMI. This feature adds support for OpenConfig based YANG models using transformer based implementation for Platform features.
+
+### 1.2.2 Container
+The code changes for this feature are part of *Management Framework* container which includes the REST server and *gnmi* container for gNMI support in *sonic-mgmt-common* repository.
+
+# 2 Functionality
+## 2.1 Target Deployment Use Cases
+1. REST client through which the user can perform GET operations on the supported YANG paths.
+2. gNMI client with support for capabilities, get and subscribe based on the supported YANG models.
+3. Platform monitoring and health management through standardized OpenConfig interfaces.
+4. Integration with network management systems for comprehensive platform visibility.
+
+# 3 Design
+## 3.1 Overview
+This HLD design is in line with the [Management Framework HLD](https://github.com/sonic-net/SONiC/blob/master/doc/mgmt/Management%20Framework.md)
+
+## 3.2 DB Changes
+### 3.2.1 CONFIG DB
+There are no changes to CONFIG DB schema definition.
+
+### 3.2.2 APP DB
+There are no changes to APP DB schema definition.
+
+### 3.2.3 STATE DB
+The following existing STATE DB tables are utilized for platform component information:
+- EEPROM_INFO
+- MEMORY_STATS
+- PHYSICAL_ENTITY_INFO
+- TEMPERATURE_INFO
+- TRANSCEIVER_INFO
+- TRANSCEIVER_DOM_THRESHOLD
+- TRANSCEIVER_DOM_SENSOR
+- MOUNT_POINTS
+- PSU_INFO
+- FAN_INFO
+- FAN_DRAWER_INFO
+- CHASSIS_INFO
+- CPU_STATS (new table will be added to support this)
+
+### 3.2.4 ASIC DB
+There are no changes to ASIC DB schema definition.
+
+### 3.2.5 COUNTER DB
+There are no changes to COUNTER DB schema definition.
+
+## 3.3 User Interface
+### 3.3.1 Data Models
+Openconfig-platform.yang and its submodules will be used as user interfacing models:
+- openconfig-platform.yang
+- openconfig-platform-psu.yang
+- openconfig-platform-fan.yang
+- openconfig-platform-transceiver.yang
+- openconfig-platform-cpu.yang
+- openconfig-platform-common.yang
+- openconfig-platform-types.yang
+- openconfig-platform-annotation.yang
+- openconfig-platform-deviation.yang
+- openconfig-platform-ext.yang
+
+### 3.3.2 Database Table and Field Mapping
+The following sections provide detailed mapping between OpenConfig YANG paths and SONiC STATE DB tables and fields for each component type.
+
+#### 3.3.2.1 Chassis Component Mapping
+**Database Table:** CHASSIS_INFO  
+**Key Pattern:** "chassis *" (e.g., "chassis 1")  
+**Component Type:** openconfig-platform-types:CHASSIS
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/type` | - | - | Fixed: CHASSIS |
+| `/components/component/state/description` | - | - | Static description |
+| `/components/component/state/serial-no` | CHASSIS_INFO | serial |
+| `/components/component/state/hardware-version` | CHASSIS_INFO | revision |
+| `/components/component/state/oper-status` | - | - | Fixed: ACTIVE |
+| `/components/component/state/empty` | - | - | Fixed: false |
+| `/components/component/state/removable` | - | - | Fixed: false |
+| `/components/component/state/model-name` | CHASSIS_INFO | model |
+
+#### 3.3.2.2 CPU Component Mapping  
+**Database Table:** CPU_STATS  
+**Key Pattern:** "CPU*" (e.g., "CPU0")  
+**Component Type:** openconfig-platform-types:CPU
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/type` | - | - | Fixed: CPU |
+| `/components/component/state/description` | - | - | Static description |
+| `/components/component/state/model-name` | CPU_STATS | model_name | CPU model information |
+| `/components/component/state/oper-status` | - | - | Fixed: ACTIVE |
+| `/components/component/state/empty` | - | - | Fixed: false |
+| `/components/component/state/removable` | - | - | Fixed: false |
+| `/components/component/cpu/utilization/state/instant` | CPU_STATS | load | Current CPU load |
+| `/components/component/cpu/utilization/state/avg` | CPU_STATS | load | Calculated average |
+| `/components/component/cpu/utilization/state/min` | CPU_STATS | load | Calculated minimum |
+| `/components/component/cpu/utilization/state/max` | CPU_STATS | load | Calculated maximum |
+
+#### 3.3.2.3 EEPROM Component Mapping
+**Database Table:** EEPROM_INFO  
+**Key Pattern:** "System Eeprom"  
+**Component Type:** openconfig-platform-types:STORAGE
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/id` | - | - | Fixed: "System Eeprom" |
+| `/components/component/state/name` | - | - | Same as id |
+| `/components/component/state/type` | - | - | Fixed: STORAGE |
+| `/components/component/state/description` | - | - | Static description |
+| `/components/component/state/part-no` | EEPROM_INFO | 0x22 | Product part number |
+| `/components/component/state/serial-no` | EEPROM_INFO | 0x23 | Serial number |
+| `/components/component/state/mfg-date` | EEPROM_INFO | 0x25 | Manufacturing date |
+| `/components/component/state/hardware-version` | EEPROM_INFO | 0x27 | Hardware revision |
+| `/components/component/state/mfg-name` | EEPROM_INFO | 0x2b | Manufacturer name |
+| `/components/component/state/parent` | PHYSICAL_ENTITY_INFO | parent_name | Usually chassis |
+| `/components/component/state/location` | PHYSICAL_ENTITY_INFO | parent_name | Location information |
+| `/components/component/state/oper-status` | - | - | Fixed: ACTIVE |
+| `/components/component/state/empty` | - | - | Fixed: false |
+| `/components/component/state/removable` | - | - | Fixed: false |
+
+#### 3.3.2.4 Memory Component Mapping
+**Database Table:** MEMORY_STATS  
+**Key Patterns:** "*Memory" (e.g., "Physical Memory", "Buffer Memory", "Swap Memory", "Cached Memory", "Virtual Memory", "Shared Memory")  
+**Component Type:** openconfig-platform-types:STORAGE
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/id` | - | Component key | Generated from memory key |
+| `/components/component/state/name` | - | Component key | Same as id |
+| `/components/component/state/type` | - | - | Fixed: STORAGE |
+| `/components/component/state/description` | - | - | Memory type description |
+| `/components/component/state/oper-status` | - | - | Fixed: ACTIVE |
+| `/components/component/state/empty` | - | - | Fixed: false |
+| `/components/component/state/removable` | - | - | Fixed: false |
+| `/components/component/state/memory/available` | MEMORY_STATS | 1K-blocks | Available memory in bytes |
+| `/components/component/state/memory/utilized` | MEMORY_STATS | Used | Used memory in bytes |
+
+#### 3.3.2.5 Disk Component Mapping
+**Database Table:** MOUNT_POINTS  
+**Key Pattern:** "/" (root filesystem)  
+**Component Type:** openconfig-platform-types:STORAGE
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/id` | - | - | Fixed: "Disk" |
+| `/components/component/state/name` | - | - | Same as id |
+| `/components/component/state/type` | - | - | Fixed: STORAGE |
+| `/components/component/state/description` | - | - | Static description |
+| `/components/component/state/oper-status` | - | - | Fixed: ACTIVE |
+| `/components/component/state/empty` | - | - | Fixed: false |
+| `/components/component/state/removable` | - | - | Fixed: false |
+| `/components/component/state/memory/available` | MOUNT_POINTS | 1K-blocks | Available disk space |
+| `/components/component/state/memory/utilized` | MOUNT_POINTS | Used | Used disk space |
+
+#### 3.3.2.6 Power Supply (PSU) Component Mapping
+**Database Table:** PSU_INFO  
+**Key Pattern:** "PSU *" (e.g., "PSU 1", "PSU 2")  
+**Component Type:** openconfig-platform-types:POWER_SUPPLY
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/name` | - | Component key | Name |
+| `/components/component/state/type` | - | - | Fixed: POWER_SUPPLY |
+| `/components/component/state/description` | - | - | PSU description |
+| `/components/component/state/parent` | PHYSICAL_ENTITY_INFO | parent_name | Usually chassis |
+| `/components/component/state/location` | PHYSICAL_ENTITY_INFO | position_in_parent | Location information |
+| `/components/component/state/oper-status` | PSU_INFO | status | Operational status |
+| `/components/component/state/empty` | - | - | Calculated from status |
+| `/components/component/state/removable` | - | - | Fixed: true |
+| `/components/component/power-supply/state/capacity` | PSU_INFO | max_power | Maximum power capacity |
+| `/components/component/power-supply/state/enabled` | PSU_INFO | status | PSU enabled status |
+
+#### 3.3.2.7 Fan Component Mapping
+**Database Table:** FAN_INFO  
+**Key Pattern:** "*fan*" (e.g., "fan1", "PSU1.fan1")  
+**Component Type:** openconfig-platform-types:FAN
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/name` | - | Component key | Name |
+| `/components/component/state/type` | - | - | Fixed: FAN |
+| `/components/component/state/description` | - | - | Fan description |
+| `/components/component/state/parent` | PHYSICAL_ENTITY_INFO | parent_name | Parent component |
+| `/components/component/state/location` | PHYSICAL_ENTITY_INFO | position_in_parent | Location information |
+| `/components/component/state/oper-status` | FAN_INFO | status | Operational status |
+| `/components/component/state/empty` | - | - | Calculated from status |
+| `/components/component/state/removable` | - | - | Fixed: true |
+| `/components/component/fan/state/speed` | FAN_INFO | speed | Fan speed in RPM |
+
+#### 3.3.2.8 Fan Tray Component Mapping
+**Database Table:** FAN_DRAWER_INFO  
+**Key Pattern:** "fantray*" (e.g., "fantray1", "fantray2")  
+**Component Type:** openconfig-platform-types:FAN
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/name` | - | Component key | Name |
+| `/components/component/state/type` | - | - | Fixed: FANTRAY |
+| `/components/component/state/description` | - | - | Fan tray description |
+| `/components/component/state/parent` | PHYSICAL_ENTITY_INFO | parent_name | Usually chassis |
+| `/components/component/state/location` | PHYSICAL_ENTITY_INFO | position_in_parent | Location information |
+| `/components/component/state/oper-status` | FAN_DRAWER_INFO | status | Operational status |
+| `/components/component/state/empty` | - | - | Calculated from status |
+| `/components/component/state/removable` | - | - | Fixed: true |
+
+#### 3.3.2.9 Temperature Component Mapping
+**Database Table:** TEMPERATURE_INFO  
+**Key Pattern:** Various sensor names (e.g., "temp1", "cpu-thermal", "NPU0_TEMP_0")  
+**Component Type:** openconfig-platform-types:SENSOR
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/name` | - | Component key | Name |
+| `/components/component/state/type` | - | - | Fixed: SENSOR |
+| `/components/component/state/description` | - | - | Temperature sensor description |
+| `/components/component/state/parent` | PHYSICAL_ENTITY_INFO | parent_name | Parent component |
+| `/components/component/state/location` | PHYSICAL_ENTITY_INFO | position_in_parent | Location information |
+| `/components/component/state/oper-status` | - | - | Fixed: ACTIVE |
+| `/components/component/state/empty` | - | - | Fixed: false |
+| `/components/component/state/removable` | - | - | Fixed: false |
+| `/components/component/state/temperature/instant` | TEMPERATURE_INFO | temperature | Current temperature |
+| `/components/component/state/temperature/min` | TEMPERATURE_INFO | minimum_temperature | Minimum temperature |
+| `/components/component/state/temperature/max` | TEMPERATURE_INFO | maximum_temperature | Maximum temperature |
+| `/components/component/state/temperature/alarm-status` | TEMPERATURE_INFO | warning_status | Temperature alarm status |
+| `/components/component/state/temperature/alarm-threshold` | TEMPERATURE_INFO | critical_high_threshold | Critical threshold |
+
+#### 3.3.2.10 Transceiver Component Mapping
+**Database Tables:** TRANSCEIVER_INFO, TRANSCEIVER_DOM_SENSOR, TRANSCEIVER_DOM_THRESHOLD  
+**Key Pattern:** "Ethernet*" (e.g., "Ethernet0", "Ethernet1/1")  
+**Component Type:** openconfig-platform-types:TRANSCEIVER
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/components/component/state/name` | - | Component key | Name |
+| `/components/component/state/type` | - | - | Fixed: TRANSCEIVER |
+| `/components/component/state/description` | - | - | Transceiver description |
+| `/components/component/state/serial-no` | TRANSCEIVER_INFO | serial | Serial number |
+| `/components/component/state/hardware-version` | TRANSCEIVER_INFO | hardware_rev | Hardware revision |
+| `/components/component/state/mfg-name` | TRANSCEIVER_INFO | manufacturer | Manufacturer name |
+| `/components/component/state/model-name` | TRANSCEIVER_INFO | model | Model name |
+| `/components/component/state/parent` | PHYSICAL_ENTITY_INFO | parent_name | Parent component |
+| `/components/component/state/location` | PHYSICAL_ENTITY_INFO | position_in_parent | Location information |
+| `/components/component/state/oper-status` | TRANSCEIVER_INFO | presence | Operational status |
+| `/components/component/state/empty` | TRANSCEIVER_INFO | presence | Calculated from presence |
+| `/components/component/state/removable` | - | - | Fixed: true |
+
+##### Transceiver State Information
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/transceiver/state/enabled` | TRANSCEIVER_INFO | presence | Enabled status |
+| `/transceiver/state/form-factor-preconf` | TRANSCEIVER_INFO | ext_identifier | Pre-configured form factor |
+| `/transceiver/state/present` | TRANSCEIVER_INFO | presence | Presence status |
+| `/transceiver/state/form-factor` | TRANSCEIVER_INFO | ext_identifier | Current form factor |
+| `/transceiver/state/connector-type` | TRANSCEIVER_INFO | connector | Connector type |
+| `/transceiver/state/vendor-rev` | TRANSCEIVER_INFO | vendor_rev | Vendor revision |
+| `/transceiver/state/serial-no` | TRANSCEIVER_INFO | serial | Serial number |
+| `/transceiver/state/date-code` | TRANSCEIVER_INFO | vendor_date | Manufacturing date code |
+| `/transceiver/state/supply-voltage/instant` | TRANSCEIVER_DOM_SENSOR | voltage | Supply voltage |
+
+##### Transceiver Thresholds
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/output-power-upper` | TRANSCEIVER_DOM_THRESHOLD | txpowerhighwarning | TX power high warning |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/output-power-lower` | TRANSCEIVER_DOM_THRESHOLD | txpowerlowwarning | TX power low warning |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/output-power-upper` | TRANSCEIVER_DOM_THRESHOLD | txpowerhighalarm | TX power high alarm |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/output-power-lower` | TRANSCEIVER_DOM_THRESHOLD | txpowerlowalarm | TX power low alarm |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/input-power-upper` | TRANSCEIVER_DOM_THRESHOLD | rxpowerhighwarning | RX power high warning |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/input-power-lower` | TRANSCEIVER_DOM_THRESHOLD | rxpowerlowwarning | RX power low warning |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/input-power-upper` | TRANSCEIVER_DOM_THRESHOLD | rxpowerhighalarm | RX power high alarm |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/input-power-lower` | TRANSCEIVER_DOM_THRESHOLD | rxpowerlowalarm | RX power low alarm |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/laser-bias-current-upper` | TRANSCEIVER_DOM_THRESHOLD | txbiashighwarning | TX bias high warning |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/laser-bias-current-lower` | TRANSCEIVER_DOM_THRESHOLD | txbiaslowwarning | TX bias low warning |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/laser-bias-current-upper` | TRANSCEIVER_DOM_THRESHOLD | txbiashighalarm | TX bias high alarm |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/laser-bias-current-lower` | TRANSCEIVER_DOM_THRESHOLD | txbiaslowalarm | TX bias low alarm |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/supply-voltage-upper` | TRANSCEIVER_DOM_THRESHOLD | vcchighwarning | Voltage high warning |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/supply-voltage-lower` | TRANSCEIVER_DOM_THRESHOLD | vcclowwarning | Voltage low warning |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/supply-voltage-upper` | TRANSCEIVER_DOM_THRESHOLD | vcchighalarm | Voltage high alarm |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/supply-voltage-lower` | TRANSCEIVER_DOM_THRESHOLD | vcclowalarm | Voltage low alarm |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/module-temperature-upper` | TRANSCEIVER_DOM_THRESHOLD | temphighwarning | Temperature high warning |
+| `/transceiver/thresholds/threshold[severity=WARNING]/state/module-temperature-lower` | TRANSCEIVER_DOM_THRESHOLD | templowwarning | Temperature low warning |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/module-temperature-upper` | TRANSCEIVER_DOM_THRESHOLD | temphighalarm | Temperature high alarm |
+| `/transceiver/thresholds/threshold[severity=CRITICAL]/state/module-temperature-lower` | TRANSCEIVER_DOM_THRESHOLD | templowalarm | Temperature low alarm |
+
+##### Transceiver Physical Channels
+
+| OpenConfig YANG Path | SONiC DB Table | SONiC DB Field | Notes |
+|---------------------|----------------|----------------|--------|
+| `/transceiver/physical-channels/channel[index=N]/state/index` | - | - | Channel index (0-based) |
+| `/transceiver/physical-channels/channel[index=N]/state/description` | - | - | Channel description |
+| `/transceiver/physical-channels/channel[index=N]/state/input-power/instant` | TRANSCEIVER_DOM_SENSOR | rx{N}power | RX power for channel N |
+| `/transceiver/physical-channels/channel[index=N]/state/output-power/instant` | TRANSCEIVER_DOM_SENSOR | tx{N}power | TX power for channel N |
+| `/transceiver/physical-channels/channel[index=N]/state/laser-bias-current/instant` | TRANSCEIVER_DOM_SENSOR | tx{N}bias | TX bias current for channel N |
+
+### 3.3.4 REST API Support
+#### 3.3.4.1 GET Operations
+Supported at various levels:
+- Component list level: `/openconfig-platform:components`
+- Individual component level: `/openconfig-platform:components/component={name}`
+- Specific state information: `/openconfig-platform:components/component={name}/state/{leaf}`
+
+Sample GET output for chassis component:
+```json
+{
+  "openconfig-platform:component": [
+    {
+      "config": {
+        "name": "chassis 1"
+      },
+      "name": "chassis 1",
+      "state": {
+        "description": "Chassis component",
+        "empty": false,
+        "hardware-version": "0.20",
+        "model-name": "8102-64H-O",
+        "name": "chassis 1",
+        "oper-status": "openconfig-platform-types:ACTIVE",
+        "removable": false,
+        "serial-no": "CSNH5T5PHAE",
+        "type": "openconfig-platform-types:CHASSIS"
+      }
+    }
+  ]
+}
+
+```
+
+Sample GET output for CPU component with utilization:
+```json
+{
+  "openconfig-platform:component": [
+    {
+      "config": {
+        "name": "CPU0"
+      },
+      "cpu": {
+        "openconfig-platform-cpu:utilization": {
+          "state": {
+            "avg": 8,
+            "instant": 1,
+            "interval": "60000000000",
+            "max": 19,
+            "min": 1
+          }
+        }
+      },
+      "name": "CPU0",
+      "state": {
+        "description": "GenuineIntel: VXR",
+        "empty": false,
+        "mfg-name": "GenuineIntel",
+        "model-name": "VXR",
+        "name": "CPU0",
+        "oper-status": "openconfig-platform-types:ACTIVE",
+        "removable": false,
+        "type": "openconfig-platform-types:CPU"
+      }
+    }
+  ]
+}
+```
+
+Sample GET output for Memory component:
+```json
+{
+  "openconfig-platform:components/component": {
+    "openconfig-platform:component": [
+      {
+        "config": {
+          "name": "Physical Memory"
+        },
+        "name": "Physical Memory",
+        "state": {
+          "description": "Physical Memory",
+          "empty": false,
+          "memory": {
+            "available": "20014612",
+            "utilized": "6550668"
+          },
+          "name": "Physical Memory",
+          "oper-status": "openconfig-platform-types:ACTIVE",
+          "type": "openconfig-platform-types:STORAGE"
+        }
+      }
+    ]
+  }
+}
+```
+
+Sample GET output for PSU component:
+```json
+{
+  "openconfig-platform:component": [
+    {
+      "config": {
+        "name": "PSU 1"
+      },
+      "name": "PSU 1",
+      "power-supply": {
+        "state": {
+          "openconfig-platform-psu:enabled": false
+        }
+      },
+      "state": {
+        "description": "PSU 1",
+        "empty": true,
+        "location": "1",
+        "name": "PSU 1",
+        "oper-status": "openconfig-platform-types:ACTIVE",
+        "parent": "chassis 1",
+        "removable": true,
+        "type": "openconfig-platform-types:POWER_SUPPLY"
+      }
+    }
+  ]
+}
+```
+
+Sample GET output for Temperature sensor:
+```json
+{
+  "openconfig-platform:component": [
+    {
+      "config": {
+        "name": "NPU0_TEMP_0"
+      },
+      "name": "NPU0_TEMP_0",
+      "state": {
+        "description": "Temperature Sensor - NPU0_TEMP_0",
+        "empty": false,
+        "location": "23",
+        "name": "NPU0_TEMP_0",
+        "oper-status": "openconfig-platform-types:ACTIVE",
+        "parent": "chassis 1",
+        "removable": false,
+        "temperature": {
+          "alarm-status": false,
+          "alarm-threshold": 102,
+          "instant": "35",
+          "max": "35",
+          "min": "0"
+        },
+        "type": "openconfig-platform-types:SENSOR"
+      }
+    }
+  ]
+}
+```
+
+Sample GET output for Transceiver component:
+```json
+{
+  "openconfig-platform:component": [
+    {
+      "config": {
+        "name": "Ethernet0"
+      },
+      "name": "Ethernet0",
+      "openconfig-platform-transceiver:transceiver": {
+        "state": {
+          "date-code": "2017-08-27",
+          "enabled": true,
+          "form-factor": "openconfig-transport-types:QSFP28",
+          "form-factor-preconf": "openconfig-transport-types:QSFP28",
+          "present": "PRESENT",
+          "serial-no": "APF21340584-A",
+          "vendor-rev": "A"
+        },
+        "thresholds": {
+          "threshold": [
+            {
+              "severity": "openconfig-alarm-types:CRITICAL",
+              "state": {
+                "input-power-lower": "0",
+                "input-power-upper": "0",
+                "laser-bias-current-lower": "0",
+                "laser-bias-current-upper": "0",
+                "module-temperature-lower": "0",
+                "module-temperature-upper": "0",
+                "output-power-lower": "0",
+                "output-power-upper": "0",
+                "severity": "openconfig-alarm-types:CRITICAL",
+                "supply-voltage-lower": "0",
+                "supply-voltage-upper": "0"
+              }
+            },
+            {
+              "severity": "openconfig-alarm-types:WARNING",
+              "state": {
+                "input-power-lower": "0",
+                "input-power-upper": "0",
+                "laser-bias-current-lower": "0",
+                "laser-bias-current-upper": "0",
+                "module-temperature-lower": "0",
+                "module-temperature-upper": "0",
+                "output-power-lower": "0",
+                "output-power-upper": "0",
+                "severity": "openconfig-alarm-types:WARNING",
+                "supply-voltage-lower": "0",
+                "supply-voltage-upper": "0"
+              }
+            }
+          ]
+        }
+      },
+      "state": {
+        "description": "Transceiver Ethernet0 - Type: QSFP28 or later",
+        "empty": false,
+        "mfg-name": "CISCO-AMPHENOL",
+        "model-name": "NDAAFF-C401",
+        "name": "Ethernet0",
+        "oper-status": "openconfig-platform-types:ACTIVE",
+        "removable": true,
+        "serial-no": "APF21340584-A",
+        "type": "openconfig-platform-types:TRANSCEIVER"
+      }
+    }
+  ]
+}
+```
+
+### 3.3.5 gNMI Support
+#### 3.3.5.1 Capabilities
+The gNMI server exposes platform component capabilities through the standard capabilities RPC.
+
+#### 3.3.5.2 Get Operations
+Full support for gNMI Get operations on all supported platform component paths.
+
+#### 3.3.5.3 Subscribe Operations
+Support for gNMI Subscribe operations for real-time monitoring of:
+- Temperature readings
+- CPU utilization
+- Memory usage
+- Fan speeds
+- Power supply status
+- Transceiver DOM data
+
+- Example for Power supply oper-status subscribe on-change stream mode
+
+```json
+{
+  "source": "172.29.93.21:27117",
+  "subscription-name": "default-1758089936",
+  "timestamp": 1758089932057031339,
+  "time": "2025-09-17T11:48:52.057031339+05:30",
+  "prefix": "openconfig-platform:components/component[name=PSU 1]/state",
+  "target": "OC-YANG",
+  "updates": [
+    {
+      "Path": "oper-status",
+      "values": {
+        "oper-status": "INACTIVE"
+      }
+    }
+  ]
+}
+
+{
+  "sync-response": true
+}
+
+{
+  "source": "172.29.93.21:27117",
+  "subscription-name": "default-1758089936",
+  "timestamp": 1758089943763134718,
+  "time": "2025-09-17T11:49:03.763134718+05:30",
+  "prefix": "openconfig-platform:components/component[name=PSU 1]/state",
+  "target": "OC-YANG",
+  "updates": [
+    {
+      "Path": "oper-status",
+      "values": {
+        "oper-status": "ACTIVE"
+      }
+    }
+  ]
+}
+```
+## 3.4 Implementation Details
+### 3.4.1 Component Type Detection
+Component types are determined based on YANG key patterns:
+
+| Key Pattern | Component Type | Example Keys |
+|-------------|----------------|--------------|
+| "chassis *" | Chassis | "chassis 1" |
+| "CPU*" | CPU | "CPU0", "CPU1" |
+| "System Eeprom" | EEPROM | "System Eeprom" |
+| "*Memory" | Memory | "Physical Memory", "Buffer Memory", "Swap Memory", "Cached Memory", "Virtual Memory", "Shared Memory" |
+| "/" | Disk | "/dev/vda3" |
+| "PSU *" | PSU | "PSU 1", "PSU 2" |
+| "*fan*" | Fan | "fan1", "PSU1.fan1" |
+| "fantray*" | Fantray | "fantray1", "fantray2" |
+| "Ethernet*" | Transceiver | "Ethernet0", "Ethernet4" |
+| Others | Temperature | "temp1", "cpu-thermal", "NPU0_TEMP_0" |
+
+### 3.4.2 Error Handling
+- Graceful handling of missing components
+- Appropriate error responses for unsupported operations
+- Validation of component types and availability
+- Database connection error handling
+- Data conversion error handling
+
+# 4 Testing
+## 4.1 Unit Tests
+Comprehensive unit tests covering:
+- Individual component type functionality validation
+- Database interaction and data retrieval verification
+- Error condition handling and edge cases
+- Data transformation and format validation
+- Component type detection logic
+- OpenConfig YANG path mapping verification
+
+## 4.2 Integration Tests
+- REST API endpoint testing
+- gNMI operations validation
+- End-to-end platform monitoring scenarios
+
+# 5 Limitations
+1. Read-only operations - platform components are primarily for monitoring
+2. Platform-specific component availability depends on hardware support
+3. Real-time data accuracy depends on underlying platform drivers
+
+# 6 Future Enhancements
+1. Support for additional component types as they become available
+2. Configuration support for configurable platform components
+
+# 7 References
+1. [OpenConfig Platform YANG Models](https://github.com/openconfig/public/tree/master/release/models/platform)
+2. [SONiC Management Framework HLD](https://github.com/sonic-net/SONiC/blob/master/doc/mgmt/Management%20Framework.md)
+3. [OpenConfig gNMI Specification](https://github.com/openconfig/reference/blob/master/rpc/gnmi/gnmi-specification.md)