module openconfig-platform-transceiver {

    yang-version 1;

    namespace
      "http://openconfig.net/yang/platform/transceiver";

    prefix oc-transceiver;

    import ietf-yang-types {
      prefix yang;
    }
    import openconfig-platform {
      prefix oc-platform;
    }
    import openconfig-platform-types {
      prefix oc-platform-types;
    }
    import openconfig-platform-port {
      prefix oc-port;
    }
    import openconfig-interfaces {
      prefix oc-if;
    }
    import openconfig-transport-types {
      prefix oc-opt-types;
    }
    import openconfig-types {
      prefix oc-types;
    }
    import openconfig-extensions {
      prefix oc-ext;
    }
    import openconfig-yang-types {
      prefix oc-yang;
    }
    import openconfig-alarm-types {
      prefix oc-alarm-types;
    }

    organization "OpenConfig working group";

    contact
      "OpenConfig working group
    www.openconfig.net";

    description
      "This module defines configuration and operational state data
    for transceivers (i.e., pluggable optics).  The module should be
    used in conjunction with the platform model where other
    physical entity data are represented.

    In the platform model, a component of type=TRANSCEIVER is
    expected to be a subcomponent of a PORT component.  This
    module defines a concrete schema for the associated data for
    components with type=TRANSCEIVER.

    A transceiver will always contain physical-channel(s), however
    when a line side optical-channel is present (i.e. ZR+ optics)
    the physical-channel will reference its optical-channel.
    In this case, the optical-channels components must be
    subcomponents of the transceiver. The relationship between the
    physical-channel and the optical-channel allows for multiple
    optical-channels to be associated with a transceiver in addition
    to ensuring certain leaves (i.e. output-power) are not duplicated
    in multiple components.

    If a transceiver contains a digital signal processor (DSP), such
    as with ZR+ optics, the modeling will utilize hierarchical
    components as follows:
    PORT --> TRANSCEIVER --> OPTICAL_CHANNEL(s)
    The signal will then traverse through a series of
    terminal-device/logical-channels as required. The first
    logical-channel connected to the OPTICAL_CHANNEL will utilize the
    assignment/optical-channel leaf to create the relationship. At the
    conclusion of the series of logical-channels, the logical-channel
    will be associated to its host / client side based on:
    * If the TRANSCEIVER is directly within a router or switch, then
      it will use the logical-channel ingress leaf to specify the
      interface it is associated with.
    * If the TRANSCEIVER is within a dedicated terminal (Layer 1)
      device, then it will use the logical-channel ingress leaf to
      specify a physical-channel within a TRANSCEIVER component
      (i.e. gray optic) that it is associated with.";

    revision "2023-08-30" {
      description
        "Clarify transceiver module threshold for input-power.";
      reference
        "0.14.0";

    }

    revision "2023-08-30" {
      description
        "Add transceiver module temperature thresholds";
      reference
        "0.13.0";

    }

    revision "2023-06-27" {
      description
        "Add tx bias and voltage thresholds";
      reference
        "0.12.0";

    }

    revision "2023-05-03" {
      description
        "Increase max length of vendor-rev to 4.";
      reference
        "0.11.0";

    }

    revision "2023-02-10" {
      description "Fixing linting issues.";
      reference
        "0.10.1";

    }

    revision "2023-01-12" {
      description
        "Add laser power and temperature thresholds";
      reference
        "0.10.0";

    }

    revision "2021-07-29" {
      description
        "Add several media-lane-based VDM defined by CMIS to physical channel";
      reference
        "0.9.0";

    }

    revision "2021-02-23" {
      description
        "Add leafref to an optical channel from a physical channel.";
      reference
        "0.8.0";

    }

    revision "2020-05-06" {
      description
        "Ensure that when statements in read-write contexts reference
      only read-write leaves.";
      reference
        "0.7.1";

    }

    revision "2018-11-25" {
      description
        "Add augment for leafref to transceiver component;
      Correct paths in physical channels leafref.";
      reference
        "0.7.0";

    }

    revision "2018-11-21" {
      description
        "Add OpenConfig module metadata extensions.";
      reference
        "0.6.1";

    }

    revision "2018-11-16" {
      description
        "Added transceiver FEC configuration and state";
      reference
        "0.6.0";

    }

    revision "2018-05-15" {
      description
        "Remove internal-temp state leaf, since we prefer
      the generic /components/component/state/temperature
      container for temperature information.";
      reference
        "0.5.0";

    }

    revision "2018-01-22" {
      description
        "Fixed physical-channel path reference";
      reference
        "0.4.1";

    }

    revision "2017-09-18" {
      description
        "Use openconfig-yang-types module";
      reference
        "0.4.0";

    }

    revision "2017-07-08" {
      description
        "Adds clarification on aggregate power measurement data";
      reference
        "0.3.0";

    }

    revision "2016-12-22" {
      description
        "Adds preconfiguration data and clarified units";
      reference
        "0.2.0";

    }

    oc-ext:openconfig-version "0.14.0";
    oc-ext:regexp-posix;
    oc-ext:catalog-organization "openconfig";
    oc-ext:origin "openconfig";

    grouping optical-power-state {
      description
        "Reusable leaves related to optical power state -- these
      are read-only state values. If avg/min/max statistics are
      not supported, the target is expected to just supply the
      instant value";
      container output-power {
        description
          "The output optical power of a physical channel in units
        of 0.01dBm, which may be associated with individual
        physical channels, or an aggregate of multiple physical
        channels (i.e., for the overall transceiver). For an
        aggregate, this may be a measurement from a photodetector
        or a a calculation performed on the device by summing up
        all of the related individual physical channels.
        Values include the instantaneous, average, minimum, and
        maximum statistics. If avg/min/max statistics are not
        supported, the target is expected to just supply the
        instant value";
        uses oc-types:avg-min-max-instant-stats-precision2-dBm;
      }  // container output-power

      container input-power {
        description
          "The input optical power of a physical channel in units
        of 0.01dBm, which may be associated with individual
        physical channels, or an aggregate of multiple physical
        channels (i.e., for the overall transceiver). For an
        aggregate, this may be a measurement from a photodetector
        or a a calculation performed on the device by summing up
        all of the related individual physical channels.
        Values include the instantaneous, average, minimum, and
        maximum statistics. If avg/min/max statistics are not
        supported, the target is expected to just supply the
        instant value";
        uses oc-types:avg-min-max-instant-stats-precision2-dBm;
      }  // container input-power

      container laser-bias-current {
        description
          "The current applied by the system to the transmit laser to
        achieve the output power. The current is expressed in mA
        with up to two decimal precision. Values include the
        instantaneous, average, minimum, and maximum statistics.
        If avg/min/max statistics are not supported, the target is
        expected to just supply the instant value";
        uses oc-types:avg-min-max-instant-stats-precision2-mA;
      }  // container laser-bias-current
    }  // grouping optical-power-state

    grouping output-optical-frequency {
      description
        "Reusable leaves related to optical output power -- this is
      typically configurable on line side and read-only on the
      client-side";
      leaf output-frequency {
        type oc-opt-types:frequency-type;
        description
          "The frequency in MHz of the individual physical channel
        (e.g. ITU C50 - 195.0THz and would be reported as
        195,000,000 MHz in this model). This attribute is not
        configurable on most client ports.";
      }
    }  // grouping output-optical-frequency

    grouping physical-channel-config {
      description
        "Configuration data for physical client channels";
      leaf index {
        type uint16 {
          range "0..max";
        }
        description
          "Index of the physical channnel or lane within a physical
        client port";
      }

      leaf associated-optical-channel {
        type leafref {
          path "/oc-platform:components/oc-platform:component/oc-platform:name";
        }
        description
          "A physical channel may reference an optical channel
        component. If the physical channel does make this optional
        reference, then a limited set of leaves will apply within
        the physical channel to avoid duplication within the optical
        channel.";
      }

      leaf description {
        type string;
        description
          "Text description for the client physical channel";
      }

      leaf tx-laser {
        type boolean;
        description
          "Enable (true) or disable (false) the transmit label for the
        channel";
      }

      uses physical-channel-config-extended {
        when
          "../../../config/module-functional-type = 'oc-opt-types:TYPE_STANDARD_OPTIC'" {
          description
            "When the physical channel is of TYPE_STANDARD_OPTIC, the
          extended config will be used";
        }
      }
    }  // grouping physical-channel-config

    grouping physical-channel-config-extended {
      description
        "Extended configuration data for physical client channels
      for applications where the full physical channel config and
      state are used. In some cases, such as when the physical
      channel has a leafref to an optical channel component and the
      module-functional-type is TYPE_DIGITAL_COHERENT_OPTIC this
      grouping will NOT be used.";
      leaf target-output-power {
        type decimal64 {
          fraction-digits 2;
        }
        units "dBm";
        description
          "Target output optical power level of the optical channel,
        expressed in increments of 0.01 dBm (decibel-milliwats)";
      }
    }  // grouping physical-channel-config-extended

    grouping physical-channel-state {
      description
        "Operational state data for client channels. In some cases,
      such as when the physical channel has a leafref to an optical
      channel component and the module-functional-type is
      TYPE_DIGITAL_COHERENT_OPTIC this grouping will NOT be used.";
      leaf laser-age {
        type oc-types:percentage;
        description
          "Laser age (0% at beginning of life, 100% end of life) in integer
        percentage. This term is defined by Common Management Interface
        Specification (CMIS).";
        reference
          "QSFP-DD CMIS 5.0 Table 8-122";

      }

      container laser-temperature {
        description
          "Laser temperature for the cooled laser in degrees Celsius with 1
        decimal precision. This term is defined by Common Management
        Interface Specification (CMIS). Values include the instantaneous,
        average, minimum, and maximum statistics. If avg/min/max statistics
        are not supported, the target is expected to just supply the
        instant value.";
        reference
          "QSFP-DD CMIS 5.0 Table 8-122";

        uses oc-platform-types:avg-min-max-instant-stats-precision1-celsius;
      }  // container laser-temperature

      container target-frequency-deviation {
        description
          "The difference in MHz with 1 decimal precision between the target
        center frequency and the actual current center frequency . This term
        is defined by Common Management Interface Specification (CMIS) and
        referred to as laser frequency error or laser ferquency deviation.
        Values include the instantaneous, average, minimum, and maximum
        statistics. If avg/min/max statistics are not supported, the target
        is expected to just supply the instant value.";
        reference
          "QSFP-DD CMIS 5.0 Section Table 8-122";

        uses oc-opt-types:avg-min-max-instant-stats-precision1-mhz;
      }  // container target-frequency-deviation

      container tec-current {
        description
          "The amount of current flowing to the TC of a cooled laser in percentage
        with 2 decimal precision. This term is defined by Common Management
        Interface Specification (CMIS). Values include the instantaneous,
        average, minimum, and maximum statistics. If avg/min/max statistics
        are not supported, the target is expected to just supply the instant
        value.";
        reference
          "QSFP-DD CMIS 5.0 Table 8-122";

        uses oc-opt-types:avg-min-max-instant-stats-precision2-pct;
      }  // container tec-current

      uses physical-channel-state-extended {
        when
          "../../../state/module-functional-type = 'oc-opt-types:TYPE_STANDARD_OPTIC'" {
          description
            "When the physical channel is of TYPE_STANDARD_OPTIC, the
          extended state will be used";
        }
      }
    }  // grouping physical-channel-state

    grouping physical-channel-state-extended {
      description
        "Extended operational state data for physical client channels
      for applications where the full physical channel config and
      state are used. In some cases, such as when the physical
      channel has a leafref to an optical channel component and the
      module-functional-type is TYPE_DIGITAL_COHERENT_OPTIC this
      grouping will NOT be used.";
      uses output-optical-frequency;

      uses optical-power-state;
    }  // grouping physical-channel-state-extended

    grouping physical-channel-top {
      description
        "Top-level grouping for physical client channels";
      container physical-channels {
        description
          "Enclosing container for client channels";
        list channel {
          key "index";
          description
            "List of client channels, keyed by index within a physical
          client port.  A physical port with a single channel would
          have a single zero-indexed element";
          leaf index {
            type leafref {
              path "../config/index";
            }
            description
              "Reference to the index number of the channel";
          }

          container config {
            description
              "Configuration data for physical channels";
            uses physical-channel-config;
          }  // container config

          container state {
            config false;
            description
              "Operational state data for channels";
            uses physical-channel-config;

            uses physical-channel-state;
          }  // container state
        }  // list channel
      }  // container physical-channels
    }  // grouping physical-channel-top

    grouping transceiver-threshold-top {
      description
        "Top-level grouping for transceiver alarm thresholds for
      various sensors.";
      container thresholds {
        description
          "Enclosing container for transceiver alarm thresholds.";
        list threshold {
          key "severity";
          config false;
          description
            "List of transceiver alarm thresholds, indexed by
          alarm severity.";
          leaf severity {
            type leafref {
              path "../state/severity";
            }
            config false;
            description
              "The severity applied to the group of thresholds.
            An implementation's highest severity threshold
            should be mapped to OpenConfig's `CRITICAL`
            severity level.";
          }

          container state {
            config false;
            description
              "Operational alarm thresholds for the transceiver.";
            uses transceiver-threshold-state;
          }  // container state
        }  // list threshold
      }  // container thresholds
    }  // grouping transceiver-threshold-top

    grouping port-transceiver-config {
      description
        "Configuration data for client port transceivers";
      leaf enabled {
        type boolean;
        description
          "Turns power on / off to the transceiver -- provides a means
        to power on/off the transceiver (in the case of SFP, SFP+,
        QSFP,...) or enable high-power mode (in the case of CFP,
        CFP2, CFP4) and is optionally supported (device can choose to
        always enable).  True = power on / high power, False =
        powered off";
      }

      leaf form-factor-preconf {
        type identityref {
          base oc-opt-types:TRANSCEIVER_FORM_FACTOR_TYPE;
        }
        description
          "Indicates the type of optical transceiver used on this
        port.  If the client port is built into the device and not
        pluggable, then non-pluggable is the corresponding state. If
        a device port supports multiple form factors (e.g. QSFP28
        and QSFP+, then the value of the transceiver installed shall
        be reported. If no transceiver is present, then the value of
        the highest rate form factor shall be reported
        (QSFP28, for example).

        The form factor is included in configuration data to allow
        pre-configuring a device with the expected type of
        transceiver ahead of deployment.  The corresponding state
        leaf should reflect the actual transceiver type plugged into
        the system.";
      }

      leaf ethernet-pmd-preconf {
        type identityref {
          base oc-opt-types:ETHERNET_PMD_TYPE;
        }
        description
          "The Ethernet PMD is a property of the optical transceiver
        used on the port, indicating the type of physical connection.
        It is included in configuration data to allow pre-configuring
        a port/transceiver with the expected PMD.  The actual PMD is
        indicated by the ethernet-pmd state leaf.";
      }

      leaf fec-mode {
        type identityref {
          base oc-platform-types:FEC_MODE_TYPE;
        }
        description
          "The FEC mode indicates the mode of operation for the
        transceiver's FEC. This defines typical operational modes
        and does not aim to specify more granular FEC capabilities.";
      }

      leaf module-functional-type {
        type identityref {
          base oc-opt-types:TRANSCEIVER_MODULE_FUNCTIONAL_TYPE;
        }
        description
          "Indicates the module functional type which represents the
        functional capability of the transceiver. For example, this
        would specify the module is a digital coherent optic or a
        standard grey optic that performs on-off keying.";
      }
    }  // grouping port-transceiver-config

    grouping port-transceiver-state {
      description
        "Operational state data for client port transceivers";
      leaf present {
        type enumeration {
          enum "PRESENT" {
            value 0;
            description
              "Transceiver is present on the port";
          }
          enum "NOT_PRESENT" {
            value 1;
            description
              "Transceiver is not present on the port";
          }
        }
        description
          "Indicates whether a transceiver is present in
        the specified client port.";
      }

      leaf form-factor {
        type identityref {
          base oc-opt-types:TRANSCEIVER_FORM_FACTOR_TYPE;
        }
        description
          "Indicates the type of optical transceiver used on this
        port.  If the client port is built into the device and not
        pluggable, then non-pluggable is the corresponding state. If
        a device port supports multiple form factors (e.g. QSFP28
        and QSFP+, then the value of the transceiver installed shall
        be reported. If no transceiver is present, then the value of
        the highest rate form factor shall be reported
        (QSFP28, for example).";
      }

      leaf connector-type {
        type identityref {
          base oc-opt-types:FIBER_CONNECTOR_TYPE;
        }
        description
          "Connector type used on this port";
      }

      leaf vendor {
        type string {
          length "1..16";
        }
        description
          "Full name of transceiver vendor. 16-octet field that
        contains ASCII characters, left-aligned and padded on the
        right with ASCII spaces (20h)";
      }

      leaf vendor-part {
        type string {
          length "1..16";
        }
        description
          "Transceiver vendor's part number. 16-octet field that
        contains ASCII characters, left-aligned and padded on the
        right with ASCII spaces (20h). If part number is undefined,
        all 16 octets = 0h";
      }

      leaf vendor-rev {
        type string {
          length "1..4";
        }
        description
          "Transceiver vendor's revision number. Field of 1 to 4 octets that
        contains ASCII characters, left-aligned and padded on the
        right with ASCII spaces (20h)";
      }

      leaf ethernet-pmd {
        type identityref {
          base oc-opt-types:ETHERNET_PMD_TYPE;
        }
        description
          "Ethernet PMD (physical medium dependent sublayer) that the
        transceiver supports. The SFF/QSFP MSAs have registers for
        this and CFP MSA has similar.";
      }

      leaf sonet-sdh-compliance-code {
        type identityref {
          base oc-opt-types:SONET_APPLICATION_CODE;
        }
        description
          "SONET/SDH application code supported by the port";
      }

      leaf otn-compliance-code {
        type identityref {
          base oc-opt-types:OTN_APPLICATION_CODE;
        }
        description
          "OTN application code supported by the port";
      }

      leaf serial-no {
        type string {
          length "1..16";
        }
        description
          "Transceiver serial number. 16-octet field that contains
        ASCII characters, left-aligned and padded on the right with
        ASCII spaces (20h). If part serial number is undefined, all
        16 octets = 0h";
      }

      leaf date-code {
        type oc-yang:date-and-time;
        description
          "Representation of the transceiver date code, typically
        stored as YYMMDD.  The time portion of the value is
        undefined and not intended to be read.";
      }

      leaf fault-condition {
        type boolean;
        description
          "Indicates if a fault condition exists in the transceiver";
      }

      leaf fec-status {
        type identityref {
          base oc-platform-types:FEC_STATUS_TYPE;
        }
        description
          "Operational status of FEC";
      }

      leaf fec-uncorrectable-blocks {
        type yang:counter64;
        description
          "The number of blocks that were uncorrectable by the FEC";
      }

      leaf fec-uncorrectable-words {
        type yang:counter64;
        description
          "The number of words that were uncorrectable by the FEC";
      }

      leaf fec-corrected-bytes {
        type yang:counter64;
        description
          "The number of bytes that were corrected by the FEC";
      }

      leaf fec-corrected-bits {
        type yang:counter64;
        description
          "The number of bits that were corrected by the FEC";
      }

      container pre-fec-ber {
        description
          "Bit error rate before forward error correction -- computed
        value with 18 decimal precision. Note that decimal64
        supports values as small as i x 10^-18 where i is an
        integer. Values smaller than this should be reported as 0
        to inidicate error free or near error free performance.
        Values include the instantaneous, average, minimum, and
        maximum statistics. If avg/min/max statistics are not
        supported, the target is expected to just supply the
        instant value";
        uses oc-opt-types:avg-min-max-instant-stats-precision18-ber;
      }  // container pre-fec-ber

      container post-fec-ber {
        description
          "Bit error rate after forward error correction -- computed
        value with 18 decimal precision. Note that decimal64
        supports values as small as i x 10^-18 where i is an
        integer. Values smaller than this should be reported as 0
        to inidicate error free or near error free performance.
        Values include the instantaneous, average, minimum, and
        maximum statistics. If avg/min/max statistics are not
        supported, the target is expected to just supply the
        instant value";
        uses oc-opt-types:avg-min-max-instant-stats-precision18-ber;
      }  // container post-fec-ber

      container supply-voltage {
        description
          "Supply voltage to the transceiver in volts with 2 decimal
        precision. Values include the instantaneous, average, minimum,
        and maximum statistics. If avg/min/max statistics are not
        supported, the target is expected to just supply the instant
        value.";
        uses oc-platform-types:avg-min-max-instant-stats-precision2-volts;
      }  // container supply-voltage

      uses optical-power-state;
    }  // grouping port-transceiver-state

    grouping transceiver-threshold-state {
      description
        "Grouping for all alarm threshold configs for a particular
      severity level.";
      leaf severity {
        type identityref {
          base oc-alarm-types:OPENCONFIG_ALARM_SEVERITY;
        }
        description
          "The type of alarm to which the thresholds apply.";
      }

      leaf laser-temperature-upper {
        type decimal64 {
          fraction-digits 1;
        }
        units "celsius";
        description
          "The upper temperature threshold for the laser temperature sensor.
        This leaf value is compared to the instant value of
        laser-temperature.";
      }

      leaf laser-temperature-lower {
        type decimal64 {
          fraction-digits 1;
        }
        units "celsius";
        description
          "The lower temperature threshold for the laser temperature sensor.
        This leaf value is compared to the instant value of
        laser-temperature.";
      }

      leaf output-power-upper {
        type decimal64 {
          fraction-digits 2;
        }
        units "dBm";
        description
          "The upper power threshold for the laser output power. This threshold
        applies to every physical-channel on the transceiver and does not
        apply to the aggregate transceiver optical-output-power. This leaf
        value is compared to the instant value of optical-output-power.";
      }

      leaf output-power-lower {
        type decimal64 {
          fraction-digits 2;
        }
        units "dBm";
        description
          "The lower power threshold for the laser output power. This threshold
        applies to every physical-channel on the transceiver and does not
        apply to the aggregate transceiver optical-output-power. This leaf
        value is compared to the instant value of optical-output-power.";
      }

      leaf input-power-upper {
        type decimal64 {
          fraction-digits 2;
        }
        units "dBm";
        description
          "The upper power threshold for the laser input power. This threshold
        applies to every physical-channel on the transceiver and does not
        apply to the aggregate transceiver optical-input-power. This leaf
        value is compared to the instant value of optical-input-power.";
      }

      leaf input-power-lower {
        type decimal64 {
          fraction-digits 2;
        }
        units "dBm";
        description
          "The lower power threshold for the laser input power. This threshold
        applies to every physical-channel on the transceiver and does not
        apply to the aggregate transceiver optical-input-power. This leaf
        value is compared to the instant value of optical-input-power.";
      }

      leaf laser-bias-current-upper {
        type decimal64 {
          fraction-digits 2;
        }
        units "mA";
        description
          "The upper threshold for the laser bias current. This leaf value is
        compared to the instant value of last-bias-current.";
      }

      leaf laser-bias-current-lower {
        type decimal64 {
          fraction-digits 2;
        }
        units "mA";
        description
          "The lower threshold for the laser bias current. This leaf value is
        compared to the instant value of last-bias-current.";
      }

      leaf supply-voltage-upper {
        type decimal64 {
          fraction-digits 2;
        }
        units "volts";
        description
          "The upper threshold for the transceiver supply voltage. This leaf
        value is compared to the instant value of supply-voltage.";
      }

      leaf supply-voltage-lower {
        type decimal64 {
          fraction-digits 2;
        }
        units "volts";
        description
          "The lower threshold for the transceiver supply voltage. This leaf
        value is compared to the instant value of supply-voltage.";
      }

      leaf module-temperature-lower {
        type decimal64 {
          fraction-digits 1;
        }
        units "celsius";
        description
          "The lower temperature threshold for the transceiver module. This
        leaf value is compared to the instant value of module-temperature.";
      }

      leaf module-temperature-upper {
        type decimal64 {
          fraction-digits 1;
        }
        units "celsius";
        description
          "The upper temperature threshold for the transceiver module. This
        leaf value is compared to the instant value of module-temperature.";
      }
    }  // grouping transceiver-threshold-state

    grouping port-transceiver-top {
      description
        "Top-level grouping for client port transceiver data";
      container transceiver {
        description
          "Top-level container for client port transceiver data";
        container config {
          description
            "Configuration data for client port transceivers";
          uses port-transceiver-config;
        }  // container config

        container state {
          config false;
          description
            "Operational state data for client port transceivers";
          uses port-transceiver-config;

          uses port-transceiver-state;
        }  // container state

        uses physical-channel-top;

        uses transceiver-threshold-top;
      }  // container transceiver
    }  // grouping port-transceiver-top

    augment /oc-platform:components/oc-platform:component {
      description
        "Adding transceiver data to physical inventory. This subtree is
      only valid when the type of the component is TRANSCEIVER.";
      uses port-transceiver-top;
    }

    augment /oc-if:interfaces/oc-if:interface/oc-if:state {
      description
        "Adds a reference from an interface to the corresponding
      transceiver component.";
      leaf transceiver {
        type leafref {
          path "/oc-platform:components/oc-platform:component[oc-platform:name=current()/../oc-port:hardware-port]/oc-platform:subcomponents/oc-platform:subcomponent/oc-platform:name";
        }
        description
          "Provides a reference to the transceiver subcomponent that
        corresponds to the physical port component for this interface.
        The device must only populate this leaf with a reference to
        a component of type TRANSCEIVER.";
      }
    }

    augment /oc-if:interfaces/oc-if:interface/oc-if:state {
      description
        "Adds a reference from the base interface to its corresponding
      physical channels.";
      leaf-list physical-channel {
        type leafref {
          path "/oc-platform:components/oc-platform:component[oc-platform:name=current()/../oc-transceiver:transceiver]/oc-transceiver:transceiver/oc-transceiver:physical-channels/oc-transceiver:channel/oc-transceiver:index";
        }
        description
          "For a channelized interface, list of references to the
        physical channels (lanes) corresponding to the interface.
        The physical channels are elements of a transceiver component
        in the platform model.";
      }
    }
  }  // module openconfig-platform-transceiver