module openconfig-terminal-device-shadow {

    yang-version 1;

    namespace
      "http://openconfig.net/yang/terminal-device-shadow";

    prefix oc-opt-term-shadow;

    import openconfig-types {
      prefix oc-types;
    }
    import openconfig-transport-types {
      prefix oc-opt-types;
    }
    import openconfig-if-ethernet {
      prefix oc-eth;
    }
    import openconfig-platform {
      prefix oc-platform;
    }
    import openconfig-platform-transceiver {
      prefix oc-transceiver;
    }
    import openconfig-extensions {
      prefix oc-ext;
    }
    import ietf-yang-types {
      prefix yang;
    }

    organization "OpenConfig working group";

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

    description
      "This module describes a terminal optics device model for
managing the terminal systems (client and line side) in a
DWDM transport network.

Elements of the model:

physical port: corresponds to a physical, pluggable client
port on the terminal device. Examples includes 10G, 40G, 100G
(e.g., 10x10G, 4x25G or 1x100G) and 400G/1T in the future.
Physical client ports will have associated operational state or
PMs.

physical channel: a physical lane or channel in the
physical client port.  Each physical client port has 1 or more
channels. An example is 100GBASE-LR4 client physical port having
4x25G channels. Channels have their own optical PMs and can be
monitored independently within a client physical port (e.g.,
channel power).  Physical client channels are defined in the
model as part of a physical client port, and are modeled
primarily for reading their PMs.

logical channel: a logical grouping of logical grooming elements
that may be assigned to subsequent grooming stages for
multiplexing / de-multiplexing, or to an optical channel for
line side transmission.  The logical channels can represent, for
example, an ODU/OTU logical packing of the client
data onto the line side.  Tributaries are similarly logical
groupings of demand that can be represented in this structure and
assigned to an optical channel.  Note that different types of
logical channels may be present, each with their corresponding
PMs.

optical channel:  corresponds to an optical carrier and is
assigned a wavelength/frequency.  Optical channels have PMs
such as power, BER, and operational mode.

Directionality:

To maintain simplicity in the model, the configuration is
described from client-to-line direction.  The assumption is that
equivalent reverse configuration is implicit, resulting in
the same line-to-client configuration.

Physical layout:

The model does not assume a particular physical layout of client
and line ports on the terminal device (e.g., such as number of
ports per linecard, separate linecards for client and line ports,
etc.).";

    revision "2017-07-08" {
      description "Adds test-signal";
      reference
        "1.0.0";

    }

    revision "2016-12-22" {
      description
        "Fixes and additions to terminal optics model";
      reference
        "0.4.0";

    }

    oc-ext:openconfig-version "1.0.0";

    grouping terminal-input-optical-power {
      description
        "Reusable leaves related to input optical power";
      leaf input-power {
        type decimal64 {
          fraction-digits 2;
        }
        units "dBm";
        description
          "The input optical power of this port in units of 0.01dBm.
If the port is an aggregate of multiple physical channels,
this attribute is the total power or sum of all channels.";
      }
    }  // grouping terminal-input-optical-power

    grouping terminal-ethernet-protocol-config {
      description
        "Configuration data for logical channels with Ethernet
framing";
    }  // grouping terminal-ethernet-protocol-config

    grouping terminal-ethernet-protocol-state {
      description
        "Ethernet-specific counters when logical channel
is using Ethernet protocol framing, e.g., 10GE, 100GE";
      uses oc-eth:ethernet-interface-state-counters;
    }  // grouping terminal-ethernet-protocol-state

    grouping terminal-ethernet-protocol-top {
      description
        "Top-level grouping for data related to Ethernet protocol
framing on logical channels";
      container ethernet {
        description
          "Top level container for data related to Ethernet framing
for the logical channel";
        container config {
          description
            "Configuration data for Ethernet protocol framing on
logical channels";
          uses terminal-ethernet-protocol-config;
        }  // container config

        container state {
          config false;
          description
            "Operational state data for Ethernet protocol framing
on logical channels";
          uses terminal-ethernet-protocol-state;
        }  // container state
      }  // container ethernet
    }  // grouping terminal-ethernet-protocol-top

    grouping terminal-otn-protocol-config {
      description
        "OTU configuration when logical channel
framing is using an OTU protocol, e.g., OTU1, OTU3, etc.";
      leaf tti-msg-transmit {
        type string;
        description
          "Trail trace identifier (TTI) message transmitted";
      }

      leaf tti-msg-expected {
        type string;
        description
          "Trail trace identifier (TTI) message expected";
      }

      leaf tti-msg-auto {
        type boolean;
        description
          "Trail trace identifier (TTI) transmit message automatically
created.  If true, then setting a custom transmit message
would be invalid.";
      }
    }  // grouping terminal-otn-protocol-config

    grouping terminal-otn-protocol-counter-stats {
      description
        "Counter based statistics containers for logical channels
using OTN framing";
      leaf errored-seconds {
        type yang:counter64;
        description
          "The number of seconds that at least one errored blocks
occurs, at least one code violation occurs, loss of sync is
detected or loss of signal is detected";
      }

      leaf severely-errored-seconds {
        type yang:counter64;
        description
          "The number of seconds that loss of frame is detected OR
the number of errored blocks, code violations, loss of sync
or loss of signal is detected exceeds a predefined
threshold";
      }

      leaf unavailable-seconds {
        type yang:counter64;
        description
          "The number of seconds during which the link is unavailable";
      }

      leaf code-violations {
        type yang:counter64;
        description
          "For ethernet or fiberchannel links, the number of 8b/10b
coding violations. For SONET/SDH, the number of BIP (bit
interleaved parity) errors";
      }

      leaf fec-uncorrectable-words {
        type yang:counter64;
        description
          "The number 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";
      }

      leaf background-block-errors {
        type yang:counter64;
        description
          "The number of background block errors";
      }
    }  // grouping terminal-otn-protocol-counter-stats

    grouping terminal-otn-protocol-multi-stats {
      description
        "Multi-value statistics containers for logical channels using
OTN framing (e.g., max, min, avg, instant)";
      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 q-value {
        description
          "Quality value (factor) in dB of a channel with 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-dB;
      }  // container q-value

      container esnr {
        description
          "Electrical signal to noise ratio. Baud rate
normalized signal to noise ratio based on
error vector magnitude in dB with 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-dB;
      }  // container esnr
    }  // grouping terminal-otn-protocol-multi-stats

    grouping terminal-otn-protocol-state {
      description
        "OTU operational state when logical channel
framing is using an OTU protocol, e.g., OTU1, OTU3, etc.";
      leaf tti-msg-recv {
        type string;
        description
          "Trail trace identifier (TTI) message received";
      }

      leaf rdi-msg {
        type string;
        description
          "Remote defect indication (RDI) message received";
      }

      uses terminal-otn-protocol-counter-stats;

      uses terminal-otn-protocol-multi-stats;
    }  // grouping terminal-otn-protocol-state

    grouping terminal-otn-protocol-top {
      description
        "Top-level grouping for data related to OTN protocol framing";
      container otn {
        description
          "Top level container for OTU configuration when logical
channel framing is using an OTU protocol, e.g., OTU1, OTU3,
etc.";
        container config {
          description
            "Configuration data for OTN protocol framing";
          uses terminal-otn-protocol-config;
        }  // container config

        container state {
          config false;
          description
            "Operational state data for OTN protocol PMs, statistics,
etc.";
          uses terminal-otn-protocol-config;

          uses terminal-otn-protocol-state;
        }  // container state
      }  // container otn
    }  // grouping terminal-otn-protocol-top

    grouping terminal-client-port-assignment-config {
      description
        "Configuration data for assigning physical client ports to
logical channels";
      leaf index {
        type uint32;
        description
          "Index of the client port assignment";
      }

      leaf description {
        type string;
        description
          "Descriptive name for the client port-to-logical channel
mapping";
      }

      leaf logical-channel {
        type leafref {
          path
            "/oc-opt-term-shadow:terminal-device/oc-opt-term-shadow:logical-channels/oc-opt-term-shadow:channel/oc-opt-term-shadow:index";
        }
        description
          "Reference to the logical channel for this
assignment";
      }

      leaf allocation {
        type decimal64 {
          fraction-digits 3;
        }
        units "Gbps";
        description
          "Allocation of the client physical port to the assigned
logical channel expressed in Gbps.  In most cases,
the full client physical port rate is assigned to a single
logical channel.";
      }
    }  // grouping terminal-client-port-assignment-config

    grouping terminal-client-port-assignment-state {
      description
        "Operational state data for assigning physical client ports
to logical channels";
    }  // grouping terminal-client-port-assignment-state

    grouping terminal-client-port-assignment-top {
      description
        "Top-level grouping for the assigment of client physical ports
to logical channels";
      container logical-channel-assignments {
        description
          "Enclosing container for client port to logical client
mappings";
        list assignment {
          key "index";
          description
            "List of assignments to logical clients";
          leaf index {
            type leafref {
              path "../config/index";
            }
            description
              "Reference to the index of this logical client
assignment";
          }

          container config {
            description
              "Configuration data for the logical client assignment";
            uses terminal-client-port-assignment-config;
          }  // container config

          container state {
            config false;
            description
              "Operational state data for the logical client
assignment";
            uses terminal-client-port-assignment-config;

            uses terminal-client-port-assignment-state;
          }  // container state
        }  // list assignment
      }  // container logical-channel-assignments
    }  // grouping terminal-client-port-assignment-top

    grouping terminal-logical-chan-assignment-config {
      description
        "Configuration data for assigning client logical channels
to line-side tributaries";
      leaf index {
        type uint32;
        description
          "Index of the current logical client channel to tributary
mapping";
      }

      leaf description {
        type string;
        description
          "Name assigned to the logical client channel";
      }

      leaf assignment-type {
        type enumeration {
          enum "LOGICAL_CHANNEL" {
            value 0;
            description
              "Subsequent channel is a logical channel";
          }
          enum "OPTICAL_CHANNEL" {
            value 1;
            description
              "Subsequent channel is a optical channel / carrier";
          }
        }
        description
          "Each logical channel element may be assigned to subsequent
stages of logical elements to implement further grooming, or
can be assigned to a line-side optical channel for
transmission.  Each assignment also has an associated
bandwidth allocation.";
      }

      leaf logical-channel {
        type leafref {
          path
            "/oc-opt-term-shadow:terminal-device/oc-opt-term-shadow:logical-channels/oc-opt-term-shadow:channel/oc-opt-term-shadow:index";
        }
        must
          "../assignment-type = 'LOGICAL_CHANNEL'" {
          description
            "The assignment-type must be set to LOGICAL_CHANNEL for
this leaf to be valid";
        }
        description
          "Reference to another stage of logical channel elements.";
      }

      leaf optical-channel {
        type leafref {
          path
            "/oc-platform:components/oc-platform:component/oc-platform:name";
        }
        must
          "../assignment-type = 'OPTICAL_CHANNEL'" {
          description
            "The assignment-type must be set to OPTICAL_CHANNEL for
this leaf to be valid";
        }
        description
          "Reference to the line-side optical channel that should
carry the current logical channel element.  Use this
reference to exit the logical element stage.";
      }

      leaf allocation {
        type decimal64 {
          fraction-digits 3;
        }
        units "Gbps";
        description
          "Allocation of the logical client channel to the tributary
or sub-channel, expressed in Gbps";
      }
    }  // grouping terminal-logical-chan-assignment-config

    grouping terminal-logical-chan-assignment-state {
      description
        "Operational state data for the assignment of logical client
channel to line-side tributary";
    }  // grouping terminal-logical-chan-assignment-state

    grouping terminal-logical-chan-assignment-top {
      description
        "Top-level grouping for the list of logical client channel-to-
tributary assignments";
      container logical-channel-assignments {
        description
          "Enclosing container for tributary assignments";
        list assignment {
          key "index";
          description
            "Logical channel elements may be assigned directly to
optical channels for line-side transmission, or can be
further groomed into additional stages of logical channel
elements.  The grooming can multiplex (i.e., split the
current element into multiple elements in the subsequent
stage) or de-multiplex (i.e., combine the current element
with other elements into the same element in the subsequent
stage) logical elements in each stage.

Note that to support the ability to groom the logical
elements, the list of logical channel elements should be
populated with an entry for the logical elements at
each stage, starting with the initial assignment from the
respective client physical port.

Each logical element assignment consists of a pointer to
an element in the next stage, or to an optical channel,
along with a bandwidth allocation for the corresponding
assignment (e.g., to split or combine signal).";
          leaf index {
            type leafref {
              path "../config/index";
            }
            description
              "Reference to the index for the current tributary
assignment";
          }

          container config {
            description
              "Configuration data for tributary assignments";
            uses terminal-logical-chan-assignment-config;
          }  // container config

          container state {
            config false;
            description
              "Operational state data for tributary assignments";
            uses terminal-logical-chan-assignment-config;

            uses terminal-logical-chan-assignment-state;
          }  // container state
        }  // list assignment
      }  // container logical-channel-assignments
    }  // grouping terminal-logical-chan-assignment-top

    grouping terminal-logical-channel-ingress-config {
      description
        "Configuration data for ingress signal to logical channel";
      leaf transceiver {
        type leafref {
          path
            "/oc-platform:components/oc-platform:component/oc-platform:name";
        }
        description
          "Reference to the transceiver carrying the input signal
for the logical channel.  If specific physical channels
are mapped to the logical channel (as opposed to all
physical channels carried by the transceiver), they can be
specified in the list of physical channel references.";
      }

      leaf-list physical-channel {
        type leafref {
          path
            "/oc-platform:components/oc-platform:component/oc-transceiver:transceiver/oc-transceiver:physical-channels/oc-transceiver:channel/oc-transceiver:index";
        }
        description
          "This list should be populated with references
to the client physical channels that feed this logical
channel from the transceiver specified in the 'transceiver'
leaf, which must be specified.  If this leaf-list is empty,
all physical channels in the transceiver are assumed to be
mapped to the logical channel.";
      }
    }  // grouping terminal-logical-channel-ingress-config

    grouping terminal-logical-channel-ingress-state {
      description
        "Operational state data for ingress signal to logical channel";
    }  // grouping terminal-logical-channel-ingress-state

    grouping terminal-logical-channel-ingress-top {
      description
        "Top-level grouping for ingress signal to logical channel";
      container ingress {
        description
          "Top-level container for specifying references to the
source of signal for the logical channel, either a
transceiver or individual physical channels";
        container config {
          description
            "Configuration data for the signal source for the
logical channel";
          uses terminal-logical-channel-ingress-config;
        }  // container config

        container state {
          config false;
          description
            "Operational state data for the signal source for the
logical channel";
          uses terminal-logical-channel-ingress-config;

          uses terminal-logical-channel-ingress-state;
        }  // container state
      }  // container ingress
    }  // grouping terminal-logical-channel-ingress-top

    grouping terminal-logical-channel-config {
      description
        "Configuration data for logical channels";
      leaf index {
        type uint32;
        description
          "Index of the current logical channel";
      }

      leaf description {
        type string;
        description
          "Description of the logical channel";
      }

      leaf admin-state {
        type oc-opt-types:admin-state-type;
        description
          "Sets the admin state of the logical channel";
      }

      leaf rate-class {
        type identityref {
          base oc-opt-types:TRIBUTARY_RATE_CLASS_TYPE;
        }
        description
          "Rounded bit rate of the tributary signal. Exact bit rate
will be refined by protocol selection.";
      }

      leaf trib-protocol {
        type identityref {
          base oc-opt-types:TRIBUTARY_PROTOCOL_TYPE;
        }
        description
          "Protocol framing of the tributary signal. If this
LogicalChannel is directly connected to a Client-Port or
Optical-Channel, this is the protocol of the associated port.
If the LogicalChannel is connected to other LogicalChannels,
the TributaryProtocol of the LogicalChannels will define a
specific mapping/demapping or multiplexing/demultiplexing
function.

Not all protocols are valid, depending on the value
of trib-rate-class.  The expectation is that the NMS
will validate that a correct combination of rate class
and protocol are specfied.  Basic combinations are:

rate class: 1G
protocols: 1GE

rate class: 2.5G
protocols: OC48, STM16

rate class: 10G
protocols:  10GE LAN, 10GE WAN, OC192, STM64, OTU2, OTU2e,
	   OTU1e, ODU2, ODU2e, ODU1e

rate class: 40G
protocols:  40GE, OC768, STM256, OTU3, ODU3

rate class: 100G
protocols:  100GE, 100G MLG, OTU4, OTUCn, ODU4";
      }

      leaf logical-channel-type {
        type identityref {
          base oc-opt-types:LOGICAL_ELEMENT_PROTOCOL_TYPE;
        }
        description
          "The type / stage of the logical element determines the
configuration and operational state parameters (PMs)
available for the logical element";
      }

      leaf loopback-mode {
        type oc-opt-types:loopback-mode-type;
        description
          "Sets the loopback type on the logical channel. Setting the
mode to something besides NONE activates the loopback in
the specified mode.";
      }

      leaf test-signal {
        type boolean;
        description
          "When enabled the logical channel's DSP will generate a pseudo
randmon bit stream (PRBS) which can be used during testing.";
      }
    }  // grouping terminal-logical-channel-config

    grouping terminal-logical-channel-state {
      description
        "Operational state data for logical client channels";
      leaf link-state {
        type enumeration {
          enum "UP" {
            value 0;
            description
              "Logical channel is operationally up";
          }
          enum "DOWN" {
            value 1;
            description
              "Logical channel is operationally down";
          }
        }
        description
          "Link-state of the Ethernet protocol on the logical channel,
SONET / SDH framed signal, etc.";
      }
    }  // grouping terminal-logical-channel-state

    grouping terminal-logical-channel-top {
      description
        "Top-level grouping for logical channels";
      container logical-channels {
        description
          "Enclosing container the list of logical channels";
        list channel {
          key "index";
          description
            "List of logical channels";
          leaf index {
            type leafref {
              path "../config/index";
            }
            description
              "Reference to the index of the logical channel";
          }

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

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

            uses terminal-logical-channel-state;
          }  // container state

          uses terminal-otn-protocol-top {
            when
              "config/logical-channel-type = 'PROT_OTN'" {
              description
                "Include the OTN protocol data only when the
channel is using OTN framing.";
            }
          }

          uses terminal-ethernet-protocol-top {
            when
              "config/logical-channel-type = 'PROT_ETHERNET'" {
              description
                "Include the Ethernet protocol statistics only when the
protocol used by the link is Ethernet.";
            }
          }

          uses terminal-logical-channel-ingress-top;

          uses terminal-logical-chan-assignment-top;
        }  // list channel
      }  // container logical-channels
    }  // grouping terminal-logical-channel-top

    grouping terminal-optical-channel-config {
      description
        "Configuration data for describing optical channels";
      leaf frequency {
        type oc-opt-types:frequency-type;
        description
          "Frequency of the optical channel, expressed in MHz";
      }

      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)";
      }

      leaf operational-mode {
        type uint16;
        description
          "Vendor-specific mode identifier -- sets the operational
mode for the channel.  The specified operational mode must
exist in the list of supported operational modes supplied
by the device";
      }

      leaf line-port {
        type leafref {
          path
            "/oc-platform:components/oc-platform:component/oc-platform:name";
        }
        description
          "Reference to the line-side physical port that carries
this optical channel.  The target port should be
a component in the physical inventory data model.";
      }
    }  // grouping terminal-optical-channel-config

    grouping terminal-optical-channel-state {
      description
        "Operational state data for optical channels";
      leaf group-id {
        type uint32;
        description
          "If the device places constraints on which optical
channels must be managed together (e.g., transmitted on the
same line port), it can indicate that by setting the group-id
to the same value across related optical channels.";
      }

      uses oc-transceiver:optical-power-state;

      container chromatic-dispersion {
        description
          "Chromatic Dispersion of an optical channel in
picoseconds / nanometer (ps/nm) as reported by receiver
with 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-opt-types:avg-min-max-instant-stats-precision2-ps-nm;
      }  // container chromatic-dispersion

      container polarization-mode-dispersion {
        description
          "Polarization Mode Dispersion of an optical channel
in picosends (ps) as reported by receiver with 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-opt-types:avg-min-max-instant-stats-precision2-ps;
      }  // container polarization-mode-dispersion

      container second-order-polarization-mode-dispersion {
        description
          "Second Order Polarization Mode Dispersion of an optical
channel in picoseconds squared (ps^2) as reported by
receiver with 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-opt-types:avg-min-max-instant-stats-precision2-ps2;
      }  // container second-order-polarization-mode-dispersion

      container polarization-dependent-loss {
        description
          "Polarization Dependent Loss of an optical channel
in dB as reported by receiver with 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-dB;
      }  // container polarization-dependent-loss
    }  // grouping terminal-optical-channel-state

    grouping terminal-optical-channel-top {
      description
        "Top-level grouping for optical channel data";
      container optical-channel {
        description
          "Enclosing container for the list of optical channels";
        container config {
          description
            "Configuration data for optical channels";
          uses terminal-optical-channel-config;
        }  // container config

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

          uses terminal-optical-channel-state;
        }  // container state
      }  // container optical-channel
    }  // grouping terminal-optical-channel-top

    grouping terminal-operational-mode-config {
      description
        "Configuration data for vendor-supported operational modes";
    }  // grouping terminal-operational-mode-config

    grouping terminal-operational-mode-state {
      description
        "Operational state data for vendor-supported operational
modes";
      leaf mode-id {
        type uint16;
        description
          "Two-octet encoding of the vendor-defined operational
mode";
      }

      leaf description {
        type string;
        description
          "Vendor-supplied textual description of the characteristics
of this operational mode to enable operators to select the
appropriate mode for the application.";
      }

      leaf vendor-id {
        type string;
        description
          "Identifier to represent the vendor / supplier of the
platform and the associated operational mode information";
      }
    }  // grouping terminal-operational-mode-state

    grouping terminal-operational-mode-top {
      description
        "Top-level grouping for vendor-supported operational modes";
      container operational-modes {
        description
          "Enclosing container for list of operational modes";
        list mode {
          key "mode-id";
          config false;
          description
            "List of operational modes supported by the platform.
The operational mode provides a platform-defined summary
of information such as symbol rate, modulation, pulse
shaping, etc.";
          leaf mode-id {
            type leafref {
              path "../state/mode-id";
            }
            description
              "Reference to mode-id";
          }

          container config {
            description
              "Configuration data for operational mode";
            uses terminal-operational-mode-config;
          }  // container config

          container state {
            config false;
            description
              "Operational state data for the platform-defined
operational mode";
            uses terminal-operational-mode-config;

            uses terminal-operational-mode-state;
          }  // container state
        }  // list mode
      }  // container operational-modes
    }  // grouping terminal-operational-mode-top

    grouping terminal-device-config {
      description
        "Configuration data for transport terminal devices at a
device-wide level";
    }  // grouping terminal-device-config

    grouping terminal-device-state {
      description
        "Operational state data for transport terminal devices at a
device-wide level";
    }  // grouping terminal-device-state

    grouping terminal-device-top {
      description
        "Top-level grouping for data for terminal devices";
      container terminal-device {
        description
          "Top-level container for the terminal device";
        container config {
          description
            "Configuration data for global terminal-device";
          uses terminal-device-config;
        }  // container config

        container state {
          config false;
          description
            "Operational state data for global terminal device";
          uses terminal-device-config;

          uses terminal-device-state;
        }  // container state

        uses terminal-logical-channel-top;

        uses terminal-operational-mode-top;
      }  // container terminal-device
    }  // grouping terminal-device-top

    uses terminal-device-top;
  }  // module openconfig-terminal-device-shadow