module openconfig-transport-line-protection {

    yang-version 1;

    namespace
      "http://openconfig.net/yang/optical-transport-line-protection";

    prefix oc-line-protect;

    import openconfig-extensions {
      prefix oc-ext;
    }
    import openconfig-types {
      prefix oc-types;
    }
    import openconfig-platform {
      prefix oc-platform;
    }

    organization "OpenConfig working group";

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

    description
      "This model describes configuration and operational state data
    for optical line protection elements, deployed as part of a
    transport line system. An Automatic Protection Switch (APS)
    is typically installed in the same device as the amplifiers
    and wave-router, however an APS can also be a standalone
    device. In both scenarios, it serves the same purpose of
    providing protection using two dark fiber pairs to ensure the
    amplifiers can still receive a signal if one of the two fiber
    pairs is broken. The APS port details and directionality are
    shown below. The three major attributes, together with their
    modifiers, define the behavior of the APS and can be prioritized
    in the descending order as shown in the following table";

    revision "2018-11-21" {
      description
        "Add OpenConfig module metadata extensions.";
      reference
        "0.4.1";

    }

    revision "2018-07-25" {
      description
        "Added wait-to-restore-time, hold-off-time,
      relative-switch-threshold, relative-switch-threshold-offset,
      forced-to-port, removed secondary-switch-hysteresis, and
      edited the description of primary-switch-threshold,
      secondary-switch-threshold, and primary-switch-hysteresis";
      reference
        "0.4.0";

    }

    revision "2017-09-08" {
      description
        "Correct bug with OSC interfaces";
      reference
        "0.3.1";

    }

    revision "2017-07-08" {
      description
        "Support multiple OCMs, add monitor port type
      and refs to hw ports, ";
      reference
        "0.3.0";

    }

    revision "2017-03-28" {
      description
        "Added min/max/avg stats, status for media channels, OCM, APS";
      reference
        "0.2.0";

    }

    revision "2016-08-05" {
      description "Initial public release";
      reference
        "0.1.0";

    }

    oc-ext:openconfig-version "0.4.1";
    oc-ext:regexp-posix;
    oc-ext:catalog-organization "openconfig";
    oc-ext:origin "openconfig";

    identity APS_PATHS {
      description
        "Base identity for identifying the line paths on an
      automatic protection switch";
    }

    identity PRIMARY {
      base APS_PATHS;
      description
        "The primary line path connected to an automatic protection
      switch port indicating the primary/preferred path";
    }

    identity SECONDARY {
      base APS_PATHS;
      description
        "The secondary line path connected to an automatic protection
      switch port indicating the secondary path";
    }
  }  // module openconfig-transport-line-protection