diff --git a/apps/openroadm/yangmodel/src/main/yang/org-openroadm-otn-otu-interfaces.yang b/apps/openroadm/yangmodel/src/main/yang/org-openroadm-otn-otu-interfaces.yang
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+++ b/apps/openroadm/yangmodel/src/main/yang/org-openroadm-otn-otu-interfaces.yang
@@ -0,0 +1,185 @@
+module org-openroadm-otn-otu-interfaces {
+  namespace "http://org/openroadm/otn-otu-interfaces";
+  prefix org-openroadm-otn-otu-interfaces;
+
+  import org-openroadm-device {
+    prefix org-openroadm-device;
+  }
+  import org-openroadm-interfaces {
+    prefix openROADM-if;
+  }
+  import org-openroadm-maintenance-loopback {
+    prefix org-openroadm-maint-loopback;
+  }
+
+  organization "Open ROADM MSA";
+  contact
+    "OpenROADM.org";
+  description
+    "YANG definitions for device facility otnotu interfaces.
+     
+     Copyright of the Members of the Open ROADM MSA Agreement dated (c) 2016, 
+     AT&T Intellectual Property.  All other rights reserved.
+     
+     Redistribution and use in source and binary forms, with or without modification, 
+     are permitted provided that the following conditions are met:
+     
+     * Redistributions of source code must retain the above copyright notice, this 
+       list of conditions and the following disclaimer.
+     * Redistributions in binary form must reproduce the above copyright notice, 
+       this list of conditions and the following disclaimer in the documentation and/or 
+       other materials provided with the distribution.
+     * Neither the Members of the Open ROADM MSA Agreement nor the names of its 
+       contributors may be used to endorse or promote products derived from this software 
+       without specific prior written permission.
+     
+     THIS SOFTWARE IS PROVIDED BY THE MEMBERS OF THE OPEN ROADM MSA  AGREEMENT ''AS IS'' 
+     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+     IN NO EVENT THE MEMBERS OF THE OPEN ROADM MSA  AGREEMENT BE LIABLE FOR ANY DIRECT, 
+     INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;  LOSS OF USE, DATA, 
+     OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+     WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+     POSSIBILITY OF SUCH DAMAGE.
+     
+     Also contains code components extracted from IETF Interfaces.  These code components
+     are copyrighted and licensed as follows:
+     
+     Copyright (c) 2016 IETF Trust and the persons identified as the document authors.
+     All rights reserved.
+     
+     This document is subject to BCP 78 and the IETF Trust’s Legal Provisions Relating
+     to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of
+     publication of this document. Please review these documents carefully, as they
+     describe your rights and restrictions with respect to this document. Code Components
+     extracted from this document must include Simplified BSD License text as described in
+     Section 4.e of the Trust Legal Provisions and are provided without warranty as
+     described in the Simplified BSD License.";
+
+  revision 2016-10-14 {
+    description
+      "Version 1.2";
+  }
+
+  identity otu-rate-identity {
+    description
+      "A unique rate identification of the OTU.";
+  }
+
+  identity OTU4 {
+    base otu-rate-identity;
+    description
+      "Identity for an OTU4";
+  }
+
+  identity OTU3 {
+    base otu-rate-identity;
+    description
+      "Identity for an OTU3";
+  }
+
+  identity OTU2 {
+    base otu-rate-identity;
+    description
+      "Identity for an OTU2";
+  }
+
+  identity OTU2e {
+    base otu-rate-identity;
+    description
+      "Identity for an OTU2e";
+  }
+
+  identity OTU1 {
+    base otu-rate-identity;
+    description
+      "Identity for an OTU1";
+  }
+
+  identity OTU0 {
+    base otu-rate-identity;
+    description
+      "Identity for an OTU0";
+  }
+
+  identity OTUflex {
+    base otu-rate-identity;
+    description
+      "Identity for an OTUflex";
+  }
+
+  grouping otu-attributes {
+    description
+      "OTU attributes";
+    leaf rate {
+      type identityref {
+        base otu-rate-identity;
+      }
+      description
+        "rate identity of the OTU. 'identityref' is used
+         to allow to extend for future higher rates";
+    }
+    leaf fec {
+      type enumeration {
+        enum "off" {
+          value 0;
+          description
+            "fec off";
+        }
+        enum "rsfec" {
+          value 1;
+          description
+            "rsfec";
+        }
+        enum "sdfeca1" {
+          value 2;
+          description
+            "Clariphy SDFEC";
+        }
+        enum "efec" {
+          value 3;
+          description
+            "G.975.1 I.4";
+        }
+        enum "ufec" {
+          value 4;
+          description
+            "G.975.1 I.7";
+        }
+        enum "sdfec" {
+          value 5;
+          description
+            "Soft decision FEC";
+        }
+        enum "sdfecb1" {
+          value 6;
+          description
+            "SDFEC with SCFEC";
+        }
+        enum "scfec" {
+          value 7;
+          description
+            "Stair case FEC";
+        }
+      }
+      description
+        "Forward Error Correction";
+    }
+  }
+
+  grouping otu-container {
+    container otu {
+      description
+        "Optical Channel Transport Unit (OTU)";
+      uses otu-attributes;
+      uses org-openroadm-maint-loopback:maint-loopback;
+    }
+  }
+
+  augment "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface" {
+    when "org-openroadm-device:type = 'openROADM-if:otnOtu'";
+    uses otu-container;
+  }
+}