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diff --git a/ntsimulator/yang/x-ran/xran-ald.yang b/ntsimulator/yang/x-ran/xran-ald.yang
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+module xran-ald {
+  yang-version 1.1;
+  namespace "urn:xran:ald:1.0";
+  prefix "xran-ald";
+
+  import xran-ald-port {
+    prefix "ap";
+  }
+
+  organization "xRAN Alliance";
+
+  contact
+    "www.xran.org";
+
+  description
+    "This module defines the module for the ald communication.
+
+    Copyright 2018 the xRAN Forum.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS '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 SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
+
+    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 above disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the above disclaimer in the documentation
+    and/or other materials provided with the distribution.
+    * Neither the Members of the xRAN Forum nor the names of its
+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.";
+
+  revision "2018-07-20" {
+    description
+      "version 1.0.0 - First release of the xRAN YANG M-Plane models.
+
+      This version of the model supports v01.00 of the corrsponding xRAN
+      M-Plane Specification.";
+    reference "XRAN-FH.MP.0-v01.00";
+  }
+
+  // rpc-statements
+  rpc ald-communication {
+    description
+      "Rpc to support communication between lls-CU and Antenna Line Devices";
+
+	input {
+      leaf port-id {
+	    type leafref {
+		  path "/ap:ald-ports-io/ap:ald-port/ap:port-id";
+		}
+        mandatory true;
+        description
+          "Unique ALD port identifier reported by radio";
+      }
+
+	  leaf ald-req-msg {
+	    type binary {
+		  length "0..1200";
+		}
+
+		description
+		  "Response message to be forwarded to ALD in type of binary-string";
+	  }
+    }
+
+	output {
+      leaf port-id {
+	    type leafref {
+		  path "/ap:ald-ports-io/ap:ald-port/ap:port-id";
+		}
+        mandatory true;
+        description
+          "Unique ALD port identifier reported by radio";
+      }
+
+      leaf status {
+        type enumeration {
+          enum ACCEPTED {
+		    description
+			  "Operation was accepted, message was processed towards ALD and response is provided";
+		  }
+          enum REJECTED {
+		    description
+			  "Operation was rejected by RU";
+		  }
+        }
+        mandatory true;
+
+        description
+		  "Status of RPC handling seen from RU perspective";
+      }
+
+      leaf error-message {
+        when "../status='REJECTED'";
+        type string;
+
+		description
+		  "Detailed error message when the status is rejected. E.g. wrong ALD port identifier was used in RPC received from Netconf Client";
+      }
+
+	  leaf ald-resp-msg {
+	    type binary {
+		  length "0..1200";
+		}
+
+		description
+		  "Response message forwarded from ALD in type of binary-string";
+	  }
+
+	  leaf frames-with-wrong-crc {
+	    type uint32;
+
+		description
+		  "Number of frames with incorrect CRC (FCS) received from ALD - running counter";
+	  }
+
+	  leaf frames-without-stop-flag {
+	    type uint32;
+
+		description
+		  "Number of frames without stop flag received from ALD - running counter";
+	  }
+
+	  leaf number-of-received-octets {
+	    type uint32;
+
+		description
+		  "Number of octets received from HDLC bus - running counter";
+	  }
+    }
+  }
+}