submodule bbf-vdsl-xtu-channel-status-body {

    yang-version 1.1;

    belongs-to bbf-vdsl {
        prefix bbf-vdsl;
    }

    import bbf-yang-types {
      prefix bbf-yang;
    }

    organization
      "Broadband Forum <https://www.broadband-forum.org>
     Common YANG Work Area";

    contact
      "Comments or questions about this Broadband Forum YANG module
     should be directed to <mailto:help@broadband-forum.org>.

     Editor:      Ken Kerpez, ASSIA, Inc.

     Editor:      Joey Boyd, Adtran

     PS Leader:   Joey Boyd, Adtran

     WA Director: Sven Ooghe, Nokia

     WA Director: Joey Boyd, Adtran";

    description
      "This submodule contains a collection of YANG definitions for
     managing Broadband Forum TR-252i3 clause 6.1.2 xDSL Transceiver
     Unit (xTU) Channel Status.

     Copyright (c) 2016-2022 Broadband Forum

     Redistribution and use in source and binary forms, with or
     without modification, are permitted provided that the following
     conditions are met:

     1. Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

     2. 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.

     3. Neither the name of the copyright holder 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 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.

     The above license is used as a license under copyright only.
     Please reference the Forum IPR Policy for patent licensing terms
     <https://www.broadband-forum.org/ipr-policy>.

     Any moral rights which are necessary to exercise under the above
     license grant are also deemed granted under this license.

     This version of this YANG module is part of TR-355a4; see
     the TR itself for full legal notices.";

    revision "2022-05-23" {
      description
        "Amendment 4.
       * Approval Date:    2022-05-23
       * Publication Date: 2022-05-23.";
      reference
        "TR-355a4: YANG Modules for FTTdp Management
        	    <https://www.broadband-forum.org/download/
        		   TR-355_Amendment-4.pdf>";

    }

    revision "2020-10-13" {
      description
        "Amendment 3.
       * Approval Date:    2020-10-13
       * Publication Date: 2020-10-13.";
      reference
        "TR-355a3: YANG Modules for FTTdp Management
        	    <https://www.broadband-forum.org/download/
        		   TR-355_Amendment-3.pdf>";

    }

    revision "2019-10-21" {
      description
        "Amendment 2 Corrigendum 1.
       * Approval Date:    2019-10-21
       * Publication Date: 2019-10-21.";
      reference
        "TR-355a2c1: YANG Modules for FTTdp Management
        	    <https://www.broadband-forum.org/download/
        		   TR-355_Amendment-2.pdf>";

    }

    revision "2019-06-11" {
      description
        "Amendment 2.
       * Approval Date:    2019-06-11
       * Publication Date: 2019-06-11.";
      reference
        "TR-355a2: YANG Modules for FTTdp Management
        	  <https://www.broadband-forum.org/technical/download/
        		 TR-355_Amendment-2.pdf>";

    }

    revision "2018-10-01" {
      description
        "Amendment 1.
       * Approval Date:    2018-10-01
       * Publication Date: 2018-10-01.";
      reference
        "TR-355a1: YANG Modules for FTTdp Management
        	  <https://www.broadband-forum.org/technical/download/
        		 TR-355_Amendment-1.pdf>";

    }

    revision "2016-07-18" {
      description
        "Initial revision.
       * Approval Date:    see revision date above.
       * Publication Date: 2016-08-05.";
      reference
        "TR-355: YANG Modules for FTTdp Management
        	<https://www.broadband-forum.org/technical/download/
        		 TR-355.pdf>";

    }


    grouping xtu-channel-status {
      description
        "The xDSL Transceiver Unit (xTU) Channel Status parameters
       represent current channel status/measurements at a particular
       xTU.";
      leaf actual-data-rate {
        type bbf-yang:data-rate32-or-undetermined;
        description
          "Actual data rate or expected throughput (ETR).";
        reference
          "ITU-T G.997.1 clause 7.5.2.1";

      }

      leaf previous-data-rate {
        type bbf-yang:data-rate32-or-undetermined;
        description
          "Previous data rate or expected throughput (ETR). This
         parameter reports the previous net data rate or ETR the
         bearer channel was operating at just before the latest net
         data rate or ETR change event occurred, excluding all
         transitions between L0 state and L1 or L2 states.";
        reference
          "ITU-T G.997.1 clause 7.5.2.2";

      }

      leaf actual-delay {
        type uint16;
        units "milliseconds";
        description
          "Actual delay due to interleaving or retransmission. The
         actual delay is coded in milliseconds (rounded to the nearest
         milliseconds).";
        reference
          "ITU-T G.997.1 clause 7.5.2.3";

      }

      leaf actual-inp {
        type uint16 {
          range "0..2047";
        }
        units "0.1 symbols";
        description
          "Actual Impulse Noise Protection (ACTINP). The value is coded
         in fractions of DMT symbols with a granularity of 0.1
         symbols.
         If retransmission is not used in a given transmit direction,
         this parameter reports the interleaved error correction
         INP. For ITU-T G993.2, the special value 255 indicates an
         ACTINP of 25.5 or higher.
         If retransmission is used in a given transmit direction,
         this parameter reports the actual impulse noise protection
         (INP) against SHINE (under specific conditions detailed in
         ITU T G.998.4) on the bearer channel in the L0 state.
         The special value 2047 indicates an ACTINP of 204.7
         or higher.";
        reference
          "ITU-T G.997.1 clause 7.5.2.4 (ACTINP)";

      }

      leaf inpreport {
        type enumeration {
          enum "0" {
            value 0;
            description
              "If set to 0, the Actual Impulse Noise Protection (ACTINP)
             is computed according to the INP_no_erasure formula.";
          }
          enum "1" {
            value 1;
            description
              "If set to 1, the Actual Impulse Noise Protection (ACTINP)
             is the value estimated by the xDSL Transceiver Unit (xTU)
             receiver.";
          }
        }
        description
          "This parameter reports the method used to compute the
         Actual Impulse Noise Protection (ACTINP). If set to 0, the
         ACTINP is computed according to the INP_no_erasure formula.
         If set to 1, the ACTINP is the value estimated by the xDSL
         Transceiver Unit (xTU) receiver.";
        reference
          "ITU-T G.997.1 clause 7.5.2.5 (INPREPORT);
          ITU-T G.993.2 clause 6";

      }

      leaf nfec {
        type uint8 {
          range "0..255";
        }
        units "bytes";
        description
          "This parameter reports the actual Reed-Solomon codeword
         size used in the latency path in which the bearer channel
         is transported. The value is coded in bytes. It ranges from 0
         to 255.";
        reference
          "ITU-T G.997.1 clause 7.5.2.6.1 (NFEC)";

      }

      leaf rfec {
        type uint8 {
          range "0..16";
        }
        units "bytes";
        description
          "This parameter reports the actual number of Reed-Solomon
         redundancy bytes per codeword used in the latency path
         in which the bearer channel is transported. The value is
         coded in bytes. It ranges from 0 to 16. The value 0
         indicates no Reed-Solomon coding.";
        reference
          "ITU-T G.997.1 clause 7.5.2.6.2 (RFEC)";

      }

      leaf actual-number-of-bits-per-symbol {
        type uint32 {
          range "0..131071";
        }
        units "bits";
        description
          "This parameter reports the actual number of bits per
         symbol assigned to the latency path in which the bearer
         channel is transported. This value does not include
         trellis overhead. The value is coded in bits. It ranges
         from 0 to 131071.";
        reference
          "ITU-T G.997.1 clause 7.5.2.6.3 (LSYMB)";

      }

      leaf actual-interleaving-depth {
        type uint16 {
          range "1..4096";
        }
        description
          "This parameter reports the actual depth of the interleaver
         used in the latency path in which the bearer channel is
         transported. The value ranges from 1 to 4096 in steps of 1.
         The value 1 indicates no interleaving.";
        reference
          "ITU-T G.997.1 clause 7.5.2.6.4 (INTLVDEPTH)";

      }

      leaf actual-interleaving-block-length {
        type uint8 {
          range "4..255";
        }
        description
          "This parameter reports the actual block length of the
         interleaver used in the latency path in which the bearer
         channel is transported. The value ranges from 4 to 255
         in steps of 1.";
        reference
          "ITU-T G.997.1 clause 7.5.2.6.5 (INTLVBLOCK)";

      }

      leaf actual-latency-path {
        type uint8 {
          range "0..3";
        }
        description
          "This parameter reports the index of the actual latency path
         in which the bearer is transported. The valid values are 0,
         1, 2, 3.";
        reference
          "ITU-T G.997.1 clause 7.5.2.7 (LPATH)";

      }

      leaf fec-codewords-per-dtu {
        type uint8 {
          range "1..64";
        }
        description
          "This parameter reports the number of Reed-Solomon Forward
         Error Correction (FEC) codewords per Data Transfer Unit
         (DTU), used in the latency path in which the bearer channel
         is transported, also known as the Q parameter. This parameter
         only applies to systems supporting ITU-T G.998.4.";
        reference
          "ITU-T G.997.1 clause 7.5.2.6.6 (RSPERDTU);
          ITU-T G.998.4 clause 9.4.3.";

      }
    }  // grouping xtu-channel-status

    grouping actual-ndr-inp-rein {
      description
        "This grouping contains Actual Net Data Rate (ACTNDR) and
       Actual Net Data Rate against Repetitive Electrical Impulse
       Noise (ACTINP-REIN).";
      leaf actual-ndr {
        type bbf-yang:data-rate32-or-undetermined;
        description
          "This parameter is independent of whether retransmission is
         used or not in a given transmit direction.
         - In L0 state, this parameter reports the net data rate (as
           specified in ITU-T G.992.3, ITU-T G.992.5 or ITU-T
           G.993.2) at which the bearer channel is operating.
         - In L2 state, the parameter contains the net data rate (as
           specified in ITU-T G.992.3, ITU-T G.992.5 or ITU-T
           G.993.2) in the previous L0 state.
         The data rate is coded in steps of 1000 bits per second.";
        reference
          "ITU-T G.997.1 clause 7.5.2.8 (ACTNDR)";

      }

      leaf actual-inp-against-rein {
        type uint8 {
          range "0..255";
        }
        units "0.1 symbols";
        description
          "If retransmission is used in a given transmit direction, this
         parameter reports the actual Impulse Noise Protection (INP)
         against Repetitive Electrical Impulse Noise (ACTINP-REIN)
         (under specific conditions detailed in ITU T G.998.4) on
         the bearer channel in the L0 state. In the L2 state, the
         parameter contains the INP in the previous L0 state. The
         value is coded in fractions of DMT symbols with a granularity
         of 0.1 symbols. The range is from 0 to 25.4. A special value
         of 255 indicates an ACTINP_REIN of 25.5 or higher.";
        reference
          "ITU-T G.997.1 7.5.2.9 (ACTINP_REIN)";

      }
    }  // grouping actual-ndr-inp-rein
  }  // submodule bbf-vdsl-xtu-channel-status-body