module bbf-xpon-power-management {

    yang-version 1.1;

    namespace
      "urn:bbf:yang:bbf-xpon-power-management";

    prefix bbf-xpon-pwr;

    organization
      "Broadband Forum <https://www.broadband-forum.org>
Fiber Access Networks Work Area";

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

Editor:      Joey Boyd, ADTRAN

Editor:      Igor Ternovsky, Broadcom

Editor:      Robert Peschi, Nokia

WA Director: Marta Seda, Calix

WA Director: Samuel Chen, Broadcom";

    description
      "This module contains a collection of YANG definitions for
supporting the Broadband Forum requirements on management of
ITU-T Passive Optical Network (PON) interfaces as defined in
ITU-T G.984.x, G.987.x, ITU-T G.989.x and ITU-T G.9807.x. As
such, this module is specific to access network equipment (e.g.,
BBF-specified Access Nodes and FTTdp DPUs).

Specifically, this module contains a collection of YANG
definitions common to Optical Network Unit (ONU) power
management.

Copyright (c) 2018-2020, 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-385i2; see
the TR itself for full legal notices.";

    revision "2020-10-13" {
      description
        "Issue 2.
* Approval Date:    2020-10-13.
* Publication Date: 2020-10-13.";
      reference
        "TR-385i2: ITU-T PON YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-385_Issue-2.pdf>";

    }


    feature xpon-power-management {
      description
        "Indicates support for Optical Network Unit (ONU) power
management.";
      reference
        "ITU-T G.9807.1 clause C.16.1
        ITU-T G.989.3 clause 16
        ITU-T G.987.3 clause 16
        ITU-T G.984.3 Annex E.";

    }

    identity power-mode-base {
      description
        "Base identity for defining Optical Network Unit (ONU) dynamic
power management modes.";
      reference
        "ITU-T G.988.x clause 9.1.14.";

    }

    identity power-mode-doze {
      base power-mode-base;
      description "Doze power saving mode.";
    }

    identity power-mode-cyclic-sleep {
      base power-mode-base;
      description
        "Cyclic Sleep power saving mode.";
    }

    identity power-mode-watchful-sleep {
      base power-mode-base;
      description
        "Watchful Sleep power saving mode.";
    }

    identity power-state-base {
      description
        "Base identity for defining Optical Network Unit (ONU) dynamic
power management states.";
    }

    identity power-state-disabled {
      base power-state-base;
      description
        "Power management is disabled.";
    }

    identity power-state-not-supported {
      base power-state-base;
      description
        "Power management is not supported by the Optical Network Unit
(ONU).";
    }

    identity power-state-awake-forced {
      base power-state-base;
      description
        "The Optical Line Termination (OLT) Channel Termination (CT)
provides normal allocations to ONUi, forwards downstream
traffic, and expects a response to every bandwidth grant. The
OLT CT declares the LOBi defect on detection of the specified
number of missed allocations. On transition into this state,
the OLT CT sends a Sleep_Allow (OFF) PLOAM message, thus
revoking its permission to the Optical Network Unit (ONU) to
enter the LowPower state.";
    }

    identity power-state-awake-free {
      base power-state-base;
      description
        "The Optical Line Termination (OLT) Channel Termination (CT)
provides normal allocations to the Optical Network Unit (ONU),
forwards downstream traffic, and is ready to accept a power
management transition indication from the ONU. On transition
into this state, the OLT CT sends a Sleep_Allow (ON) PLOAM
message,thus granting the ONU a permission to enter the
LowPower state at its own discretion.
The OLT CT expects a response to every bandwidth grant, and
in case of missed allocation transitions to the AwakeForced
state, where LOBi condition can be eventually declared.";
    }

    identity power-state-doze {
      base power-state-base;
      description
        "The Optical Line Termination (OLT) Channel Termination (CT)
supports the Optical Network Unit (ONU) in a 'Watch' low power
state. When ONU is in the 'Watch' state its transmitter is
turned off. The ONU periodically turns on the receiver for a
brief time to check the downstream signal for remote wakeup
indications. When the downstream signal is checked, the ONU
does not respond to bandwidth allocations and does not forward
downstream traffic. This state persists for a configurable
duration if not truncated by the arrival of a local stimulus.

The OLT CT provides normal allocations to the ONU but expects
only intermittent responses from the ONU to bandwidth grants,
as defined by various timers. The OLT CT may either discard or
buffer the downstream traffic.";
    }

    identity power-state-sleep {
      base power-state-base;
      description
        "The Optical Line Termination (OLT) Channel Termination (CT)
supports the Optical Network Unit (ONU) in an 'Asleep' low
power state. The ONU in the 'Asleep' state shuts down both its
transceiver and receiver. ONU 'Asleep' state persists for a
configurable duration if not truncated by the arrival of a
local stimulus.

The OLT CT provides normal allocations to the ONU but expects
only intermittent responses from the ONU to bandwidth grants,
as defined by various timers. The OLT CT forwards the
downstream traffic.";
    }

    identity power-state-watch {
      base power-state-base;
      description
        "The Optical Line Termination (OLT) Channel Termination (CT)
supports the Optical Network Unit (ONU) in a low power state.
The OLT CT provides normal allocations to the ONU but expects
only intermittent responses from the ONU to bandwidth grants,
as defined by various timers. The OLT CT may either discard or
buffer the downstream traffic.";
    }

    identity power-state-alerted {
      base power-state-base;
      description
        "The Optical Line Termination (OLT) Channel Termination (CT)
attempts to wake up the Optical Network Unit (ONU). Having sent
Sleep_Allow (OFF) message on transition to the state,
the OLT CT sets the FWI bit in every allocation to the ONU
along with the PLOAMu flag. The OLT CT discards or buffers
downstream traffic for the ONU, just as it did during the
immediately preceding LowPowerWatch state. The OLT CT goes
to the AwakeForced state if it receives a burst from the ONU
that includes a Sleep_Request (Awake) PLOAM message or if
timer Talerted expires..
In case of XGPON1 ONU this state corresponds to either
AlertedDoze or AlertedSleep [ITU-T] G.987.3 Table 16-5.
In case of GPON ONU this state corresponds to either
AlertedDoze, AlertedSleep or AlertedWatch [ITU-T]
G.984.3 Table E-5.";
    }
  }  // module bbf-xpon-power-management