Common YANG Data Types for Layer 0 Networks

Layer 0 Types Module Contents This document defines a YANG module for common Layer 0 types, ietf- layer0-types. This module is used for WSON and flexi-grid DWDM networks. The "ietf-layer0-types" module contains the following YANG reusable YANG data types, identities and groupings:

l0-grid-type:: A base YANG identity for the grid type as defined in and .
cwdm-ch-spc-type:: A base YANG identity for the Coarse Wavelength Division Multiplexing (CWDM) channel-spacing type as defined in .
dwdm-ch-spc-type:: A base YANG identity for the DWDM channel-spacing type as defined in .
flexi-ncfg-type:: A base YANG identity for the DWDM flexi-grid Nominal Central Frequency Granularity (NCFG) type as defined in .

Note that the only value for NCFG standardized in is 6.25GHz.

flexi-slot-width-granularity:: A base YANG identity for the DWDM flexi-grid Slot Width Granularity (SWG) type, as defined in .
: Note that the only value for SWG standardized in is 12.5GHz.
fec-type:: A base YANG identity from which specific FEC (Forward Error Correction) type identities are derived.
line-coding:: A base YANG identity from which specific identities defining the bit rate/line coding of optical tributary signals are derived.
wavelength-assignment:: A base YANG identity from which for Wavelength selection method, as defined in .
operational-mode:: A YANG data type used to identify an organization (e.g., vendor) specific mode for transceiver capability description, as defined in Section 2.5.2 of
wson-label-start-end:: The WSON label range was defined in , and the generic topology model defines the label-start/label-end in . This grouping shows the WSON-specific label-start and label-end information. See for more details.
wson-label-hop:: The WSON label range was defined in , and the generic topology model defines the label-hop in . This grouping shows the WSON-specific label-hop information. See for more details.
l0-label-range-info:: A YANG grouping that defines the Layer 0 label range information applicable for WSON as defined in . The label range info is defined per priority .
: This grouping is used in the flexi-grid DWDM by adding more flexi-grid-specific parameters. See for more details.
wson-label-step:: A YANG grouping that defines label steps for WSON as defined in . See for more details.
flexi-grid-label-start-end:: The flexi-grid label range was defined in , and the generic topology model defines the label-start/label-end in .
: This grouping shows the flexi-grid-specific label- start and label-end information which is used to describe the range of available nominal central frequencies. See for more details.
: As described in section 3.1 of , the range of available nominal central frequencies are advertised for m=1, which means that for an available central frequency n, the frequency slot from central frequency n-1 to central frequency n+1 is available.
flexi-grid-label-hop:: The flexi-grid label range was defined in , and the generic topology model defines the label-hop in .
: This grouping shows the WSON-specific label-hop information. See for more details.
flexi-grid-label-range-info:: A YANG grouping that defines flexi-grid label range information as defined in . See for more details. See for more details.
flexi-grid-label-step:: A YANG grouping that defines flexi-grid label steps as defined in . See for more details.
wdm-label-start-end:: A YANG grouping that combines the definition of label-start/label-end information that was defined separately in wson-label-start-end and flexi-grid-label-start-end, to support optical network scenarios that contain both fixed- and flexi-grid links. See for more details.
wdm-label-hop:: A YANG grouping that combines the definition of label hop information that was defined separately in wson-label-hop and flexi-grid-label-hop, to support optical network scenarios that contain both fixed- and flexi-grid links. See for more details.
wdm-label-range-info:: A YANG grouping that combines the definition of label range information that was defined separately in wson-label-range-info and flexi-grid-label-range-info, to support optical network scenarios that contain both fixed- and flexi-grid links. See for more details.
wdm-label-step:: A YANG grouping that combines the definition of label step information defined separately in wson-label-step and flexi-grid-label-step, to support optical network scenarios that contain both fixed- and flexi-grid links. See for more details.
transceiver-capabilities:: A YANG grouping to define the transceiver capabilities (also called "modes") needed to determine optical signal compatibility.
: When this grouping is used, the explicit-mode container shall be augmented with a leafref to an explicit mode template with the proper XPath which depends from where this grouping is actually used.

Examples of how the transceiver-capabilities grouping can be used and augmented with a leafref to an explicit mode template are provided in the YANG models defined in and .

standard-mode:: A YANG grouping for the standard modes defined in .
organizational-mode:: A YANG grouping to define transponder operational mode supported by organizations or vendors, as defined in .
explicit-mode:: A YANG grouping to define the list of attributes related to optical impairments limits in case of transceiver explicit mode, as defined in .
: Note that the actual portion of the spectrum occupied by an OTSi is not explicitly reported within the explicit-mode parameters because it can be calculated using the available-baud-rate, the roll-off and the min-carrier-spacing attributes.
transceiver-tuning-range:: A YANG grouping that defines the transceiver tuning range, which includes the minimum and maximum tuning frequency, as well as the frequency tuning granularity.
common-organizational-explicit-mode:: A YANG grouping to define the common capabilities attributes limit range in case of operational mode and explicit mode.
modulation:: A base YANG identity to define the different modulation types, as defined in
snr:: A YANG data type used to represent an (Optical) Signal to Noise Ratio measured over 0.1 nm resolution bandwidth, as defined in
psd:: A YANG data type used to represent a Power Spectral Density (PSD), as defined in
penalty-value:: A YANG grouping to define the penalty value for multiple penalty types, such as Chromatic Dispersion (CD), Polarization Mode Dispersion (PMD), as defined in or Polarization Dependent Loss(PDL)
switching-wson-lsc:: A YANG identity for the Wavelength Switched Optical Network Lambda-Switch Capable (WSON-LSC) interface switching capability as defined in .
switching-flexi-grid-lsc:: A YANG identity for the Flexi-Grid Lambda-Switch Capable (Flexi-Grid-LSC) interface switching capability as defined in .

It is worth noting that there is an inheritance relationship between the Lambda-Switch Capable (LSC) switching capability, defined in , and the WSON-LSC and Flexi-Grid-LSC, defined respectively in and . As a consequence, the 'switching-wson-lsc' and 'switching-flexi-grid-lsc' YANG identities are defined as derived identities from the 'switching-lsc', defined in .

WDM Label and Label Range As described in and , the WDM label represents the frequency slots assigned to a WDM Label Switched Path (LSP) on a given WDM Link, which models an Optical Multiplex Section (OMS) Media Channel Group (MCG) as described in . The same WDM label (which represents the frequency slots associated to the WDM LSP) will be assigned on all the WDM Links along a regen-free LSP path or path segment (i.e., an LSP path or path segment which does not include any 3R regenerator). Depending on the 3R capabilities, the WDM label may or may not change at a 3R regenerator: see for more details on 3R regenerators. A frequency slot is defined in as a contiguous frequency range characterized by its nominal central frequency and slot width. The frequency range allocated to a frequency slot is unavailable to other frequency slots. The definition of the frequency slot depends on the WDM grid type: In case of CWDM fixed-grid, defined in , the frequency slot is defined by a fixed CWDM channel spacing (cwdm-ch-spc-type) and by the nominal central wavelength which is computed as described in . The formula in is copied here for reader convenience:

where 'n' is defined in as integer (positive, negative, or 0)

In case of DWDM fixed-grid, defined in , the frequency slot is defined by a fixed DWDM channel spacing (dwdm-ch-spc-type) and by the nominal central frequency, which is computed as described in . The formula in is copied here for reader convenience:

where 'n' is defined in as integer (positive, negative, or 0)

In case of DWDM flexible-grid, defined in , the frequency slot is defined by the slot width and by the nominal central frequency, which are computed, based on the slot width granularity (SWG, fixed at 12.5GHz in ), and of the nominal central frequency granularity (NCFG, fixed at 6.25GHz in ) respectively, as described in and . The formulas in can be generalized as follows:

where 'n' is defined in as integer (positive, negative, or 0) and 'm' is defined in as an integer greater than or equal to 1.

The definition of the channel spacing, NCFG and SWG in the YANG model have been generalized to support modelling of vendor-specific values (e.g., finer vendor-specific granularity for NCFG and SWG). The WDM Label Range represents the frequency slots that are available for WDM LSPs to be set up over a given WDM Link. The WDM Label Range is defined by augmenting the label-restriction list, defined in , with WDM technology-specific attributes, using the l0-label-range-info grouping (for WSON only models) or the flexi-grid-label-range-info grouping (for DWDM flexible-grid only models) or the wdm-label-range-info grouping (for models that supports both WSON and DWDM flexible-grid). Each entry in the label-restriction list represents either the range of the available central wavelength values (in case of CWDM fixed-grid) or the range of the available nominal central frequencies values (in case of DWDM fixed or flexible grids): the grid-type attribute defines the type of grid for each entry of the list. In case of DWDM flexible grid, each entry in the label-restriction list represents also the range of the supported slot width values based on the following attributes, defined based on concepts used in : slot-width-granularity, which represents the minimum space between slot widths; min-slot-width-factor: a multiplier of the slot width granularity, indicating the minimum slot width supported by each entry in the label-restriction list; max-slot-width-factor: a multiplier of the slot width granularity, indicating the maximum slot width supported by each entry in the label-restriction list. Each entry of the label-restriction list, as defined in , defines a label-start, a label-end, a label-step and a range-bitmap. The label-start and label-end definitions, when used for representing WDM label range, are augmented with WDM technology-specific attributes, using the wson-label-start-end grouping (for WSON only models) or the flexi-grid-label-start-end grouping (for DWDM flexible-grid only models) or the wdm-label-start-end grouping (for models that supports both WSON and DWDM flexible-grid). The label-step definition, when used for representing WDM label range, are augmented with WDM technology-specific attributes, using the wson-label-step grouping (for WSON only models) or the flexi-grid-label-step grouping (for DWDM flexible-grid only models) or the wdm-label-step grouping (for models that supports both WSON and DWDM flexible-grid). The label-step definition for WDM depends on the WDM grid type: For CWDM and DWDM fixed grids, it describes the channel spacing, as defined in ; For DWDM flexible grids, it describes the nominal central frequency granularity (e.g., 6,25 GHz) as well as the multiplier for the supported values of n, as defined in .

YANG Module for Layer 0 Types This YANG module references , , , , , , , , , , , , , , , and .

WG List: Editor: Dieter Beller Editor: Sergio Belotti Editor: Italo Busi Editor: Haomian Zheng "; description "This module defines Optical Layer 0 types. This module provides groupings that can be applicable to Layer 0 Fixed Optical Networks (e.g., CWDM (Coarse Wavelength Division Multiplexing) and DWDM (Dense Wavelength Division Multiplexing)) and flexi-grid optical networks. Copyright (c) 2025 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices. The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED', 'MAY', and 'OPTIONAL' in this document are to be interpreted as described in BCP 14 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; // RFC Ed.: replace XXXX with actual RFC number and remove // this note // replace the revision date with the module publication date // the format is (year-month-day) revision 2025-06-06 { description "To be updated"; reference "RFC XXXX: A YANG Data Model for Layer 0 Types"; } revision 2021-08-13 { description "Initial version"; reference "RFC 9093: A YANG Data Model for Layer 0 Types"; } /* * Identities */ identity l0-grid-type { description "Layer 0 grid type"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC), Label Switching Routers, ITU-T G.694.2 (12/2003): Spectral grids for WDM applications: CWDM wavelength grid"; } identity wson-grid-cwdm { base l0-grid-type; description "CWDM grid"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.2 (12/2003): Spectral grids for WDM applications: CWDM wavelength grid"; } identity wson-grid-dwdm { base l0-grid-type; description "DWDM grid"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC), Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity flexi-grid-dwdm { base l0-grid-type; description "Flexi-grid"; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity cwdm-ch-spc-type { description "CWDM channel-spacing type"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.2 (12/2003): Spectral grids for WDM applications: CWDM wavelength grid"; } identity cwdm-20nm { base cwdm-ch-spc-type; description "20nm channel spacing"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.2 (12/2003): Spectral grids for WDM applications: CWDM wavelength grid"; } identity dwdm-ch-spc-type { description "DWDM channel-spacing type"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity dwdm-100ghz { base dwdm-ch-spc-type; description "100 GHz channel spacing"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity dwdm-50ghz { base dwdm-ch-spc-type; description "50 GHz channel spacing"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity dwdm-25ghz { base dwdm-ch-spc-type; description "25 GHz channel spacing"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity dwdm-12p5ghz { base dwdm-ch-spc-type; description "12.5 GHz channel spacing"; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity flexi-ch-spc-type { status deprecated; description "Flexi-grid channel-spacing type"; } identity flexi-ch-spc-6p25ghz { base flexi-ch-spc-type; status deprecated; description "6.25 GHz channel spacing"; } identity flexi-ncfg-type { description "Flexi-grid Nominal Central Frequency Granularity (NCFG) type"; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity flexi-ncfg-6p25ghz { base flexi-ncfg-type; description "6.25 GHz Nominal Central Frequency Granularity (NCFG)"; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity flexi-slot-width-granularity { description "Flexi-grid slot width granularity"; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity flexi-swg-12p5ghz { base flexi-slot-width-granularity; description "12.5 GHz slot width granularity"; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity modulation { description "base identity for modulation type"; } identity DPSK { base modulation; description "DPSK (Differential Phase Shift Keying) modulation"; } identity QPSK { base modulation; description "QPSK (Quadrature Phase Shift Keying) modulation"; } identity DP-QPSK { base modulation; description "DP-QPSK (Dual Polarization Quadrature Phase Shift Keying) modulation"; } identity QAM8 { base modulation; description "8QAM (8 symbols Quadrature Amplitude Modulation)"; } identity DP-QAM8 { base modulation; description "DP-QAM8 (8 symbols Dual Polarization Quadrature Amplitude Modulation)"; } identity QAM16 { base modulation; description "QAM16 (16 symbols Quadrature Amplitude Modulation)"; } identity DP-QAM16 { base modulation; description "DP-QAM16 (16 symbols Dual Polarization Quadrature Amplitude Modulation)"; } identity QAM32 { base modulation; description "QAM32 (32 symbols Quadrature Amplitude Modulation)"; } identity DP-QAM32 { base modulation; description "DP-QAM32 (32 symbols Dual Polarization Quadrature Amplitude Modulation)"; } identity QAM64 { base modulation; description "QAM64 (64 symbols Quadrature Amplitude Modulation)"; } identity DP-QAM64 { base modulation; description "DP-QAM64 (64 symbols Dual Polarization Quadrature Amplitude Modulation)"; } identity fec-type { description "Base identity from which specific FEC (Forward Error Correction) type identities are derived."; } identity g-fec { base fec-type; description "Generic Forward Error Correction (G-FEC)."; reference "ITU-T G.975 v2.0 (10/2000): Forward error correction for submarine systems."; } identity super-fec { base fec-type; description "Super Forward Error Correction (S-FEC)."; reference "ITU-T G.975.1 v1.2 (07/2013): Forward error correction for high bit-rate DWDM submarine systems."; } identity no-fec { base fec-type; description "No FEC"; } identity sc-fec { base fec-type; description "Staircase Forward Error Correction (SC-FEC)."; reference "Annex A of ITU-T G.709.2 v1.1 (09/2020):OTU4 long-reach interface."; } identity o-fec { base fec-type; description "Open Forward Error Correction (O-FEC) which reuses the Bose, Chaudhuri and Hocquenghem (BCH) FEC."; reference "Clause 16.4.4 of ITU-T G.709.3 v2.1 (11/2022): Flexible OTN long-reach interfaces; Annex E of ITU-T G.709.3 v2.1 (11/2022): Flexible OTN long-reach interfaces."; } identity c-fec { base fec-type; description "Concatenated FEC (C-FEC) that combines an outer Staircase Forward Error Correction (SC-FEC) code and an inner double-extended SD-FEC (128,119) Hamming code. More details are provided in clause 15/G.709.3 where it is called DSH instead of concatenated FEC."; reference "Annex A of ITU-T G.709.2 v1.1 (09/2020):OTU4 long-reach interface; Annex D of ITU-T G.709.3 v2.1 (11/2022): Flexible OTN long-reach interfaces; Clause 15 of ITU-T G.709.3 v2.1 (11/2022): Flexible OTN long-reach interfaces."; } identity line-coding { description "Base identity to defined the bit rate/line coding of optical tributary signals."; reference "Section 7.1.2 of ITU-T G.698.2 v3.0 (11/2018)."; } identity line-coding-NRZ-2p5G { base line-coding; description "The non return to zero (NRZ) bit rate/line coding used by the optical tributary signal class NRZ 2.5G"; reference "Section 3.2.6 of ITU-T G.959.1 v8.0 (07/2018)."; } identity line-coding-NRZ-OTU1 { base line-coding; description "The non return to zero (NRZ) bit rate/line coding used by the Optical channel Transport Unit order 1 (OTU1) optical tributary signals"; reference "Section 7.2.1.2 of ITU-T G.959.1 v8.0 (07/2018)."; } identity line-coding-NRZ-10G { description "The non return to zero (NRZ) bit rate/line coding used by the optical tributary signal class NRZ 10G"; reference "Section 3.2.7 of ITU-T G.959.1 v8.0 (07/2018)."; } identity line-coding-NRZ-OTU2 { base line-coding; description "The non return to zero (NRZ) bit rate/line coding used by the Optical channel Transport Unit order 2 (OTU2) optical tributary signals"; reference "Section 7.2.1.2 of ITU-T G.959.1 v8.0 (07/2018)."; } identity line-coding-OTL4.4-SC { base line-coding; description "The bit rate/line coding used by optical tributary signals carrying a 100G Optical Transport Unit order 4 (OTU4) with Staircase Forward Error Correction (SC FEC) from a group of four Optical Transport Lanes (OTL)."; reference "Section 3.2.1 of ITU-T G.698.2 v3.0 (11/2018)."; } identity line-coding-FOIC1.4-SC { base line-coding; description "The bit rate/line coding used by optical tributary signals carrying a FlexO Interface of order C1 with 4 lanes (FOIC1.1) with Staircase Forward Error Correction (SC FEC)."; reference "Section 3.2.1 of ITU-T G.698.2 v3.0 (11/2018)."; } identity wavelength-assignment { description "Wavelength selection base"; reference "RFC 7689: Signaling Extensions for Wavelength Switched Optical Networks"; } identity first-fit-wavelength-assignment { base wavelength-assignment; description "All the available wavelengths are numbered, and this WA (Wavelength Assignment) method chooses the available wavelength with the lowest index"; reference "RFC 7689: Signaling Extensions for Wavelength Switched Optical Networks"; } identity random-wavelength-assignment { base wavelength-assignment; description "This WA method chooses an available wavelength randomly"; reference "RFC 7689: Signaling Extensions for Wavelength Switched Optical Networks"; } identity least-loaded-wavelength-assignment { base wavelength-assignment; description "This WA method selects the wavelength that has the largest residual capacity on the most loaded link along the route (in multi-fiber networks)"; reference "RFC 7689: Signaling Extensions for Wavelength Switched Optical Networks"; } identity lower-first-wavelength-assignment { base wavelength-assignment; description "Allocate wavelengths in ascending order, beginning from the lowest frequency and progressing toward the highest frequency within the permissible frequency range."; } identity upper-first-wavelength-assignment { base wavelength-assignment; description "Allocate wavelengths in decending order, beginning from the highest frequency and progressing toward the lowest frequency within the permissible frequency range."; } identity type-power-mode { description "power equalization mode used within the OMS and its elements"; } identity power-spectral-density { base type-power-mode; description "all elements must use power spectral density (W/Hz)"; } identity carrier-power { base type-power-mode; description "all elements must use power (dBm)"; } identity switching-wson-lsc { base te-types:switching-lsc; description "Wavelength Switched Optical Network Lambda-Switch Capable (WSON-LSC)."; reference "Section 3 of RFC 7688: GMPLS OSPF Enhancement for Signal and Network Element Compatibility for Wavelength Switched Optical Networks"; } identity switching-flexi-grid-lsc { base te-types:switching-lsc; description "Flexi-grid Lambda-Switch Capable (Flexi-Grid-LSC)."; reference "Section 4.1 of RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } /* * Typedefs */ typedef dwdm-n { type int16; description "The given value 'N' is used to determine the nominal central frequency. The nominal central frequency, 'f', is defined by: f = 193100.000 GHz + N x channel spacing (measured in GHz), where 193100.000 GHz (193.100000 THz) is the ITU-T 'anchor frequency' for transmission over the DWDM grid, and where 'channel spacing' is defined by the dwdm-ch-spc-type."; reference "RFC6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } typedef cwdm-n { type int16; description "The given value 'N' is used to determine the nominal central wavelength. The nominal central wavelength is defined by: Wavelength = 1471 nm + N x channel spacing (measured in nm) where 1471 nm is the conventional 'anchor wavelength' for transmission over the CWDM grid, and where 'channel spacing' is defined by the cwdm-ch-spc-type."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.2 (12/2003): Spectral grids for WDM applications: CWDM wavelength grid"; } typedef flexi-n { type int16; description "The given value 'N' is used to determine the nominal central frequency. The nominal central frequency, 'f', is defined by: f = 193100.000 GHz + N x NCFG (measured in GHz), where 193100.000 GHz (193.100000 THz) is the ITU-T 'anchor frequency' for transmission over the DWDM grid, and where NCFG is defined by the flexi-ncfg-type, or by the deprecated flexi-ch-spc-type."; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } typedef flexi-m { type uint16; description "The given value 'M' is used to determine the slot width. A slot width is defined by: slot width = M x SWG (measured in GHz), where SWG is defined by the flexi-slot-width-granularity."; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers, ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } typedef standard-mode { type string; description "Identifies an ITU-T G.698.2 standard application code. It MUST be a string with a format that follows the nomenclature defined in section 5.3 of ITU-T G.698.2."; reference "ITU-T G.698.2 (11/2018)"; } typedef organization-identifier { type string; description "vendor/organization identifier that uses a private mode out of already defined in G.698.2 ITU-T application-code"; reference "Section 2.5.2 of RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; } // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC typedef operational-mode { type string; description "Identifies an organization (e.g., vendor) specific mode. The format of the string has to be defined by the organization which is responsible for defining the corresponding optical interface specification."; reference "Section 2.5.2 of RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; } // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC typedef frequency-thz { type decimal64 { fraction-digits 9; } units "THz"; description "The DWDM frequency in THz, e.g., 193.112500000"; } typedef frequency-ghz { type decimal64 { fraction-digits 6; } units "GHz"; description "The DWDM frequency in GHz, e.g., 193112.500000"; } typedef snr { type decimal-2; units "dB@0.1nm"; description "(Optical) Signal to Noise Ratio measured over 0.1 nm resolution bandwidth"; reference "ITU-T G.977.1 (02/2021): Transverse compatible dense wavelength division multiplexing applications for repeatered optical fibre submarine cable systems"; } typedef snr-or-null { type union { type snr; type empty; } description "(Optical) Signal to Noise Ratio measured over 0.1 nm resolution bandwidth, when known, or an empty value when unknown."; } typedef fiber-type { type enumeration { enum G.652 { description "G.652 Standard Singlemode Fiber"; } enum G.654 { description "G.654 Cutoff Shifted Fiber"; } enum G.653 { description "G.653 Dispersion Shifted Fiber"; } enum G.655 { description "G.655 Non-Zero Dispersion Shifted Fiber"; } enum G.656 { description "G.656 Non-Zero Dispersion for Wideband Optical Transport"; } enum G.657 { description "G.657 Bend-Insensitive Fiber"; } } description "ITU-T based fiber-types"; } typedef decimal-2 { type decimal64 { fraction-digits 2; } description "A decimal64 value with two digits."; } typedef decimal-2-or-null { type union { type decimal-2; type empty; } description "A decimal64 value with two digits, when the value is known or an empty value when the value is not known."; } typedef power-gain { type decimal-2 { range "0..max"; } units "dB"; description "The gain in dB."; } typedef power-gain-or-null { type union { type power-gain; type empty; } description "The gain in dB, when it is known or an empty value when the power gain/loss is not known."; } typedef power-loss { type decimal-2 { range "0..max"; } units "dB"; description "The power attenuation in dB."; } typedef power-loss-or-null { type union { type power-loss; type empty; } description "The power attenuation in dB, when it is known or an empty value when the loss is not known."; } typedef power-ratio { type decimal-2; units "dB"; description "The power difference in dB."; } typedef power-ratio-or-null { type union { type power-ratio; type empty; } description "The power difference in dB, when it is known or an empty value when the difference is not known."; } typedef power-dbm { type decimal-2; units "dBm"; description "The power in dBm."; } typedef power-dbm-or-null { type union { type power-dbm; type empty; } description "The power in dBm, when it is known or an empty value when the power is not known."; } typedef decimal-5 { type decimal64 { fraction-digits 5; } description "A decimal64 value with five digits."; } typedef decimal-5-or-null { type union { type decimal-5; type empty; } description "A decimal64 value with five digits, when the value is known or an empty value when the value is not known."; } typedef psd { type decimal64 { fraction-digits 16; } units "W/Hz"; description "The power spectral density (PSD). Typical value : 3.9 E-14, resolution 0.1nW/MHz."; reference "ITU-T G.9700 (07/2019): Fast access to subscriber terminals (G.fast) - Power spectral density specification"; } typedef psd-or-null { type union { type psd; type empty; } description "The power spectral density (PSD), when it is known or an empty value when the PSD is not known."; } typedef decimal-18 { type decimal64 { fraction-digits 18; } description "A decimal64 value with eighteen digits."; } typedef decimal-18-or-null { type union { type decimal-18; type empty; } description "A decimal64 value with eighteen digits, when the value is known or an empty value when the value is not known."; } /* * Groupings */ grouping wdm-label-start-end { description "The WDM label-start or label-end used to specify DWDM and CWDM label range."; choice grid-type { description "Label for fixed & flexi-DWDM or CWDM grid"; case fixed-dwdm { leaf dwdm-n { when "derived-from-or-self(../../../grid-type, \"wson-grid-dwdm\")" { description "Valid only when grid type is DWDM."; } type dwdm-n; description "The given value 'N' is used to determine the nominal central frequency."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } case cwdm { leaf cwdm-n { when "derived-from-or-self(../../../grid-type, \"wson-grid-cwdm\")" { description "Valid only when grid type is CWDM."; } type cwdm-n; description "The given value 'N' is used to determine the nominal central wavelength."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } case flexi-grid { uses flexi-grid-label-start-end; } } reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } grouping wdm-label-step { description "Label step information for fixed & flexi-DWDM or CWDM grid"; choice l0-grid-type { description "Grid type: DWDM, CWDM, etc."; case fixed-dwdm { leaf wson-dwdm-channel-spacing { when "derived-from-or-self(../../grid-type, \"wson-grid-dwdm\")" { description "Valid only when grid type is DWDM."; } type identityref { base dwdm-ch-spc-type; } description "Label-step is the channel spacing (GHz), e.g., 100.000, 50.000, 25.000, or 12.500 GHz for DWDM."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } case cwdm { leaf wson-cwdm-channel-spacing { when "derived-from-or-self(../../grid-type, \"wson-grid-cwdm\")" { description "Valid only when grid type is CWDM."; } type identityref { base cwdm-ch-spc-type; } description "Label-step is the channel spacing (nm), i.e., 20 nm for CWDM, which is the only value defined for CWDM."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } case flexi-grid { uses flexi-grid-label-step; } } reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.2 (12/2003): Spectral grids for WDM applications: CWDM wavelength grid, RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } grouping wdm-label-hop { description "Generic label-hop information for fixed & flexi-DWDM or CWDM grid"; choice grid-type { description "Label for DWDM or CWDM grid"; case fixed-dwdm { choice fixed-single-or-super-channel { description "single or super channel"; case single { leaf dwdm-n { type dwdm-n; description "The given value 'N' is used to determine the nominal central frequency."; } } case multi { leaf-list subcarrier-dwdm-n { type dwdm-n; min-elements 2; description "The given values 'N' are used to determine the nominal central frequency for each subcarrier channel."; reference "ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } } } } case cwdm { leaf cwdm-n { type cwdm-n; description "The given value 'N' is used to determine the nominal central wavelength."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } case flexi-grid { uses flexi-grid-label-hop; } } reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } grouping wdm-label-range-info { description "WDM label range related information"; uses l0-label-range-info; container flexi-grid { when "derived-from-or-self(../grid-type, \"flexi-grid-dwdm\")" { description "Applicable only when the grid type is flexi-grid-dwdm."; } description "flexi-grid definition"; leaf slot-width-granularity { type identityref { base flexi-slot-width-granularity; } default "flexi-swg-12p5ghz"; description "Minimum space between slot widths. Default is 12.500 GHz."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi- Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } leaf min-slot-width-factor { type uint16 { range "1..max"; } default "1"; description "A multiplier of the slot width granularity, indicating the minimum slot width supported by an optical port. Minimum slot width is calculated by: Minimum slot width (GHz) = min-slot-width-factor * slot-width-granularity."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi- Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } leaf max-slot-width-factor { type uint16 { range "1..max"; } must '. >= ../min-slot-width-factor' { error-message "Maximum slot width must be greater than or equal to minimum slot width."; } description "A multiplier of the slot width granularity, indicating the maximum slot width supported by an optical port. Maximum slot width is calculated by: Maximum slot width (GHz) = max-slot-width-factor * slot-width-granularity If specified, maximum slot width must be greater than or equal to minimum slot width. If not specified, maximum slot width is equal to minimum slot width."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi- Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } } } grouping wson-label-start-end { description "The WSON label-start or label-end used to specify WSON label range."; choice grid-type { description "Label for DWDM or CWDM grid"; case dwdm { leaf dwdm-n { when "derived-from-or-self(../../../grid-type, \"wson-grid-dwdm\")" { description "Valid only when grid type is DWDM."; } type dwdm-n; description "The central frequency of DWDM."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } case cwdm { leaf cwdm-n { when "derived-from-or-self(../../../grid-type, \"wson-grid-cwdm\")" { description "Valid only when grid type is CWDM."; } type cwdm-n; description "Channel wavelength computing input."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } } reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } grouping wson-label-hop { description "Generic label-hop information for WSON"; choice grid-type { description "Label for DWDM or CWDM grid"; case dwdm { choice single-or-super-channel { description "single or super channel"; case single { leaf dwdm-n { type dwdm-n; description "The given value 'N' is used to determine the nominal central frequency."; } } case super { leaf-list subcarrier-dwdm-n { type dwdm-n; description "The given values 'N' are used to determine the nominal central frequency for each subcarrier channel."; reference "ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } } } } case cwdm { leaf cwdm-n { type cwdm-n; description "The given value 'N' is used to determine the nominal central wavelength."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } } reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } grouping l0-label-range-info { description "Information about Layer 0 label range."; leaf grid-type { type identityref { base l0-grid-type; } description "Grid type"; } leaf priority { type uint8; description "Priority in Interface Switching Capability Descriptor (ISCD)."; reference "RFC 4203: OSPF Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)"; } reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } grouping wson-label-step { description "Label step information for WSON"; choice l0-grid-type { description "Grid type: DWDM, CWDM, etc."; case dwdm { leaf wson-dwdm-channel-spacing { when "derived-from-or-self(../../grid-type, \"wson-grid-dwdm\")" { description "Valid only when grid type is DWDM."; } type identityref { base dwdm-ch-spc-type; } description "Label-step is the channel spacing (GHz), e.g., 100.000, 50.000, 25.000, or 12.500 GHz for DWDM."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } case cwdm { leaf wson-cwdm-channel-spacing { when "derived-from-or-self(../../grid-type, \"wson-grid-cwdm\")" { description "Valid only when grid type is CWDM."; } type identityref { base cwdm-ch-spc-type; } description "Label-step is the channel spacing (nm), i.e., 20 nm for CWDM, which is the only value defined for CWDM."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } } } reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, ITU-T G.694.2 (12/2003): Spectral grids for WDM applications: CWDM wavelength grid"; } grouping flexi-grid-label-start-end { description "The flexi-grid label-start or label-end used to specify flexi-grid label range."; leaf flexi-n { type flexi-n; description "The given value 'N' is used to determine the nominal central frequency. As described in section 3.1 of RFC 8363, the range of available nominal central frequencies are advertised for m=1, which means that for an available central frequency n, the frequency slot from central frequency n-1 to central frequency n+1 is available."; } reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers, RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } grouping flexi-grid-frequency-slot { description "Flexi-grid frequency slot grouping."; uses flexi-grid-label-start-end; leaf flexi-m { type flexi-m; description "The given value 'M' is used to determine the slot width."; } reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers"; } grouping flexi-grid-label-hop { description "Generic label-hop information for flexi-grid"; choice single-or-super-channel { description "single or super channel"; case single { uses flexi-grid-frequency-slot; } case super { status deprecated; list subcarrier-flexi-n { key "flexi-n"; status deprecated; uses flexi-grid-frequency-slot { status deprecated; } description "List of subcarrier channels for flexi-grid super channel."; } } case multi { container frequency-slots { description "The top level container for the list of frequency slots used for flexi-grid super channel."; list frequency-slot { key "flexi-n"; min-elements 2; uses flexi-grid-frequency-slot; description "List of frequency slots used for flexi-grid super channel."; } } } } reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } grouping flexi-grid-label-range-info { description "Flexi-grid-specific label range related information"; uses l0-label-range-info; container flexi-grid { description "flexi-grid definition"; leaf slot-width-granularity { type identityref { base flexi-slot-width-granularity; } default "flexi-swg-12p5ghz"; description "Minimum space between slot widths. Default is 12.500 GHz."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } leaf min-slot-width-factor { type uint16 { range "1..max"; } default "1"; description "A multiplier of the slot width granularity, indicating the minimum slot width supported by an optical port. Minimum slot width is calculated by: Minimum slot width (GHz) = min-slot-width-factor * slot-width-granularity."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi- Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } leaf max-slot-width-factor { type uint16 { range "1..max"; } must '. >= ../min-slot-width-factor' { error-message "Maximum slot width must be greater than or equal to minimum slot width."; } description "A multiplier of the slot width granularity, indicating the maximum slot width supported by an optical port. Maximum slot width is calculated by: Maximum slot width (GHz) = max-slot-width-factor * slot-width-granularity If specified, maximum slot width must be greater than or equal to minimum slot width. If not specified, maximum slot width is equal to minimum slot width."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi- Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } } } grouping flexi-grid-label-step { description "Label step information for flexi-grid"; leaf flexi-grid-channel-spacing { type identityref { base flexi-ch-spc-type; } default "flexi-ch-spc-6p25ghz"; status deprecated; description "Label-step is the nominal central frequency granularity (GHz), e.g., 6.25 GHz."; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers"; } leaf flexi-ncfg { type identityref { base flexi-ncfg-type; } default "flexi-ncfg-6p25ghz"; description "Label-step is the nominal central frequency granularity (GHz), e.g., 6.25 GHz."; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers"; } leaf flexi-n-step { type uint8; description "This attribute defines the multiplier for the supported values of 'N'. For example, given a grid with a nominal central frequency granularity of 6.25 GHz, the granularity of the supported values of the nominal central frequency could be 12.5 GHz. In this case, the values of flexi-n should be even and this constraint is reported by setting the flexi-n-step to 2. This attribute is also known as central frequency granularity in RFC 8363."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } } grouping transceiver-capabilities { description "This grouping is intended to be used for reporting the capabilities of a transceiver. When this grouping is used, the explicit-mode container shall be augmented with a leafref to an explicit mode template with the proper XPath which depends from where this grouping is actually used. See for example the ietf-optical-impairment-topology YANG module in RFC YYYY."; reference "RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC container supported-modes { presence "When present, it indicates that the modes supported by a transceiver are reported."; config false; description "The top level container for the list supported transceiver's modes."; list supported-mode { key "mode-id"; config false; min-elements 1; description "The list of supported transceiver's modes."; leaf mode-id { type string { length "1..255"; } description "ID for the supported transceiver's mode."; } choice mode { config false; mandatory true; description "Indicates whether the transceiver's mode is a standard mode, an organizational mode or an explicit mode."; case G.698.2 { uses standard-mode; uses common-standard-organizational-mode; uses common-all-modes; } case organizational-mode { container organizational-mode { config false; description "The set of attributes for an organizational mode"; uses organizational-mode; uses common-standard-organizational-mode; uses common-all-modes; } // container organizational-mode } case explicit-mode { container explicit-mode { config false; description "The set of attributes for an explicit mode."; uses common-all-modes; container compatible-modes { description "Container for all the standard and organizational modes supported by the transceiver's explicit mode."; leaf-list supported-application-code { type leafref { path "../../../../supported-mode/mode-id"; } must "../../../../" + "supported-mode[mode-id=current()]/" + "standard-mode" { description "The pointer is only for application codes supported by transceiver."; } description "List of pointers to the application codes supported by the transceiver's explicit mode."; } leaf-list supported-organizational-mode { type leafref { path "../../../../supported-mode/mode-id"; } must "../../../../" + "supported-mode[mode-id=current()]/" + "organizational-mode" { description "The pointer is only for organizational modes supported by transceiver."; } description "List of pointers to the organizational modes supported by the transceiver's explicit mode."; } } // container compatible-modes } // container explicit-mode } // end of case explicit-mode } // end of choice } // list supported-mode } // container supported-modes } // grouping transceiver-capabilities grouping standard-mode { description "ITU-T G.698.2 standard mode that guarantees interoperability. It must be an string with the following format: B-DScW-ytz(v) where all these attributes are conformant to the ITU-T recomendation"; leaf standard-mode { type standard-mode; config false; description "G.698.2 standard mode"; } } grouping organizational-mode { description "Transponder operational mode supported by organizations or vendor"; leaf operational-mode { type operational-mode; config false; description "configured organization- or vendor-specific application identifiers (AI) supported by the transponder"; } leaf organization-identifier { type organization-identifier; config false; description "organization identifier that uses organizational mode"; } } grouping penalty-value { description "A common definition of the OSNR penalty value used for describing multiple penalty types (.e.g, CD, PMD, PDL)."; leaf penalty-value { type union { type decimal-2 { range "0..max"; } type empty; } units "dB"; config false; mandatory true; description "The OSNR penalty associated with the related optical impairment at the receiver, when the value is known or an empty value when the value is not known."; } } grouping explicit-mode { description "Attributes capabilities related to explicit transceiver's mode. This grouping also contains the list of attributes related to optical impairment limits for explicit mode (min OSNR, max PMD, max CD, max PDL, Q-factor limit, etc.). In case of standard and operational mode the attributes are implicit."; leaf line-coding-bitrate { type identityref { base line-coding; } config false; description "Bit rate/line coding of the optical tributary signal."; reference "ITU-T G.698.2 section 7.1.2"; } leaf bitrate { type uint16; units "Gbit/sec"; config false; description "The gross bitrate (e.g., 100, 200) of the optical tributary signal."; } leaf max-diff-group-delay { type decimal-2; units "ps"; config false; description "Maximum Differential group delay of this mode for this lane"; } leaf max-chromatic-dispersion { type decimal-2 { range "0..max"; } units "ps/nm"; config false; description "Maximum acceptable accumulated chromatic dispersion (CD) on the receiver at Rx-power reference point (rx-ref-channel-power) and in absence of other impairments"; reference "Section 2.6.4 of RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; } // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC list cd-penalty { key cd-value; config false; description "Optional penalty associated with a given accumulated chromatic dispersion (CD) value measured in absence of other impairments. This list of pair CD and OSNR penalty can be used to sample the function OSNR penalty = f(CD)."; leaf cd-value { type decimal-2; units "ps/nm"; config false; mandatory true; description "The Chromatic Dispersion (CD)."; } uses penalty-value; reference "Section 2.6.4 of RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; } // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC leaf max-polarization-mode-dispersion { type decimal-2 { range "0..max"; } units "ps"; config false; description "Maximum acceptable accumulated polarization mode dispersion (PMD) on the receiver at Rx-power reference point (rx-ref-channel-power) and in absence of other impairments"; reference "ITU-T G.666 (02/2011): Characteristics of polarization mode dispersion compensators and of receivers that compensate for polarization mode dispersion Section 2.6.4 of RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; } // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC list pmd-penalty { key pmd-value; config false; description "Optional penalty associated with a given accumulated polarization mode dispersion (PMD) value measured in absence of other impairments. This list of pair PMD and OSNR penalty can be used to sample the function OSNR penalty = f(PMD)."; leaf pmd-value { type decimal-2 { range "0..max"; } units "ps"; config false; mandatory true; description "The Polarization Mode Dispersion (PMD)."; } uses penalty-value; reference "Section 2.6.4 of RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; } // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC leaf max-polarization-dependent-loss { type power-loss-or-null; config false; mandatory true; description "Maximum acceptable accumulated polarization dependent loss (PDL) on the receiver at Rx-power reference point (rx-ref-channel-power) and in absence of other impairments"; reference "Section 2.6.4 of RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; } // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC list pdl-penalty { key pdl-value; config false; description "Optional penalty associated with a given accumulated polarization dependent loss (PDL) value, measured in absence of other impairments. This list of pair PDL and OSNR penalty can be used to sample the function OSNR penalty = f(PDL)."; leaf pdl-value { type power-loss; config false; mandatory true; description "Maximum acceptable accumulated polarization dependent loss (PDL)."; } uses penalty-value; reference "Section 2.6.4 of RFC YYYY: A YANG Data Model for Optical Impairment-aware Topology."; } // RFC Ed.: replace YYYY with actual RFC number and remove // this note after draft-ietf-ccamp-optical-impairment-topology-yang // is published as an RFC leaf available-modulation-type { type identityref { base modulation; } config false; description "Modulation type the specific transceiver in the list can support"; } leaf min-OSNR { type snr; units "dBm"; config false; description "min OSNR measured over 0.1 nm resolution bandwidth: if received OSNR at Rx-power reference point (rx-ref-channel-power) is lower than MIN-OSNR, an increased level of bit-errors post-FEC needs to be expected"; } leaf rx-ref-channel-power { type power-dbm; config false; description "The channel power used as reference for defining penalties and min-OSNR"; } list rx-channel-power-penalty { key rx-channel-power-value; config false; description "Optional penalty associated with a received power lower than rx-ref-channel-power. This list of pair power and OSNR penalty can be used to sample the function OSNR penalty = f(rx-channel-power)."; leaf rx-channel-power-value { type power-dbm; units "dBm"; config false; mandatory true; description "The Received Power."; } uses penalty-value; } leaf min-Q-factor { type decimal-2; units "dB"; config false; description "min Qfactor at FEC threshold"; } leaf available-baud-rate { type decimal64 { fraction-digits 1; } units "Bd"; config false; description "Baud-rate the specific transceiver in the list can support. Baud-rate is the unit for symbol rate or modulation rate in symbols per second or pulses per second. It is the number of distinct symbol changes (signal events) made to the transmission medium per second in a digitally modulated signal or a line code"; } leaf roll-off { type decimal64 { fraction-digits 4; range "0..1"; } config false; description "the roll-off factor (beta with values from 0 to 1) identifies how the real signal shape exceed the baud rate. If=0 it is exactly matching the baud rate.If=1 the signal exceeds the 50% of the baud rate at each side."; } leaf min-carrier-spacing { type frequency-ghz; config false; description "This attribute specifies the minimum nominal difference between the carrier frequencies of two homogeneous OTSis (which have the same optical characteristics but the central frequencies) such that if they are placed next to each other the interference due to spectrum overlap between them can be considered negligible. In case of heterogeneous OTSi it is up to path computation engine to determine the minimum distance between the carrier frequency of the two adjacent OTSi."; } leaf available-fec-type { type identityref { base fec-type; } config false; description "Available FEC"; } leaf fec-code-rate { type decimal64 { fraction-digits 8; range "0..max"; } config false; description "FEC-code-rate"; } leaf fec-threshold { type decimal64 { fraction-digits 8; range "0..max"; } config false; description "Threshold on the BER, for which FEC is able to correct errors"; } leaf in-band-osnr { type snr; config false; description "The OSNR defined within the bandwidth of the transmit spectral excursion (i.e., between the nominal central frequency of the channel and the -3.0dB points of the transmitter spectrum furthest from the nominal central frequency) measured at reference point Ss. The in-band OSNR is referenced to an optical bandwidth of 0.1nm @ 193.7 THz or 12.5 GHz."; reference "OIF-400ZR-01.0: Implementation Agreement 400ZR"; } leaf out-of-band-osnr { type snr; config false; description "The ratio of the peak transmitter power to the integrated power outside the transmitter spectral excursion. The spectral resolution of the measurement shall be better than the maximum spectral width of the peak. The out-of-band OSNR is referenced to an optical bandwidth of 0.1nm @ 193.7 THz or 12.5 GHz"; reference "OIF-400ZR-01.0: Implementation Agreement 400ZR"; } leaf tx-polarization-power-difference { type power-ratio; config false; description "The transmitter polarization dependent power difference defined as the power difference between X and Y polarizations"; reference "OIF-400ZR-01.0: Implementation Agreement 400ZR"; } leaf polarization-skew { type decimal-2; units "ps"; config false; description "The X-Y skew, included as a fixed value in the receiver polarization mode dispersion (PMD) tolerance limits."; reference "OIF-400ZR-01.0: Implementation Agreement 400ZR"; } } // grouping explicit-mode grouping common-standard-organizational-mode { description "Common attributes used by standard and organizational transceiver's modes."; leaf-list line-coding-bitrate { type identityref { base line-coding; } config false; description "The list of the bit rate/line coding of the optical tributary signal supported by the transceiver. Reporting this list is optional when the standard or organization mode supports only one bit rate/line coding."; reference "ITU-T G.698.2 section 7.1.2"; } } // grouping common-standard-organizational-mode grouping transceiver-tuning-range { description "Transceiver tuning range (f-min, f-max, f-granularity)"; leaf min-central-frequency { type frequency-thz; description "This parameter indicates the minimum frequency for the transceiver tuning range."; } leaf max-central-frequency { type frequency-thz; description "This parameter indicates the maximum frequency for the transceiver tuning range."; } leaf transceiver-tunability-granularity { type frequency-ghz; description "This parameter indicates the transceiver frequency fine tuning granularity e.g 3.125GHz or 0.001GHz."; } } // grouping transceiver-tuning-range grouping common-all-modes { description "Common attributes used by all transceiver's modes."; container transceiver-tuning-range { config false; description "Transceiver tuning range (f-min, f-max, f-granularity)"; uses transceiver-tuning-range; } leaf tx-channel-power-min { type power-dbm; config false; description "The minimum output power of this interface"; } leaf tx-channel-power-max { type power-dbm; config false; description "The maximum output power of this interface"; } leaf rx-channel-power-min { type power-dbm; config false; description "The minimum input power of this interface"; } leaf rx-channel-power-max { type power-dbm; config false; description "The maximum input power of this interface"; } leaf rx-total-power-max { type power-dbm; config false; description "Maximum rx optical power for all the channels. It is applicable only to multi-channel modes."; } } // grouping common-all-modes grouping common-transceiver-param { description "The common parameters of an optical transceiver, that supplement the configured mode."; uses common-transceiver-configured-param; uses common-transceiver-readonly-param; } grouping common-transceiver-configured-param { description "The configured parameters of an optical transceiver, that supplement the configured mode."; leaf line-coding-bitrate { type identityref { base line-coding; } description "Bit rate/line coding of the optical tributary signal. Support of this attribute is optional when the configured mode supports only one bit rate/line coding."; reference "ITU-T G.698.2 section 7.1.2"; } leaf tx-channel-power { type power-dbm-or-null; description "The current channel transmit power, when the value is known or an empty value when the value is not known. The empty value MUST NOT be used when this attribute is configured."; } } // grouping for configured transceiver attributes out of mode grouping common-transceiver-readonly-param { description "The common read-only parameters of an optical transceiver, that supplement the configured mode."; leaf rx-channel-power { type power-dbm-or-null; config false; description "The current channel received power, when the value is known or an empty value when the value is not known."; } leaf rx-total-power { type power-dbm-or-null; config false; description "The current total received power, when the value is known or an empty value when the value is not known."; } } // grouping for read-only transceiver attributes out of mode grouping tunnel-attributes { description "Parameters for Layer0 (WSON or Flexi-Grid) Tunnels."; leaf wavelength-assignment { type identityref { base wavelength-assignment; } description "Wavelength Allocation Method"; } } grouping frequency-range { description "This grouping defines the lower and upper bounds of a frequency range (e.g., a band). This grouping SHOULD NOT be used to define a frequency slot, which SHOULD be defined using the n and m values instead."; leaf lower-frequency { type frequency-thz; mandatory true; description "The lower frequency boundary of the frequency range."; } leaf upper-frequency { type frequency-thz; must '. > ../lower-frequency' { error-message "The upper frequency must be greater than the lower frequency."; } mandatory true; description "The upper frequency boundary of the frequency range."; } } grouping frequency-range-with-identifier { description "This grouping extends the frequency-range defined in ietf-layer0-types with an identifier, which used as a key when it is needed to define different properties (e.g., optical impairments) for different frequency ranges."; leaf frequency-range-id { type uint16; description "The identifier of the frequency range."; } container frequency-range { description "The frequency range for which these optical impairments apply."; uses frequency-range; } } grouping path-constraints { description "Common attribute for Layer 0 path constraints to be used by Layer 0 computation."; leaf gsnr-extra-margin { type snr { range 0..max; } default 0; description "An additional margin to be added to the OSNR-min of the transceiver when checking the estimated received Generalized SNR (GSNR)."; } } grouping path-properties { description "Common attribute for reporting the Layer 0 computed path properties."; leaf estimated-gsnr { type snr; config false; description "The estimate received GSNR for the computed path."; } leaf estimated-eol-gsnr { type snr; config false; description "The estimate received GSNR for the computed path degraded at the end of life."; } leaf estimated-lowest-gsnr { type snr; config false; description "The estimate lowest received GSNR for the computed path among all possible wavelength channels along the same path."; } } } ]]>