Common YANG Data Types for Layer 0 Optical 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.

Identities The "ietf-layer0-types" module contains the following YANG reusable YANG identities:

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 specific identities defining the Wavelength selection methods, as defined in , are derived.
modulation:: A base YANG identity to define the different modulation types, as defined in
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 .

Data Types The "ietf-layer0-types" module contains the following YANG reusable YANG data types:

operational-mode:: A YANG data type used to identify an organization (e.g., vendor) specific mode for transceiver capability description, 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

Reporting unknown values Some data types, whose identifiers are suffixed as "-or-unknown", are defined as a union with the data type 'unknown-value' (e.g., snr-or-unknown), which is defined as an enumeration having only one assigned name (i.e., 'unknown'). The unknown-value data type is used to report when the value is unknown in order to differentiate the case where an attribute is unknown from the case where an attribute is not applicable: if the value of a mandatory attribute is unknown, it MUST be reported using the unknown-value type; if an optional attribute is applicable but its value is unknown, it MUST be reported using the unknown-value type; if an optional attribute is not applicable to an entity, it MUST be omitted (not be present in the datastore).

Groupings The "ietf-layer0-types" module contains the following YANG reusable YANG groupings:

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 , the range of available nominal central frequencies is 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 the limits of the optical impairments, 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-all-modes:: A YANG grouping used to define the common attributes used by all transceiver's modes.
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)

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 with 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 support 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 also represents 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 support both WSON and DWDM flexible-grid). The label-step definition, when used for representing WDM label range, is 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 support 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) 2026 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). All revisions of IETF and IANA published modules can be found at the YANG Parameters registry group (https://www.iana.org/assignments/yang-parameters). 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."; revision 2026-06-12 { description "This revision adds the following new identities: - cwdm-ch-spc-type; - flexi-ncfg-type; - flexi-ncfg-6p25gh; - modulation; - dpsk; - qpsk; - dp-qpsk; - qam8; - dp-qam8; - qam16; - dp-qam16; - qam32; - dp-qam32; - qam64; - dp-qam64; - fec-type; - g-fec; - super-fec; - no-fec; - sc-fec; - o-fec; - c-fec; - line-coding; - nrz-2p5g; - nrz-otu1; - nrz-10g; - nrz-otu2; - otl4.4-sc; - foic1.4-sc; - wavelength-assignment; - first-fit-wavelength-assignment; - random-wavelength-assignment; - least-loaded-wavelength-assignment; - lower-first-wavelength-assignment; - upper-first-wavelength-assignment; - type-power-mode; - power-spectral-density; - carrier-power; - switching-wson-lsc; - switching-flexi-grid-lsc. This revision adds the following new data types: - standard-mode - organization-identifier - operational-mode - frequency-thz - frequency-ghz - unknown-value - snr - snr-or-unknown - decimal-2 - decimal-2-or-unknown - power-gain - power-gain-or-unknown - power-loss - power-loss-or-unknown - power-ratio - power-ratio-or-unknown - power-dbm - power-dbm-or-unknown - decimal-5 - decimal-5-or-unknown - psd - psd-or-unknown. This revision adds the following new groupings: - wdm-label-start-end; - wdm-label-step; - wdm-label-hop; - wdm-label-range-info; - transceiver-capabilities; - standard-mode; - organizational-mode; - penalty-value; - explicit-mode; - common-standard-organizational-mode; - transceiver-tuning-range; - common-all-mode; - common-transceiver-param; - common-transceiver-configured-param; - common-transceiver-readonly-param; - tunnel-attributes; - frequency-range; - frequency-range-with-identifier; - path-constraints; - path-properties. The default value of the min-slot-width-factor data node within flexi-grid-label-range-info grouping has been removed (bug fixing). "; reference "RFC XXXX: Common YANG Data Types for Layer 0 Optical Networks"; } revision 2021-08-13 { description "Initial version"; reference "RFC 9093: A YANG Data Model for Layer 0 Types"; } /* * Identities */ identity l0-grid-type { description "Base identity for the WDM grid types."; 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 "Coarse Wavelength Division Multiplexing (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 "Fixed Dense Wavelength Division Multiplexing (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, Clause 7."; } identity flexi-grid-dwdm { base l0-grid-type; description "Flexible Dense Wavelength Division Multiplexing (DWDM) grid (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, Clause 8"; } identity cwdm-ch-spc-type { description "Base identity for CWDM channel-spacing types."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, Section 3.3 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, Section 3.3 ITU-T G.694.2 (12/2003): Spectral grids for WDM applications: CWDM wavelength grid"; } identity dwdm-ch-spc-type { description "Base identity for DWDM channel-spacing types."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers, Section 3.2 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, Section 3.2 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, Section 3.2 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, Section 3.2 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, Section 3.2 ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } identity flexi-ch-spc-type { status obsolete; description "Flexi-grid channel-spacing type"; } identity flexi-ch-spc-6p25ghz { base flexi-ch-spc-type; status obsolete; 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 "Differential Phase Shift Keying (DPSK) modulation."; } identity qpsk { base modulation; description "Quadrature Phase Shift Keying (QPSK) modulation."; } identity dp-qpsk { base modulation; description "Dual Polarization Quadrature Phase Shift Keying (DP-QPSK) modulation."; } identity qam8 { base modulation; description "8 symbols Quadrature Amplitude Modulation (8QAM)."; } identity dp-qam8 { base modulation; description "8 symbols Dual Polarization Quadrature Amplitude Modulation (DP-QAM8)."; } identity qam16 { base modulation; description "16 symbols Quadrature Amplitude Modulation (QAM16)."; } identity dp-qam16 { base modulation; description "16 symbols Dual Polarization Quadrature Amplitude Modulation (DP-QAM16)."; } identity qam32 { base modulation; description "32 symbols Quadrature Amplitude Modulation (QAM32)"; } identity dp-qam32 { base modulation; description "32 symbols Dual Polarization Quadrature Amplitude Modulation (DP-QAM32)."; } identity qam64 { base modulation; description "64 symbols Quadrature Amplitude Modulation (QAM64)."; } identity dp-qam64 { base modulation; description "64 symbols Dual Polarization Quadrature Amplitude Modulation (DP-QAM64)."; } identity fec-type { description "Base identity from which specific Forward Error Correction (FEC) 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 v1.0 (02/2024): 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 v1.0 (07/2018):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 "ITU-T G.709.3 v3.0 (03/2024): Flexible OTN B100G long-reach interfaces, Clause 16.4.4 ITU-T G.709.3 v3.0 (03/2024): Flexible OTN B100G long-reach interfaces, Annex E"; } 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 G.709.3 where it is called DSH instead of concatenated FEC."; reference "ITU-T G.709.2 v1.0 (07/2018):OTU4 long-reach interface, Annex A ITU-T G.709.3 v3.0 (03/2024): Flexible OTN B100G long-reach interfaces, Annex D ITU-T G.709.3 v3.0 (03/2024): Flexible OTN B100G long-reach interfaces, Clause 15"; } identity line-coding { description "Base identity to define the bit rate/line coding of optical tributary signals."; reference "ITU-T G.698.2 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network, Clause 7.1.2"; } identity 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 "ITU-T G.959.1 v8.0 (07/2018): Optical transport network physical layer interfaces, Clause 3.2.6"; } identity 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 "ITU-T G.959.1 v8.0 (07/2018): Optical transport network physical layer interfaces, Clause 7.2.1.2"; } identity nrz-10g { description "The non return to zero (NRZ) bit rate/line coding used by the optical tributary signal class NRZ 10G."; reference "ITU-T G.959.1 v8.0 (07/2018): Optical transport network physical layer interfaces, Clause 3.2.7"; } identity 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 "ITU-T G.959.1 v8.0 (07/2018): Optical transport network physical layer interfaces, Clause 7.2.1.2"; } identity 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 "ITU-T G.698.2 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network, Clause 3.2.1"; } identity 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 "ITU-T G.698.2 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network, Clause 3.2.1"; } identity wavelength-assignment { description "Base identity for Wavelength Assignment (WA) method."; 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 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 descending 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 Optical Multiplex Section (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 "RFC 7688: GMPLS OSPF Enhancement for Signal and Network Element Compatibility for Wavelength Switched Optical Networks, Section 3"; } identity switching-flexi-grid-lsc { base te-types:switching-lsc; description "Flexi-grid Lambda-Switch Capable (Flexi-Grid-LSC)."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks, Section 4.1"; } /* * 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."; 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 clause 5.3 of ITU-T G.698.2."; reference "ITU-T G.698.2 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network, Clause 5.3"; } 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 "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.5.2"; } 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 "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.5.2"; } 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 unknown-value { type enumeration { enum unknown { description "The value is unknown."; } } description "This data type is used to report when a value of an attribute is 'unknown', to differentiate from the case where the attribute is not applicable."; reference "RFC XXXX: Common YANG Data Types for Layer 0 Optical Networks, section 2.2.1"; } 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 (10/2020): Transverse compatible dense wavelength division multiplexing applications for repeatered optical fibre submarine cable systems"; } typedef snr-or-unknown { type union { type snr; type unknown-value; } description "(Optical) Signal to Noise Ratio measured over 0.1 nm resolution bandwidth, when known, or an empty value when unknown."; } typedef decimal-2 { type decimal64 { fraction-digits 2; } description "A decimal64 value with two fractional digits."; } typedef decimal-2-or-unknown { type union { type decimal-2; type unknown-value; } 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-unknown { type union { type power-gain; type unknown-value; } 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-unknown { type union { type power-loss; type unknown-value; } 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-unknown { type union { type power-ratio; type unknown-value; } 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-unknown { type union { type power-dbm; type unknown-value; } 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 fractional digits."; } typedef decimal-5-or-unknown { type union { type decimal-5; type unknown-value; } 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-unknown { type union { type psd; type unknown-value; } description "The 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 fractional eighteen digits."; } typedef decimal-18-or-unknown { type union { type decimal-18; type unknown-value; } description "A decimal64 value with eighteen digits, when the value is known or an empty value when the value is not known."; } /* * Groupings */ grouping l0-label-range-info { description "Common grouping used to define WSON, flexi-grid and WDM label ranges. When used to define a WSON label range, this grouping SHOULD be used together with the wson-label-start-end and wson-label-step groupings to provide WSON technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; leaf grid-type { type identityref { base l0-grid-type; } description "The type of WDM 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"; } 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)"; } } grouping wson-label-start-end { description "The WSON label-start or label-end used to specify WSON label range. This grouping is dependent on the range-type defined in the l0-label-range-info grouping. This grouping SHOULD be used together with the l0-label-range-info and wson-label-step groupings to provide WSON technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; choice grid-type { description "Label for DWDM or CWDM grid"; case dwdm { leaf dwdm-n { when 'derived-from-or-self(../../../grid-type, ' + '"l0-types: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, ' + '"l0-types: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"; } } } } grouping wson-label-step { description "Label step information for WSON. This grouping is dependent on the range-type defined in the l0-label-range-info grouping. This grouping SHOULD be used together with the l0-label-range-info and wson-label-start-end groupings to provide WSON technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; 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"; choice l0-grid-type { description "Grid type: DWDM, CWDM, etc."; case dwdm { leaf wson-dwdm-channel-spacing { when 'derived-from-or-self(../../grid-type, ' + '"l0-types: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, ' + '"l0-types: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"; } } } } grouping wson-label-hop { description "Generic label-hop information for WSON."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; 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."; reference "ITU-T G.694.1 (10/2020): Spectral grids for WDM applications: DWDM frequency grid"; } } 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"; } } } } grouping flexi-grid-label-range-info { description "Flexi-grid-specific label range related information. This grouping SHOULD be used together with the flexi-grid-label-start-end and flexi-grid-label-step groupings to provide flexi-grid technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; uses l0-label-range-info; container flexi-grid { description "flexi-grid definition"; leaf slot-width-granularity { type identityref { base flexi-slot-width-granularity; } default "l0-types:flexi-swg-12p5ghz"; description "Minimum space between slot widths."; reference "RFC 8363: GMPLS OSPF-TE Extensions in Support of Grid Dense Wavelength Division Multiplexing (DWDM) Networks"; } leaf min-slot-width-factor { type uint16 { range "1..max"; } 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-start-end { description "Common grouping used to define the value 'N' which is used to determine the nominal central frequency (e.g., as the flexi-grid label-start or label-end used to specify flexi-grid label range). When used to define a flexi-grid label range, this grouping SHOULD be used together with the flexi-grid-label-range-info and flexi-grid-label-step groupings to provide flexi-grid technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers"; 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."; } } grouping flexi-grid-label-step { description "Label step information for flexi-grid label ranges. This grouping SHOULD be used together with the flexi-grid-label-range-info and flexi-grid-label-start-end groupings to provide flexi-grid technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; leaf flexi-grid-channel-spacing { type identityref { base flexi-ch-spc-type; } default "l0-types:flexi-ch-spc-6p25ghz"; status obsolete; 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 "l0-types: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."; reference "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."; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers"; uses flexi-grid-label-start-end; leaf flexi-m { type flexi-m; description "The given value 'M' is used to determine the slot width."; } } grouping flexi-grid-label-hop { description "Generic label-hop information for flexi-grid."; reference "RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers"; choice single-or-super-channel { description "single or super channel"; case single { uses flexi-grid-frequency-slot; } case super { status obsolete; list subcarrier-flexi-n { key "flexi-n"; status obsolete; description "List of subcarrier channels for flexi-grid super channel."; uses flexi-grid-frequency-slot { status obsolete; } } } 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; description "List of frequency slots used for flexi-grid super channel."; uses flexi-grid-frequency-slot; } } } } } grouping wdm-label-range-info { description "Label range information for WDM. This grouping SHOULD be used together with the wdm-label-start-end and wdm-label-step groupings to provide WDM technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; container wdm-label-range { description "Label range information for WDM."; uses l0-label-range-info; container flexi-grid { when 'derived-from-or-self(../grid-type, ' + '"l0-types: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 "l0-types:flexi-swg-12p5ghz"; description "Minimum space between slot widths."; 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"; } 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 wdm-label-start-end { description "The WDM label-start or label-end used to specify DWDM and CWDM label ranges. This grouping is dependent on the range-type defined in the wdm-label-range-info grouping. This grouping SHOULD be used together with the wdm-label-range-info and wdm-label-step groupings to provide WDM technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers"; container wdm-label { description "Label start or label end for WDM. The format of the label depends on the type of WDM grid specified in the 'grid-type' leaf defined in the wdm-label-range-info grouping."; leaf dwdm-n { when 'derived-from-or-self(../../../../wdm-label-range' + '/grid-type, "l0-types:wson-grid-dwdm")' { description "Valid only when grid type is a fixed DWDM grid."; } type dwdm-n; description "The given value 'N' is used to determine the nominal central frequency on a DWDM fixed grid."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } leaf cwdm-n { when 'derived-from-or-self(../../../../wdm-label-range' + '/grid-type, "l0-types:wson-grid-cwdm")' { description "Valid only when grid type is a CWDM grid."; } type cwdm-n; description "The given value 'N' is used to determine the nominal central wavelength on a CWDM fixed grid."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } uses flexi-grid-label-start-end { when 'derived-from-or-self(../../../wdm-label-range' + '/grid-type, "l0-types:flexi-grid-dwdm")' { description "Valid only when grid type is a flexible DWDM grid."; } } } } grouping wdm-label-step { description "The WDM label-step used to specify DWDM and CWDM label ranges. This grouping is dependent on the range-type defined in the wdm-label-range-info grouping. This grouping SHOULD be used together with the wdm-label-range-info and wdm-label-start-end groupings to provide WDM technology-specific label information to the models which use the label-restriction-info grouping defined in the module ietf-te-types."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers 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"; container wdm-label-step { description "Label step for WDM. The format of the label depends on the type of WDM grid specified in the 'grid-type' leaf defined in the wdm-label-range-info grouping."; leaf wson-dwdm-channel-spacing { when 'derived-from-or-self(../../../wdm-label-range' + '/grid-type, "l0-types:wson-grid-dwdm")' { description "Valid only when grid type is a fixed DWDM grid."; } type identityref { base dwdm-ch-spc-type; } description "The channel spacing (GHz) of a fixed DWDM grid, e.g., 100 GHz, 50 GHz, 25 GHz, or 12.5 GHz."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } leaf wson-cwdm-channel-spacing { when 'derived-from-or-self(../../../wdm-label-range' + '/grid-type, "l0-types:wson-grid-cwdm")' { description "Valid only when grid type is a CWDM grid."; } type identityref { base cwdm-ch-spc-type; } description "The channel spacing (nm) of a fixed CWDM grid, e.g., 20nm (which is the only standardized value)."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } container flexi-grid-cfg { when 'derived-from-or-self(../../../wdm-label-range' + '/grid-type, "l0-types:flexi-grid-dwdm")' { description "Valid only when grid type is a flexible DWDM grid."; } description "The Central Frequency Granularity (CFG) of a flexible DWDM grid (flexi-grid), defined as a multiplier of the Nominal central frequency granularity (NCFG)."; uses flexi-grid-label-step; } } } grouping wdm-label-hop { description "Generic label-hop information for DWDM and CWDM labels."; container wdm-label { description "Label hop for WDM."; choice grid-type { description "Label for DWDM or CWDM grid."; reference "RFC 6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; case fixed-dwdm { choice fixed-single-or-multi-channel { description "Single channel or multichannel."; 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; } } } } 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 on where this grouping is actually used."; reference "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology."; 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"; min-elements 1; description "The list of supported transceiver's modes."; leaf mode-id { type string { length "1..255"; } description "An identifier for the supported transceiver's mode."; } choice mode { mandatory true; description "Indicates whether the transceiver's mode is a standard mode, an organizational mode or an explicit mode."; case g.698.2 { container g.698.2 { description "The set of attributes for a standard mode defined in ITU-T G.698.2."; reference "ITU-T G.698.2 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network"; uses standard-mode { refine "standard-mode" { mandatory true; } } uses common-standard-organizational-mode; uses common-all-modes; } } case organizational-mode { container organizational-mode { description "The set of attributes for an organizational mode."; uses organizational-mode { refine "operational-mode" { mandatory true; } refine "organization-identifier" { mandatory true; } } uses common-standard-organizational-mode; uses common-all-modes; } } case explicit-mode { container explicit-mode { 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()]/' + 'g.698.2' { 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."; } } } } } } } } grouping standard-mode { description "Identifies an ITU-T G.698.2 standard application code."; reference "ITU-T G.698.2 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network, Clause 5.3"; leaf standard-mode { type standard-mode; 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 clause 5.3 of ITU-T G.698.2."; } } grouping organizational-mode { description "Transponder operational mode supported by organizations or vendor"; reference "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.6.2"; leaf operational-mode { type operational-mode; description "configured organization- or vendor-specific application identifiers (AI) supported by the transponder"; } leaf organization-identifier { type organization-identifier; description "The identifier of the organization that defines the organizational-mode."; } } grouping penalty-value { description "A common definition of the Optical Signal-to-Noise Ratio (OSNR) penalty value used for describing multiple penalty types (e.g., CD, PMD, or PDL)."; leaf penalty-value { type union { type decimal-2 { range "0..max"; } type unknown-value; } units "dB"; 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 "The attributes describing capabilities of an 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 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network, Clause 7.1.2"; } leaf bitrate { type uint16; units "Gbit/sec"; config false; description "The gross bitrate (e.g., 100 or 200) of the optical tributary signal."; } leaf max-diff-group-delay { type decimal-2; units "ps"; config false; description "The maximum Differential Group Delay (DGD) the receiver can tolerate."; } 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 "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.6.4"; } 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)."; reference "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.6.4"; leaf cd-value { type decimal-2; units "ps/nm"; description "The Chromatic Dispersion (CD)."; } uses penalty-value; } 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 RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.4.6"; } 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)."; reference "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.4.6"; leaf pmd-value { type decimal-2 { range "0..max"; } units "ps"; description "The Polarization Mode Dispersion (PMD)."; } uses penalty-value; } leaf max-polarization-dependent-loss { type power-loss-or-unknown; 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 "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.4.6"; } 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)."; reference "RFC ZZZZ: A YANG Data Model for Optical Impairment-aware Topology, Section 2.4.6"; leaf pdl-value { type power-loss; description "Maximum acceptable accumulated polarization dependent loss (PDL)."; } uses penalty-value; } 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 "Minimum 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"; description "The Received Power."; } uses penalty-value; } leaf min-q-factor { type decimal-2; units "dB"; config false; description "The value of the Q factor at the FEC threshold (fec-threshold)."; reference "ITU-T O.201 (07/2003): Q-factor test equipment to estimate the transmission performance of optical channels"; } 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 common-standard-organizational-mode { description "The attributes describing the capabilities for a standard or an organizational transceiver's mode."; 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 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network, Clause 7.1.2"; } } 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 common-all-modes { description "The attributes describing the capabilities for any type of transceiver's mode."; 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 multichannel 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 v3.0 (11/2018): Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces Optical transport network, Clause 7.1.2"; } leaf tx-channel-power { type power-dbm-or-unknown; description "The current channel transmit power. The 'unknown' value MUST NOT be used when this attribute is configured."; } } 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-unknown; config false; description "The current channel received power."; } leaf rx-total-power { type power-dbm-or-unknown; config false; description "The current total received power."; } } 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 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."; } } } ]]>