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YD/T 1634-2025Optical Transport Network physical layer interfaces (English PDF)

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Issued by

Ministry of Industry and Information Technology

Level / Type

National · Recommended

Issue date

July 2, 2025

Implementation date

November 1, 2025

Scope

YD/T 1634-2025 (Optical Transport Network physical layer interfaces) is available as an English-translated PDF.

YD/T 1634-2025 — This standard specifies the technical requirements for inter-domain physical layer interfaces (IrDI) in optical networks that can utilize wavelength division multiplexing (WDM) technology.

It mainly includes the classification of physical layer interfaces for optical transport networks (OTN), interface compatibility, definitions of optical interface parameters, optical interface parameter values, and optical security considerations.

This standard applies to IrDIs for OTN conforming to ITU-T G.709, and also to IrDIs for non-OTN systems incompatible with OTN as defined in ITU-T G.871.

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Document preview — YD/T 1634-2025

National Standard of the People's Republic of China

ICS: 33.040.20
Classification: M 30
Replacing: YD/T 1634-2016

Issued by: Ministry of Industry and Information Technology

What this standard covers1
Document data2

What this standard covers

This standard specifies the technical requirements for inter-domain physical layer interfaces (IrDI) in optical networks that can utilize wavelength division multiplexing (WDM) technology. It mainly includes the classification of physical layer interfaces for optical transport networks (OTN), interface compatibility, definitions of optical interface parameters, optical interface parameter values, and optical security considerations. This standard applies to IrDIs for OTN conforming to ITU-T G.709, and also to IrDIs for non-OTN systems incompatible with OTN as defined in ITU-T G.871. This standard applies to intra-office, short-distance, and long-distance systems without line optical amplifiers.

Document data

International classification (ICS): 33.040.20.

Chinese classification (CCS): M30.

Supersedes the earlier edition YD/T 1634-2016.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

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