ITU-T G.698.4 (06/2023)

Table of Contents
1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Classification of optical interfaces
6.1 Applications
6.2 Reference points
6.3 Nomenclature
7 Transverse compatibility
8 Parameter definitions
8.1 General information
8.2 Interface at point SS or MPI-SM
8.3 Optical path from point MPI-SM to RS or SS to MPI-RM
8.4 Interface at point RS or MPI-RM
9 Parameter values
10 Optical safety considerations
11 Method of operation for 10 Gbit/s applications which do not have the ability to tune to the required TEE central frequency on its own
11.1 Optical frequency setting during tuning
11.2 Output power setting during tuning
12 Method of operation for 25 Gbit/s applications which have the ability to tune to the required TEE central frequency on its own
12.1 Introduction
12.2 State machine for a TEE which has the ability to tune to the required central frequency on its own
Appendix I – Output power setting during tuning

Recommendation ITU-T G.698.4 provides optical parameter values for physical layer interfaces of dense wavelength division multiplexing (DWDM) systems primarily intended for metro applications, where the tail-end transmitters have the capability to automatically adapt their DWDM channel frequency to the optical demultiplexer/optical multiplexer (OD/OM) or optical add-drop multiplexer (OADM) port.

The purpose of this Recommendation is to provide optical interface specifications for the realization of transversely compatible bidirectional dense wavelength division multiplexing (DWDM) systems, primarily intended for metro applications.