The CWDM4 MSA targets a common specification for low cost 100G optical interfaces that run up to 2 km in data center applications. The MSA uses CWDM (Coarse Wavelength Division Multiplexing) technology with 4 lanes of 25 Gb/s optically multiplexed onto and demultiplexed from duplex single mode (SMF) fiber.

Frequently Asked Questions (FAQ)

100G CWDM4 MSA Technical Specifications Revision 1.1 (pdf)

100G CWDM4 MSA Technical Specifications Revision 1.0 (pdf)

MSA Objectives and Specification Status (pdf) (presented at Ethernet Alliance 40G/100G Meeting, April 2014)

100G CWDM4 MSA Comment Resolution Responses Ver. 11 (xlsx)

Recommendation ITU-T G.695 CWDM Optical Interfaces (pdf) (Table 8-23, pages 49-50, 25G OTL4.4 Applications)

Founding Members

Press Releases


All Members >>
New Member Interest Application (pdf)

September 9, 2014 – CWDM4 MSA Releases Detailed Specification for Low Cost 100G Optical Interfaces Targeting Data Center Applications (pdf)

March 31, 2014 – CWDM4 MSA Group to Support Deployment of 2km 100G Links in Data Centers (pdf)