X40 is an industry collaborative to create a Multi Source Agreement (MSA) for hot-pluggable 40 Gb/s optical transceivers. The goal of the X40 MSA is to lower cost, extend reach and increase port density for telecom and datacom systems with 40 Gb/s interfaces.
Read the press release:Industry Leaders Unveil "X40" Collaboration to Reduce 40 Gb/s Costs with Hot-Pluggable Multi-Rate 40 Gb/s Optical Transceiver
MSA Documents:
Presentation - 40 Gb/s Multi-Rate Pluggable Optical Transceivers
Whitepaper - X40 - A Collaboration for Economical 40 Gb/s Pluggable Transceivers