1. IEEE802.3: http://www.ieee802.org/3/index.html
2. OIF: Optical Internetworking Forum: http://www.oiforum.com/
3. QSFP-DD: http://www.qsfp-dd.com/
4. OSFP: http://osfpmsa.org/index.html
5. OSFP-XD: https://www.lightwaveonline.com/optical-tech/transmission/article/14205029/new-osfpxd-form-factor-could-challenge-copackaged-optics