http://www.rfc-editor.org/rfc/rfc1185.txt
RFC 1185: TCP Extension for High-Speed Paths, V. Jacobson, R.T. Braden, L. Zhang1990-10-01T23:00:00-00:00This memo describes an Experimental Protocol extension to TCP for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol.