http://www.rfc-editor.org/rfc/rfc5163.txt
RFC 5163: Extension Formats for Unidirectional Lightweight Encapsulation (ULE) and the Generic Stream Encapsulation (GSE), G. Fairhurst, B. Collini-Nocker2008-04-01T23:00:00-00:00The Extension Header formats specified in this document define extensions appropriate to both ULE and the Generic Stream Encapsulation (GSE) for the second-generation framing structure defined by the Digital Video Broadcasting (DVB) family of specifications. [STANDARDS-TRACK]