sentences:  Such a system is for example DVB-S.However, ULE can also be used in the context of DVB-C and DVB-T, theoretically in every system which is based on MPEG transport streams (e.g., ATSC).ULE has been engineered by the IP over DVB (ipdvb) working group of the Internet Engineering Task Force (IETF) and has been standardized in RFC 4326.