(LCAS) allows for dynamically changing the bandwidth via dynamic virtual concatenation, multiplexing containers based on the short-term bandwidth needs in the network. The set of next-generation SONET/SDH protocols that enable Ethernet transport is referred to as Ethernet over SONET/SDH (EoS). End of life and retirement SONET/SDH was used by internet access providers for large customers, and is no longer competitive in the supply of private circuits. Development has stagnated for the last decade (2020) and both suppliers of equipment and operators of SONET/SDH networks are migrating to other technologies such as OTN and wide area Ethernet. British Telecom has recently (March 2020) closed down their KiloStream and Mega Stream products which were the last large scale uses of the BT SDH. BT has also ceased new connections to their SDH network which indicates withdrawal of services soon. See also List of device bandwidths Routing and wavelength assignment Multiwavelength optical networking Optical mesh network Optical Transport Network Remote error indication G.709 Transmux Internet access Notes References External links Understanding SONET/SDH The Queen's University of Belfast SDH/SONET Primer SDH Pocket Handbook from Acterna/JDSU SONET Pocket Handbook from Acterna/JDSU The Sonet Homepage SONET Interoperability Form (SIF) Network Connection Speeds Reference Next-generation SDH: the future looks bright The Future of SONET/SDH (pdf) Telcordia GR-253-CORE, SONET Transport Systems: Common Generic Criteria Telcordia GR-499-CORE, Transport Systems Generic Requirements (TSGR): Common Requirements ANSI T1.105: SONET - Basic Description including Multiplex Structure, Rates and Formats ANSI T1.119/ATIS PP 0900119.01.2006: SONET - Operations, Administration, Maintenance, and Provisioning (OAM&P) - Communications ITU-T recommendation G.707: Network Node Interface for the Synchronous Digital Hierarchy (SDH) ITU-T recommendation G.783: Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks ITU-T recommendation G.803: Architecture of Transport Networks Based on the Synchronous Digital Hierarchy (SDH) ITU-T G Series Recommendations Fiber-optic communications Network protocols ITU-T recommendations