In an ATM switching system, an ABR service is implemented with a specific ABR control capability. A subscriber line processing device includes calculating a turnaround delay time of a cell, based on a period during which the cell doubles back at a terminal. A switch or a demultiplexer capable of detecting...http://www.google.de/patents/US6671257?utm_source=gb-gplus-sharePatent US6671257 - Feedback control method and device in ATM switching system
