BISDN in the subscriber loop using a passive optical network

For the short term economic provision of broadband ISDN (BISDN) services in the subscriber loop Siemens presents a demonstrator based on a passive optical network (PON). It will provide 32 subscribers with BISDN access. Asynchronous transfer mode (ATM) cells preceded by a system overhead are transferred at a rate of 155.52 Mb/s in both directions. For the transmission of the ATM-cells flexible time division multiplexing/time division multiple access (TDM/TDMA) protocol is applied. By using a minimum number of analog components in the electronic circuitry system cost and fault liability is likely to be significantly reduced. An operation, administration, and maintenance (OAM) concept is presented considering the CCITT recommendations for BISDN point to point connections. The bit error ratio and failure conditions are monitored separately for each subscriber.