Description: The 9525A is a fiber optic data modem for use in daisy chain and redundant ring drop/insert data communications systems. It is optically compatible with other OptelecomNKF fiber data modems, including a number of the 41XX series, the 9522A, and 9526A drop/insert modems. It is user-programmable for Master or Slave operation via dipswitch or by external contact closures and has automatic ring break detection and a selectable echo cancel feature that prevents a master unit from receiving its own transmissions. Dual function LED indicators for I/O signals and a built-in BERT tester simplify system troubleshooting. Features Model 9525A ?Çó Transports duplex data in drop/insert data communications systems ?Çó User-programmable RS232, RS422, or RS485 operation ?Çó RS232 Expansion Port ?Çó Daisy chain or fault tolerant redundant ring architecture ?Çó Data retiming permits virtually unlimited repeating ?Çó Optical and electrical anti-streaming circuitry for network protection ?Çó Operates at baud rates to 115.2 Kbps ?Çó Built-in 6V Gel cell charger and connector for external battery backup ?Çó Standalone module
