TNETS3001

The TNETS3001, synchronous optical network (SONET) overhead terminator, performs section overhead, line overhead, and path overhead signal processing at the STS-1 (51.84 Mbit/s) data rate. Repeaters, linetermination points, and path termination points are just a few applications that use the versatile TNETS3001.

The TNETS3001 contains three status registers, seven control registers, transport overhead RAM, and path overhead RAM; a line-side interface, terminal-side interface, orderwire/APS interface, datacom interface, and  microprocessor interface are also integrated into a single 84-pin plastic chip carrier, which is suitable for socket or surface mounting. Status and control registers configure the device and allow for different line-side and terminal-side clock rates (receive/transmit pointer is recalculated as necessary to compensate for the clock differences); the registers also enable the overhead terminator to perform loopback and serial/parallel inputs  or outputs. All transport and path overhead bytes are stored in the device RAM. Depending on the application, new overhead bytes are substituted from RAM to either terminal or line side. Besides software and hardware interrupts, alarm detection and alarm-indication signal (AIS) generation are provided. The device is controlled via a 9-bit address bus and an 8-bit interleaved data bus.