MIL-STD-1553 is a military standard defining a serial data bus used primarily in avionics and space applications. It features dual redundant channels (A and B) for high reliability and fault tolerance. The standard supports up to 31 remote terminals, with the 32nd typically reserved for broadcast messages. It operates at a data rate of 1 MHz, using Manchester II bi-phase encoding and a command/response protocol. The bus is half-duplex, meaning data can flow in both directions but not simultaneously. The specification includes options for operating temperatures ranging from 0 to +70 degrees Celsius and -25 to +80 degrees Celsius, with conformal coating available for environmental protection. The module includes 128 Kbyte SRAM and supports BC/RT/MT modes. It has separate logic for the PCI interface and supports both 3.3V and 5.0V I/O. The module uses 78 ohm transformers and supports long and short stub configurations. It is designed for low power consumption and includes LED status indicators. Available software includes C libraries, Windows, Linux, and VxWorks drivers. The module operates with a 33 MHz PMI clock and is PICMG compliant.