KAD/MBM/101 1 channel Dual Redundant Bus Monitor

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The KAD/MBM/101 is a MIL-STD-1553 dual redundant bus monitor which combines the capabilities of a coherent message parser, with the flexibility of an iNet-X packetizer. It also provides message counting and extensive error detection functions on a single module. The KAD/MBM/101's parser triple buffers up to 1,024 messages (including one catchall), and their associated tags, in buffers up to 43 words wide. The Info tag associated with each message has a stale bit (message read before), a skipped bit (buffer overwritten), and an empty bit (no message received since power-up)—all of which can be included as discrete parameters for transmission or logging.

Moreover, all MIL-STD-1553 messages are encapsulated as iNET-X parser-aligned payload structures. These parser-aligned packets may be transmitted aperiodically to optimize network bandwidth utilization and memory usage when recording the MIL-STD-1553 bus. Aperiodic packet transmission ensures that no messages are lost since the KAM-500 controller oversamples the KAD/MBM/101 and generates only a packet for transmission when the buffer is not empty, that is when at least one new message has been captured from the bus. Two message counters increment on receipt of a valid message. The REPORT word has a fresh error flag with a 6-bit error code to indicate the type of error caught and the bus on which it occurred. Errors are also time-stamped and recorded in the iNET-X packet.


  • Monitors one dual redundant MIL-STD-1553 bus using Direct or Transformer coupled operation
  • Coherently parses traffic and tags for up to 1,024 parser ID; parser ID based on 16-bit commands; RT-RT messages treated as one parser ID
  • Aperiodic transmission of packetized MIL-STD-1553 messages including tags as iNET-X payload structure per channel
  • Optional recording of messages with time-out status reply


  • MIL-STD-1553 traffic monitoring and recording
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KAD/MBM/101 1 channel Dual Redundant Bus Monitor

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