Cadac CDC five_02-01-2020_Rev-7.docx
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Connecting the Hardware
MegaCOMMS
Cadac’s proprietary MegaCOMMS hi-speed data protocol is used to interconnect the CDC five’s control
surface and stage rack(s). The control surface has four BNC sockets to provide the main system data
interconnection, labelled IN (RX) A, OUT (TX) A and IN (RX) B, OUT (TX) B.
14: CDC five - 2 pairs of MegaCOMMS ports
The current stage boxes - CDC I/O 3216 and CDC I/O 6448 - have either two (1 pair) or four (2 pairs)
BNC sockets.
The two paths A and B carry identical and synchronous data, and can be used in various ways,
depending whether system redundancy is required. Providing a redundant path gives greater system
robustness, as the CDC five will automatically switch its comms to Path B if communication is lost on
15: CDC I/O 3216 - 1 pair
of MegaCOMMS ports
16: CDC I/O 6448 - 2
pairs of MegaCOMMS
ports