CM-SR644024_09-11-2023_Rev-25
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Connecting the Hardware
MegaCOMMS
Cadac
’s proprietary MegaCOMMS hi-speed data protocol is used to interconnect the stage racks to the
console. The stage racks and the control surface have four BNC sockets to provide the main system
data interconnection, labelled IN (RX) A, OUT (TX) A and IN (RX) B, OUT (TX) B. The interconnections
are also available on optical via two duplex optical LC ports next to the BNC sockets:
19: Stage Racks - CM-SR64, CM-SR40 and CM-SR24
– have 2 pairs of MegaCOMMS ports on BNC connectors
and 2 duplex optical LC ports
Cadac consoles also have four BNC sockets and two optical ports:
The two paths, A and B, carry identical and synchronous data, and can be used in various ways,
depending on whether system redundancy is required. Providing a redundant path gives greater system
robustness, as the MegaCOMMS unit will automatically switch its comms to Path B if communication is
lost on Path A, as might occur if a cable is damaged. Note that the Cadac CM-J series system is fully
functional in all respects if only one coax TX / RX or optical path is connected.
To use the duplex optical LC ports, it will require the purchase of compatible 1000BASE-LX/LH SFP
1310nm 10km DOM Duplex LC MMF/SMF transceiver modules from a third party, or for very short
distances Direct Attach Copper Cables.
20: Cadac consoles have 2 pairs of MegaCOMMS ports on BNC connectors and 2
duplex optical LC ports