The Séance box communicates with the PCs over a 10Base-2 Ethernet connection via a 50 ohm BNC cable terminated at each end with a 50 ohm terminator. The Séance box has two BNC connectors for each PC interface, which are wired in parallel inside.A 50 ohm terminator plugs into the BNC socket labeled TERMINATOR and the Ethernet cable plugs into the BNC socket labeled COMPUTER. A terminator and T-piece are used to connect the Ethernet cable to the PC.The Seance box can also communicate with the PC via an RJ45 connector depending on the type of Ethernet-card in the computer. The Séance box has two RJ45 connectors, one for each PC interface. These connectors should be connected directly into a computer. It is also possible to connect the RJ45 sockets to a hub. For details about this, contact CADAC technical support. We've never done it. Used extensively with a J-Type console, I don't know its compatibility with other Cadac desks.