Common mode transient immunity for an isolation system is improved by using a common transient suppression circuit coupled to a receive circuit to suppress transients in signals received by the receive circuit that were transmitted from a transmit side of the isolation barrier using optical, magnetic, inductive, or other mechanisms. According to the invention, the electronic circuit is arranged inside a housing, the housing has a first contact surface and a second contact surface, and the first contact surface is joined to the second contact surface of the other module in a manner that permits it to be mechanically detached. Rather than require an administered list, the system discovers which clients are active, places the active clients on an active list, and excludes all client not on the active list. The computing system generates a treatment plan to deliver treatment to the partial-ITV. The catalyst particles include an oxide catalyst having an average particle diameter of at least about 0. The gain of each transmitter unit and the gain of each receiver unit are determined based on the first and second overall gains.