"Stack / CEMS / DAHS Control Structure"
Number of CEMS shelters controlled by each DAHS server. (The total number of CEMS shelters) = (number of DAHS servers) * (number of CEMS per DAHS server).
For a big site, you can have multiple DAHS servers to monitor CEMS equipment. To simplify DAHS configuration, a DAHS server should handle less than 10 CEMS shelters.