Vivotek VAST User Manual page 62

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You can add VAST or free standard ST7501 as the sub-stations. The number of sub-stations can be

added to the server depends on your key dongle. The VAST server will automatically detect the USB
dongle installed on your host PC. Following is an illustration for two-level hierarchical architecture:
Please note that the following cyclic relay is not allowed.

54 - User's Manual
Server A
Add server B
as substation
Server B
Server C
Add server C
as substation