Connection Rate Limit Mode

Hi there, for Connection Rate Limit Mode I can select "Per Source Address(All Rate Limiting Virtual Servers)". According to doc this mode "Applies rate limiting based on the specified source address for all virtual servers that have rate limits specified." Can someone explain in more detail? Does this mode imply that the rate limit is based on source address only for all virtual servers configured with this mode? And if so, which virtual server Connection Rate Limit would then be used? Thanks!