Access Edge Servers can be set up in a consolidated topology or an expanded topology. The real difference between the two is that the services of Access Edge Servers, Web components, and audio/visual (A/V) components all exist on one server that shares all these roles. In an expanded topology, there are three potential configurations:
Single-Site Edge Server
Access Edge Server and Web Conferencing Server roles are on one server.
The Audio/Video Conferencing Server role is on another, separate server.
Scaled Single-Site Edge Server
Two or more collocated and load-balanced Access Edge Servers and Web Conferencing Servers are placed.
Two or more load-balanced Audio/Video Conferencing Servers are placed. ...