The base radios can be either what Motorola calls RT (repeater) or RA (remote access) base stations. In a typical configuration they each would be local in-cabinet repeaters and the AM360 link would simply key up the remote base at the same time that the local repeater is activated. This way the coverage of each base radio can be combined into a greater coverage area over an inexpensive link.

In mountainous regions this can be used to achieve simulcast coverage over the ridge by linking 2 or more base stations via RoIP. For multiple base stations use IP multicast so that all the IP gateways are on the same voice "channel"; when one keys up, they all key up simultaneously as if they were all wired together locally as RA stations. This is a good method to build a radio system that covers a wide area.

The base stations in the diagram above could instead be control stations that operate through mountaintop repeaters. In many cases there is no Internet or phone line access to these remote repeater sites, whereas the control station likely has all the facilities necessary for public Internet service or a private data network connection.