When round-robin load balancing is selected, NetCloud Manager distributes each request from a client device across the available modems in the endpoint.
When an IP connection (session) is made from a client device attached to the endpoint, each available modem is enumerated. For example, in a dual modem endpoint, imagine there is a modem A and a modem B. No emphasis is placed on the bandwidth available to either modem; instead, the connection is placed on modem A. The next connection is placed in modem B, again, regardless of bandwidth. All connections afterward alternate between the two available modems.
Importantly, the algorithm assumes that each modem is similar (or identical) in capability and bandwidth. This would be a drawback if, for example, Modem A was a 3G modem while modem B was a 4G or even 5G modem. So it is important to only use this algorithm when the two modems in the endpoint are equivalent in their capabilities.