Telemetry is low speed data that is control information. As of the low data rate narrow bandwidth frequency channels are only needed.
To interconnect radios for complete redundancy and extend coverage a Mesh radio network has multiple connections. The MX1 System which is designed to remotely operate safety traffic lights is an in-house solution that uses Mesh radio and low bit rate data telemetry for Marshals to control the track safety track lights.
Mesh radio traffic light track safety solution