What telemetry options are available?
The choice of telemetry options is primarily dependent on the distance between stations and the physical topology of the system to be monitored. Typically, the answer to this question must be separated based on the type of control system, remote telemetry, such as a water distribution and storage or wastewater collection and transportation (remote telemetry) or a treatment plant with short distances and manageable communications paths. Remote Telemetry As with computer technology, telemetry options have expanded in recent years. Originally, the primary information transport mechanism was tone based telemetry over analog circuits leased from the local phone utility. As technology changed, tone was replaced by digital modems and the rate increased from 30 characters per seconds up to 1920 characters per second (and in some cases even 5600 characters per second. In all these cases, the weak link was the need for land based lines owned and supported by the local phone company. Radio based
