Specifications

Rockwell Automation Publication AG-SG001G-EN-P - April 2015 23
Choosing a Telemetry Network Chapter 2
Point-to-multipoint connections are generally four-wire connections, with the
transmission media using four wires for signal transmission/reception: one pair
to transmit and one pair to receive. Private leased lines and digital data services
provide four-wire, point-to-multipoint connections.
Multipoint-to-multipoint
Multipoint-to-multipoint is a radio modem communication link among three or
more stations where there is no communication arbitrator (master) and any
station can initiate communication with any other station.
This is the topology used by spread-spectrum Ethernet radio modems. It provides
a peer-to-peer network among stations.
TIP
Point-to-multipoint is the main topology for SCADA
applications.
Station Station
Radio Modem Radio
Modem
Station Station
Radio Modem Radio
Modem