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E Series Ethernet Radio – User Manual
Version 08-10
Part C – Applications
In a multiple access radio system (MAS),user data is broadcast from one common site (the Access Point) to all others, either using a half duplex or
simplex radio channel.
To facilitate efficient data communication and support features such as collision avoidance, the Access Point should always be a full duplex radio.
For serial data, the SCADA host must support an addressing system such as a DNP or MODBUS device address, since the Access Point broadcasts
this data to all remotes. Ethernet data is transported transparently and end devices will identify information for themselves using the Ethernet/IP header
information.
This type of system topology is the most efficient PTMP topology and should always be implemented if possible.
Point-to-Multipoint Networks (PTMP)
A Point to Multipoint (PTMP) network is normally chosen when one site (i.e.: The HOST) needs to broadcast messages to multiple REMOTE sites.
Point to Multipoint (PTMP) operation requires the Access Point site to have adequate RF coverage of all Remote sites. A PTMP offers the best
available bandwidth and data latency when multiple remote sites are required.
