About the Radio | 33
Aprisa SRi User Manual 1.1.0
Network Layer
Packet Routing
Aprisa SRi is a standard static IP router which routes and forwards IP packet based on standard IP address
and routing table decisions.
Aprisa SRi router mode (see figure below), enables the routing of IP packets within the Aprisa SRi wireless
network and in and out to the external router / IP RTUs devices connected to the Aprisa SRi wired Ethernet
ports.
Within the Aprisa SRi Router mode, each incoming Ethernet packet on the Ethernet port is stripped from its
Ethernet header to reveal the IP packet and to route the IP packet based on its routing table. If the
destination IP address is one of the RTUs, the packet is then forwarded to the wireless ports and broadcasted
as a PMP wireless packet to all the remote radios. The appropriate remote then routes the IP packet and
forwards it based on its routing table to the appropriate Ethernet port, encapsulating the appropriate next
hop MAC header and forwarding it to the RTU. The RTU can then interpret and process the IP data and
communication is established between the RTU and the initiating communication device.