4RF Aprisa SR+ User Manual - page 25
About the Radio | 23
Aprisa SR+ User Manual 1.5.3
Peer To Peer Communication Between Remote Radios
The Aprisa SR+ peer to peer communication between remote radios is used to enable communication
between remote radios via the repeater or base-repeater. It is useful if the SCADA server or base station
fails or when in some industries like the water industry, where a reservoir remote station might send a
direct message to a valve remote station to close or open the valve without the intervention of the SCADA
server.
The Aprisa SR+ has a special operating mode for peer to peer communication between remote radios and
requires the following settings:
1. If peer to peer communication between remote radios is required to operate via the base station,
then the SuperVisor > Terminal > Operating Mode > Terminal operating mode must be set to ‘Base-
Repeater’. Base-Repeater operating mode doesn’t change the Network Radius parameter as the
base-repeater is considered to be like a regular base station.
2. The remote radios participating in peer to peer communication must set the SuperVisor > Radio >
Channel Setup > Packet Filtering to Disable to allow a repeated packet received from peer to peer
remote radios by the repeater or base-repeater to forward the packet to the relevant interface
and not to discard it.
3. IP Header Compression must be disabled on all radios (base, repeater, remotes) for this feature to
operate correctly (See ‘IP Header Compression Ratio’ on page 115).
4. Note: In ‘Router Mode’ setup a static route for any required peer to peer path.
The following example depicts peer to peer communication between remote radios via a base-repeater
and via a repeater station where remote-1 and remote-2 communicate with each other via the base-
repeater station and remote-3 and remote-4 communicate with each other via the repeater station. All
the remote radios are configured with packet filtering disabled and all radios in the network are
configured with IP header compression ratio disabled.
Note: The Aprisa SR+ network is transparent to the protocol being transmitted; therefore the Packet
Filtering parameter is based on the Aprisa SR+ addressing and network protocols, not the user (SCADA,
etc.) traffic protocols.