Packet Filtering
Each Aprisa SR+ radio can filter packets not destined for itself. The Packet Filtering parameter controls this
functionality.
Normally all packets sent by remotes and repeaters are only received at the base station. Setting packet
filtering to disabled can provide the ability for remote radios to communicate with each other (peer to peer
communication) when connected to a repeater station, particularly useful in the event of losing
communication with a SCADA Master, assuming the Aprisa SR+ network is still operational.
In a network without repeaters, this setting only affects packets from base to remote (causing IP packets
for devices at one remote to be sent out ethernet ports of all remotes with packet filtering disabled).
When repeaters exist in the network, setting this to disabled on both the repeater and its immediately
connected remotes allows devices connected to those remotes to communicate with each other and with
the repeater.
With base-repeater mode, this setting is not usually required as the base station changes the destination
from itself to broadcast when it retransmits a packet. However, if base-repeater is used in conjunction with
repeaters, then it can still be useful to disable packet filtering to reduce message latency between distant
remotes.
Note: For correct PTP link operation, the Packet Filtering parameter should not be changed from the default
setting of 'automatic'.
Note: Packet filtering will remain enabled for IP packets regardless of this setting unless IP Header
Compression is disabled (see āIP Header Compression Ratioā on page 147).
The default setting is Automatic.
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.
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