Afar AR24027, Operator'S Manual

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AR24027 Operator’s Manual
2-6
Make sure that all radios have the tdd sync-mode set to auto . If you follow the above guidelines the
radios will spread the synchronization across the network and completely avoid self-interference. At
any device use the
“>show ” command to find which radio is the source for the heartbeat at that site.
A
B
B
B
B A B A
LAN
A
B
B
A B
B
A
A
A
Tx Rx Tx Rx Tx
Rx Tx Rx Tx Rx
Time
(A)
(B)
Figure 2.2– Mutliple Topology Network
2.3.4 Heartbeat packet suppression
There are situations when the multicast of heartbeat packets may not be necessary, and would put an
unnecessary burden on the Ethernet. The radios detect these situations automatically and suppress the
multicast of the heartbeat packets when there is no co-located device to receive them.
You may need to co-locate radios and do not wish them to try and synchronize to each other. For
example, if the connection between LAN ports of the radios goes through bridges that insert variable
delays on the Ethernet packets, the synchronization protocol may not work properly. In these cases
you can turn off the radio participating in the synchronization protocol by setting the
tdd sync-mode
to off . This is also the appropriate setting if multiple co-located radios get synchronization over RF
and therefore cannot accept a heartbeat over the ethernet.. In these cases you need to avoid self-
interference with the more traditional methods of increasing the separation between antennas, and/or
reducing transmit power