Remote RMX-3200 Version 5.2x Configuration Guide
Drop and Continue Functionality: Failover
27-5
Failover
Remote RMX-3200 with DAC capability has safeguards against both power failure
and software failure. A drawback to using long chains of devices connected by a
single path is that the failure of one device in the chain can disrupt communication
with every other device beyond it. This type of failure can affect both dual-WAN and
DAC devices, but there is a simple failover solution for DAC.
When a failure occurs, relays built into Remote RMX-3200 T1/E1 ports snap closed,
which connects both cables together and allows data in all timeslots and in the T1
facilities data link (FDL) to pass in both directions. This enables other devices in the
chain to communicate as if Remote RMX-3200 were not there.
After the failure is corrected, Remote RMX-3200 prepares itself to manage both links
and switches itself back into the data path. There is no down time while Remote RMX-
3200 boots because it keeps itself out of the data path. The length of the interruption
when Remote RMX-3200 cuts back in is the same as the amount of time it takes the
relays to switch.
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