Planet Technology FT-1205A - Manual (Page 17)

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Chapter 7 Redundancy
The FT-1105A / FT-1205A provide less than 10ms link
redundancy for highly critical Ethernet applications. The
redundant-mode supports auto-recover function. If the
destination port of a packet is link down, it forwards the packet
to the other port of the backup pair. The following figure shows
the redundant function.
Main Primary
Backup
Redundancy
< Primary Port >
Link Status : Up
Traffic Flow : Forwarding
< Backup Port >
Link Status : Up
Traffic Flow : Blocking
Main Primary
Backup
Redundancy
< Primary Port >
Link Status : Down
Traffic Flow : N/A
< Backup Port >
Link Status : Up
Traffic Flow : Forwarding
Traffic is changed from Primary-Port to Backup-Port
● Link status auto detect and redundant on Dual ports with
same connector type.
● Only Primary-Port is active at a time, the Backup-Port is
blocked.
● While Primary-Port link fail occur, the traffic swap to Backup-
Port automatically.
● Once the Primary-Port status back to link up, the traffic swap
from Backup-Port to Primary-Port.