User`s manual

PT-7728 User’s Manual Featured Functions
3-24
Ring Coupling Configuration
For some systems, it may not be convenient to connect all devices in the system in a single
redundant ring, since some devices could be located in a remote area. For these systems, Ring
Coupling can be used to group devices into smaller redundant rings that communicate with each
other.
ATTENTION
In a VLAN environment, the user must set Redundant Port Coupling Port and Coupling
Control Port to join all VLANs, since these ports act as the backbone to transmit all packets of
different VLANs to the different PT series Ethernet switches.
Ring Coupling for Turbo Ring
Switch A: "Coupler"
Switch B Switch D
Switch C
Main Path
Coupling Port
Backup Path
Coupling
Control Port
To configure the ring coupling for a Turbo Ring, select two PT series Ethernet switches (e.g.,
Switch A and B in the above figure) in the ring, and another two PT series Ethernet switches in the
adjacent ring (e.g., Switch C and D).
Select two ports on each switch to be used as coupling ports and link them together. Next, assign
one switch (e.g., Switch A) to be the coupler and connect the coupler’s coupling control port with
Switch B (for this example).
The coupler switch (i.e., Switch A) will monitor switch B through the coupling control port to
determine whether or not the coupling port’s backup path should be recovered.
Ring Coupling for Turbo Ring V2
Switch B
Switch A
Switch D
Switch C
Main Path
Coupling Port (Primary)
Coupling Port (Backup)
Backup Path