EDS-518A Series User’s Manual
Featured Functions
3-17
Turbo Ring and STP/RSTP cannot both be used on the network at the same time. The following
table lists the key differences between each feature. Use this information to evaluate the benefits
of each, and then determine which features are most suitable for your network.
Turbo
Ring
STP
RSTP
Topology
Ring
Ring, Mesh
Ring, Mesh
Recovery Time
< 300 ms
Up to 30 sec.
Up to 5 sec
Gigabit Ethernet Redundant Ring Capability (< 300 ms)
Ethernet has become the default data communications medium for industrial automation
applications. In fact, Ethernet is often used to integrate video, voice, and high-rate industrial
application data transfers into one network. MOXA EDS-518A, which comes equipped with a
redundant Gigabit Ethernet protocol called Gigabit Turbo Ring, gives system maintainers a
convenient means of setting up a versatile yet stable Gigabit Ethernet network. With Gigabit
Turbo Ring, if any segment of the network gets disconnected, your automation system will be
back to normal in less than 300 ms.
NOTE
Port trunking and Turbo Ring can be enabled simultaneously to form a backbone. Doing so will
increase the bandwidth of the backbone, and also provide redundancy. For example, suppose that
two physical ports, 1 and 2, are trunked to form trunk group Trk1, and then Trk1 is set as one
Turbo Ring path, if port 1 gets disconnected, the remaining trunked port, port 2, will share the
traffic. If port 1 and port 2 are both disconnected, Turbo Ring will create the back up path within
300 ms.
The Turbo Ring Concept
The proprietary Turbo Ring protocol was developed by MOXA to optimize communication
redundancy and achieve a faster recovery time on the network.
Turbo Ring protocol identifies one switch as the “master” of the network, and then automatically
blocks packets from traveling through any of the network’s redundant loops. In the event that one
branch of this ring gets disconnected from the rest of the network, the Turbo Ring protocol
automatically readjusts the ring (if possible) so that the part of the network that was disconnected
reestablishes contact with the rest of the network.
