Moxa Technologies EDS-405A User Manual download pdf (Page 37)

EDS-405A/408A Series User’s Manual Featured Functions

3-20

Using Communication Redundancy

Setting up Communication Redundancy on your network helps protect critical links against failure,

protects against network loops, and keeps network downtime at a minimum.

The Communication Redundancy function allows the user to set up redundant loops in the

network to provide a backup data transmission route in the event that a cable is inadvertently

disconnected or damaged. This is a particularly important feature for industrial applications, since

it could take several minutes to locate the disconnected or severed cable. For example, if the

EDS-600 is used as a key communications component of a production line, several minutes of

downtime could cause a big loss in production and revenue. The EDS supports three different

protocols to support this communication redundancy function— Rapid Spanning Tree/

Spanning Tree Protocol (IEEE 802.1W/1D), Turbo Ring, Turbo Ring V2 and Turbo Chain.

When configuring a redundant ring, all switches on the same ring must be configured to use the

same redundancy protocol. You cannot mix the “Turbo Ring,” “Turbo Ring V2,” and STP/RSTP

protocols on the same ring. 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

Turbo Ring Turbo Chain STP RSTP

Topology Ring Ring Chain Ring, Mesh Ring, Mesh

Recovery Time < 20 ms < 300 ms < 20 ms Up to 30 sec. Up to 5 sec

NOTE

Most of Moxa’s managed switches now support three proprietary Turbo Ring protocols:

(1) “Turbo Ring” refers to the original version of Moxa’s proprietary redundant ring

protocol, which has a recovery time of under 300 ms.

(2) “Turbo Ring V2” refers to the new generation Turbo Ring, which has a recovery time

of under 20 ms.

(3) “Turbo Chain” is a new Moxa proprietary protocol with unlimited flexibly to allow you

to construct any type of redundant network topology. The recovery time is under 20 ms.

In this manual, we use the terminology “Turbo Ring” ring and “Turbo Ring V2” ring to

differentiate between rings configured for one or the other of these protocols.

Gigabit Ethernet Redundant Ring Capability (< 50 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. The

EDS-600, 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

(Turbo Ring) or 50 ms (Turbo Ring V2).

Gigabit Turbo Ring

Recovery Time < 50 ms

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Moxa Technologies EDS-405A User Manual Page 37

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