User`s manual

TN-5516/5518 Series Featured Functions
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Private MIB information
Switch Object ID
Setting Description Factory Default
enterprise.8691.7.28 Indicates the TN-5516’s enterprise value. Fixed
enterprise.8691.7.27 Indicates the TN-5518's enterprise value. Fixed
NOTE: The Switch Object ID cannot be changed.
Using Communication Redundancy
Communication redundancy on your network helps protect critical links against failure, protects against
network loops, and keeps network downtime at a minimum.
Communication redundancy functions allow 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 TN-5500 is used as a key communications component of a
production line, several minutes of downtime can result in a big loss in production and revenue. The TN-5500
supports four different protocols for communication redundancy—Rapid Spanning Tree Protocol
(IEEE-802.1w), Turbo Ring, Turbo Ring V2, and Turbo Chain.
When configuring a redundant ring, all switches on the same ring must be configured using the same
redundancy protocol. You cannot mix the Turbo Ring, Turbo Ring V2, Turbo Chain, and STP/RSTP protocols
within a ring. The same rule applies to using Turbo Chain. The following table lists the key differences between
each feature. Use this information to evaluate each the benefits of each, and then determine which features are
most suitable for your network.
Turbo Ring V2 Turbo Ring Turbo Chain STP RSTP
Topology Ring Ring Ring, Mesh Ring, Mesh Ring, Mesh
Recovery Time < 20 ms < 300 ms < 20 ms Up to 30 sec. Up to 5 sec
NOTE Most managed switches by Moxa support two proprietary Turbo Ring protocols:
• Turbo Ring refers to the original version of Moxa’s proprietary redundant ring protocol, which has a
recovery time of under 300 ms.
• Turbo Ring V2 refers to the new generation Turbo Ring, which has a recovery time of under 20 ms.
The Turbo Ring Concept
Moxa developed the proprietary Turbo Ring protocol to optimize communication redundancy and achieve a
faster recovery time on the network.
The Turbo Ring and Turbo Ring V2 protocols designate one switch as the master of the network, and then
automatically block packets from traveling through any of the network’s redundant loops. In the event that one
branch of the ring gets disconnected from the rest of the network, the protocol automatically readjusts the ring
so that the part of the network that was disconnected can reestablish contact with the rest of the network.