Moxa Technologies PT-7728 user manual Using Communication Redundancy, Private MIB information

PT-7728 User’s Manual			Featured Functions
1st Trap Community
	Setting	Description	Factory Default
	Max. 30 characters	This specifies the community string to use	Public
		for authentication.
2nd Trap Server IP/Name
	Setting	Description	Factory Default
	IP or name	This specifies the IP address or name of	None
		the secondary trap server used by your
		network.
2nd Trap Community
	Setting	Description	Factory Default
	Max. 30 characters	This specifies the community string to use	Public
		for authentication.
Private MIB information
Switch Object ID
	Setting	Description	Factory Default
	8691.7.13	This indicates the PT-7728’s enterprise	Fixed
		value.
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 PT-7728 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 PT-7728 supports three different protocols for communication redundancy—Rapid Spanning Tree Protocol (IEEE-802.1w)and Turbo Ring, and Turbo Ring V2.

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, and STP/RSTP protocols within a ring. 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	STP	RSTP
Topology	Ring	Ring	Ring, Mesh	Ring, Mesh
Recovery Time	< 20 ms	< 300 ms	Up to 30 sec.	Up to 5 sec

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