DataHub® Tunnelling Options

Why use the Cogent DataHub for tunnelling across a network?

Below we have outlined the top 3 reasons why the Cogent DataHub is the best tunnelling solution available. Download the Free DataHub Tunneling Evaluation Guide.


Why Use Tunneling?
How to Choose a Tunneler
See 22 More Reasons

1. Does the tunneler just move data or does it also move the entire OPC function call?


Cogent DataHub

• The Cogent DataHub keeps all OPC transactions local to the computer, thus fully protecting the client programs from any network irregularities.


Other Tunnelling Solutions

•  Other products expose OPC transactions to network irregularities, making client programs subject to timeouts, delays, and blocking behavior. Link monitoring can reduce these effects, while the Cogent DataHub eliminates them.


2. How does the tunneler behave when the network breaks?


Cogent DataHub

•  The Cogent DataHub mirrors data across the network, so that both sides maintain a complete set of all the data. This shields the clients from network breaks as it lets them continue to work with the last known values from the server. When the connection is re-established, both sides synchronize the data set.


Other Tunnelling Solutions

•  Other products pass data across the network on a point by point basis and maintain no knowledge of the current state of the points in the system. A network break leaves the client applications stuck with no data to work with.

3. Can your tunneler aggregate data from many tunnelers? Or is it a one-to-one relationship?


Cogent DataHub

•  A single tunnel can be shared by multiple client applications. This significantly reduces network bandwidth and means the customer can reduce licensing costs as all clients (or servers) on the same computer share a single tunnel connection.


Other Tunnelling Solutions

•  Other tunnelling products require a separate network connection for each client-server connection. This increases the load on the system, the load on the network and increases licensing costs.


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