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Design Help

I am building a network and need to provide data from a new site to an existing site via a tie-in to their network.

4 sites: Site A, B, C, and X.
I need to get data from Site A to Site C, by way of Site B.

Data is either Ethernet or Modbus over TCP/IP, but there will be voice data on the line to be pulled out and connected to a pbx and associated hardware on both ends.

Site C and X are connected via long-haul Microwave link.
Site B is at one of the towers connecting Site C and X.
Site A and B have a fiber optic cable running between them as well as an antenna and dish to establish a microwave link setup, to be used in the likely event the fiber connection is lost.

Access to Site B is limited and unmanned.

At site A and B, what hardware do I need to merge/bridge these two links, giving priority to the Fiber as available, but automatically switching to microwave when Fiber is down? I need to provide a single connection to the unknown equipment at Site B for the tie-in.

Thus far we have a 1841 Router for Site A and Site B and a Fiber Router for Site A. I suspect we will need a duplicate fiber router at Site B and a smartswitch, bridge, or similar on both ends to get everything talking.

Thank you!


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