LAN throughput requirements for replicated enqueue server

Hello to everyone.
We are currently running a SAP system on Netweaver 7.0 and plan to put in place a high availability solution based on replicated enqueue server.
I would like to have my enqueue server on one site and the replicated enqueue server on a another site, 50 km away from the first one.
What are the minimal network requirements to ensure the replication would work without any problem: throughput and overall latency ?
According to your experience, does separating the enqueue server and the replicated enqueue server with 50 km makes sense ?
Thanks for our help.
Best Regards to all.
Pascal.

Dear Pascal,
if you are using a standalone enqueue server, any latency between the enqueue server and the replication server will add to the enqueue response time. You can of course, still pipeline requests, but the response time of a single enqueue request will be increased by two times the network latency (since the enqueue server has to inform the replication server about what has to be altered in the replicated enqueue table, and wait for a response that this has been successfully replicated).
It highly depends on what you want to do if this will be a serious problem. However, enqueue functionality is but a small part of an application. I would not expect enqueue operations to add to more than a single digit percentage of the overall runtime.
Best Regards,
Tim

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