CDC for oracle Network requirements

Dear,

I would like to inform about the requirements, specially related to the network. What
if Oracle and SQL Server or on separated locations across the world, will an
ISDN connection be enough or do we need fibernet. Will this be sufficient for
the connection & datatransfer between CDC services and LogMiner? we expect around 10 millions (changed) records a day.

What if there are more transactions than we can process, could be related to the slow network connection?

Is there a kind of buffer for when transactions are comming in, while we are processing them?

Thanks,

Bram