Thanks for your comments!

My favorite option is using the data pump utility.
To avoid transferring the dump file between the nodes I thought running expdp and impdp from the target database host,as the following example:
Code:
expdp user/pwd  tables=T1,T2,T3,....,Tn  NETWORK_LINK=source_database_link directory=CDRS_DIR dumpfile=CDRs.dmp logfile=expdpCDRs.log parallel=4
impdp user/pwd tables=T1,T2,T3,....,Tn directory=CDRS_DIR dumpfile=CDRs.dmp logfile=impdpCDRs.log parallel=4
What do you think?