processes for each shared_servers

Hello Friends,
Can some through light on
HOwmany processes required for each shared servers.
As per the oracle docs, each shared_server supports 10 connections.
I want to know howmany processes required if I have 1000 ( one thousand) shared_servers?
Any rule of thumb for what are the other parameters need to change when we change the shared_servers parameter?

I changed dispatchers parameter also.

Thank you,
Hari

Want to give some more info on this question, I am setting this parameter in Oracle 11g RAC, cluster environment.

Thank you,
Hari