oracle database establishes dblink syntax on the client side

When the oracle server does not set up an TNS for the target database, the syntax for setting up an dblink on the client (with permission) is as follows:

 
create database link dblink_name connect to user_name identified by user_psw using 
'(DESCRIPTION = 
(ADDRESS_LIST = 
(ADDRESS = (PROTOCOL = TCP)(HOST = xxx.xx.xxx.xx)(PORT = 1521)) 
) 
(CONNECT_DATA = 
(SERVICE_NAME = orcl) 
) 
)'