If you wish to use JDBC from a client application or applet, you must have Sybase jConnect to connect to Sybase IQ databases.
Depending on the installation package you received, Sybase IQ may or may not include Sybase jConnect. You must have jConnect in order to use JDBC from client applications. You can use server-side JDBC without jConnect.
For a full description of jConnect and its use with Sybase IQ, see the jConnect documentation available in the online books or from the jConnect web site