If your server is configured without a local graphics console, you need to attach an alphanumeric terminal (or establish a tip connection) to the server in order to install the system and to run diagnostic tests. For background information, see "About Setting Up a Console".
Alternatively, you can install a local graphics console on the server; see "How to Configure a Local Graphics Console".
For information about establishing a tip connection, see the OpenBoot 3.x Command Reference Manual, an online version of which is included with the Solaris System Administrator AnswerBook that ships with Solaris software.