Up until that point everything you have done in relation to this position should be aimed at communicating your value to the employer. It is very difficult to talk about salary when you have yet to determine your duties of the position or demonstrate your value. Only after you have completed the interview are you ready to talk about money. If the interviewer tries to bring up the money question early in the interview, try to delay your answer until the end of the interview. I can negotiate better terms at my first performance review.
Employers are willing to pay for good performance.
If you have to settle for less than what both you and the job are worth, seriously consider looking for another job. You will probably be unhappy knowing you are underpaid. And the performance review may not be translated into a higher salary. Your initial base salary will largely determine your future salaries. Once I'm offered the job, I should immediately let the employer know whether or not I'll accept it.