Datum Inc.

The Irvine maker of time and frequency products for telecommunications networks posted a net loss of $561,000, or 10 cents a share, for the fourth quarter, net income of $68,000, or 1 cent a share, for the previous year’s final three months. Quarterly revenue rose 8% to $25.8 million. For the year, Datum had a net loss of $1.2 million, or 20 cents a share, compared with the previous year’s loss of $1.5 million, or 27 cents a share. Annual revenue fell slightly to $100.2 million.