	digital communications dcai o buys fox unit digital communications associates inc said it agreed with fox technology inc foxt o to buy its fox research inc unit for a cash payment and the assumption of liabilities of around mln dlrs the company said part of the agreement includes payment of up to an additional mln dlrs based on the performance of the unit in the year following the closing the company said the deal is expected to be closed in mid august fox research develops makes and markets local area networks for personal computers reuter 
