	quantum venture ups computer network cmnt stake computer network technology corp cnt said that quantum venture partners lp a private investment limited partnership has uired an additional shares of cnt common stock raising its stake in cnt to pct from pct of the currently outstanding shares cnt said quantum bought the shares by exercising mln dlrs in warrants bringing its total investment in cnt to mln dlrs cnt also said sand technology systems inc of canada bought two of its channelink networking units for a data processing service for major health care facilities in canada reuter 
