ACA Connects names Bill Tortoriello, ex-UScellular and AT&T, director-regulatory affairs … Aviatrix cloud networking company hires Splunk CEO Doug Merritt as CEO-president, succeeding Steve Mullaney; Merritt also becomes board chairman … Dish announces resignation of Executive Vice President-Chief Operating Officer Narayan Iyengar, saying he will provide “transition support for a brief period of time” … Communications security platform Pavion promotes Alan Rosenkoff to chief marketing officer ... PCTel elects Ocolo’s Anthony Rossabi, also ex-Recovery Point Systems CEO, to its board ... Postmedia names lead director Peter Sharpe interim chair, replacing departed Executive Chair Jamie Irving.