viavi solutions inc viav  a provider of testing and monitoring equipment for networks announced tuesday that its board has approved a stock buyback program of up to 300 million the new program replaces the former 200 million authorization which expires sept 30 the chandler arizbased company also reaffirmed its firstquarter guidance for revenue of 317 million to 331 million and adjusted pershare earnings of 22 cents to 24 cents the factset consensus is for revenue of 327 million and adjusted eps of 23 cents the guidance comes ahead of an investor day due to kick off at 900 am eastern shares were not yet active premarket but are down 17 in the year to date while the sp 500 spx has fallen 14