Everybody and their brother it seems does one of these sooner or later. I've seen the better part of 2 dozen in various configurations over the years. I don't think I exactly duplicated any one version, but I gave a generic basic design credit to "various" JIC so no one thinks I swiped anything. 2260s Constellation class
^It's not clearly defined, but the general idea is a relatively small ship with a primarily defensive operations profile and a shorter operations endurance. There is some crossover with escort vessels (like the Defiant).