A keystone jack based on a punch down type keystone jack architecture, having a wire layout cover attached to the rear side of the jack body and two cover shells pivotally connected to the jack body for closing/opening the wire layout cover. The IDC housing at the back side of the jack body has a wire-bonding block panel formed of multiple partition plates and a retaining hook located on the distal end of each partition plate to minimize the gap between each two adjacent partition plates, allowing installation of the core wires of the inserted network cable by a punch down type technique or a tool free type technique.