A simulation system that simulates a length of communication media is disclosed that is tunable. A compressing device is provided that includes a plurality of linear drive actuators located along side a compression chamber to both reduce heightsize of the compressing device, and provide a more uniform compression force to the can. The resistance correction circuit includes a first resistor whose stress-resistance value relationship is a first relationship, a second resistor whose stress-resistance value relationship is a second relationship, and a correction section that controls the resistance value of a correction target resistor. The small opening also emits daylight thus reducing the possibility of vegetation growing in the gutter.