Rack-mounted interface cable connecting the panel structure in the device and the rack-mount device

In the optical transmission device, to provide a rack-mounted device (20). Rack-mounted device (20), a rack (21), a rack (21) shelf (1) that is mounted on, can take an open position and a closed position between the rack (21) below the device (1) use via configuring provided with a rotatably mounted cross-section L-shaped panel (2) and a rack-mounted device (20) an interface cable (150) in the easy, reliable, and without the addition of stress connect, also the connection position of the interface cable (150) can be flexibly determined or changed, further, to significantly improve work efficiency.