1. Optical Line Production bypass device 2. Monitors optical connections via LOS Loss ... CPU built-in OLP6300-BP is a bypass protection device in OLP6300 Fiber Line Protection product series. When ... stability, it can be widely used in PDH, SDH system, C/DWDM system, electric power communication private ... Upgrading Optical Bypass Deivce, bypass protection device, Fiber Line Protection system