The submarine Internet cable system consists of two parts: underwater equipment and onshore equipment.

      The underwater equipment is mainly composed of optical cables, optical amplifiers/repeaters and underwater branch units.

      Onshore equipment mainly includes fiber optic terminals, remote power supply equipment, line monitoring equipment, network management equipment and marine grounding devices.

      The fiber optic terminal is responsible for signal processing, sending and receiving at both ends. Detection equipment includes alarm monitoring, fault location, etc. These are easy to understand.

      As we all know, although the speed of the optical cable is very fast, the transmission distance of the signal is limited. Due to the loss of light, it cannot be transmitted without limitation.

      Therefore, for long-distance transmission, an additional repeater (signal amplifier) is required between the two. The repeater requires power. Therefore, "remote power supply equipment" is used.

      Both ends of the submarine cable system have been equipped with remote power sources on land. It solves the power supply problem by supplying power to the submarine repeater through the remote power cable on the submarine cable.