... mount structure, it is composed of a frame, a main control card, a business card and other main parts. A single card can support 16 pon ... : system main control unit, power supply and other key modules all can be copied as a back up by 1:1 mode, to ... speed switching, QoS,MPLS,NAT,bandwidth control,multicast and other advanced functions, providing a strong support of value-added service for users.4 ...