OptiX OSN 8800 is mainly used in national trunk lines, regional / provincial trunk lines and metropolitan area networks. It integrates the functions of ROADM, T-bit electrical cross, 100M-100G full-grain scheduling, , 40G / 100G transmission, rich management and protection functions, for operators to build end-to-end OTN / WDM backbone transmission solutions to achieve large-capacity scheduling and ultra-wideband intelligent transmission. The OptiX OSN 8800 T64 / T32 / T16 can be configured as a complete OTN end-to-end network. It can also be used with the OptiX BWS 1600G, OptiX OSN 1800, OptiX OSN 9800, and with NG-SDH / PTN or Datacom Equipment, mixed network, to achieve a complete transmission solution.Huawei OptiX OSN 8800 Power Interface Board TN51PIU A PIU board is used to power boards inside a subrack. Accesses DC power in a range from -40 V to -72 V and provides lightning protection and power filtering functions. TN51PIU is Power Interface Board, applied to Huawei OptiX OSN 8800 T64 Subrack and 8800 T32 Subrack. TN51PIU part number is 03020JRQ, some other version like TN11PIU, TN16PIU, and TN18PIU with different system compatibility and feature supported.