PT-90 3519 IPPBX uses embedded technology, modular design, and complies with the technical requirements of ITU-T Recommendations. It adopts the most advanced FPGA technology and SMT technology to develop and produce a new generation of IPPBX multimedia exchange that truly meets user needs. platform. The PT-90 3519 IPPBX adopts a standard 19-inch 3.5U-high, plug-in card structure with a total of 19 slots. The power supply disk occupies 2 slots, the main control disk occupies 2 slots, and the service disk has 15 slots. All boards support hot swap.