N?i ??ng d?ng b?n l? ???c s? d?ng ?? n?i các máng cáp l?i v?i nhau theo chi?u th?ng ??ng.The electrical trunking is offered in two ranges, everyday wiring trunking and busbar trunking. The normal cables trunking method is further obtainable in both metal or PVC.Central Controller: The center of a trunked two-way radio program may be the central