A system and method of providing a dynamic optical network topology according to topology determinations made by a network control is disclosed. The ropeboard comprises an elongated platform having a longitudinal platform axis and a top surface shaped for a user to stand thereon, and a coupler for rotatably coupling the platform to the support rope so that the platform can be rotated about its longitudinal axis. The photovoltaic module is put on a frame unit and is connected with a load unit. When the closure is engaged on the reservoir, the first applicator head is immersed in the reservoir, while the second applicator head remains visible. A prescribed gap exists between the one side position and the terminal-fixing portion.