Abstract: A method and apparatus is provided for presenting a design of a fiber-optic network. In one aspect, a server receives from a client device a request for a diagram of the design. The server accesses a data-structure representing the design, generates a representation of a cable run, and transmits the representation to the client device for display. In another aspect, the server transmits to the client device an indication that the cable run is illegal and receives from the client device an indication of a user-specified cable run. Subsequently, the server modifies the data structure to replace the illegal cable run with the user-specified cable run.