A communication path control system includes a storage device which stores data of paths between communication nodes; and a communication path selecting device which selects a path candidate for setting a new communication path among path candidates, each of which can be provided as a communication path between the communication nodes. A cathode containing the coated carbon-sulfur composite and a battery constructed with the cathode are also provided. Of these N-glycosylated sites more than 70% are glycosylated with an oligomannose having a structure defined by Man-GlcNAc. In this way, this method avoids the annoying bandwidth switching artefacts that can occur when full bandwidth audio is encoded with a bit budget which is too low to represent the signal within each frequency band. When one remote network intermediary device does not receive the connection test packets within a predetermined timeout interval or has received fragged or damaged packets, the connection between the local network intermediary device and the remote network intermediary device is determined to be abnormal. To design the fiber, \u03bb, the number of missing gaps, d\u039b, the core doping content, \u039b and \u0394n are chosen; and \u0394R is determined using equation 1 so as to obtain a flattened fundamental mode.