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kws-electr electrical components refer to the aggregate of service equipment provided to a specific group of traffic sources, such as trunk lines, switching devices, control systems, etc. The fundamental research content of traffic theory is to study the relationship between traffic volume, call loss, and bundle capacity. Therefore, the bundle is an important basic concept in traffic theory. A traffic source is the service object of a bundle, usually referring to user equipment; broadly speaking, the upper-level equipment is the traffic source for the lower-level equipment. In telephone communication, a traffic source is also called a call source. The number of service devices contained in a bundle is called the bundle capacity. Figure