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stg beikirch electrical components refer to the aggregate of service equipment provided for a specific group of traffic sources, such as trunk lines, switching devices, and control systems. The fundamental subject of traffic theory is the relationship between traffic volume, call loss, and bundle capacity; therefore, the trunk bundle is a key basic concept in traffic theory. A traffic source is the object served by the trunk bundle, typically referring to user equipment; in a broader sense, upstream equipment serves as the traffic source for downstream equipment. In telephone communications, a traffic source is also called a call source, and the number of service devices contained in a trunk bundle is referred to as the bundle capacity.