Switch Element Capacities in Access Area Digital Switching Systems

摘要

The capacity of a digital circuit switching system is defined in terms of its four major elements: the traffic offered by the interface element, the maximum traffic carried by the switch matrix, the maximum number of call attempts handled by the control processor, and the maximum number of calls handled by the signaling elements. These element capacities may be engineered for the expected traffic (e.g., call attempts and holding times), the performance objectives (e.g., blocking probabilities and tolerable delays), the processor capabilities (e.g., speeds, memory sizes, service features), and the signaling techniques (e.g., common channel or per-channel signaling). In a properly engineered system, the interrelations between the capacity of all elements should be considered. This report discusses such interrelationships and characterizes representative switch configurations on the basis of the four major elements.