Pulse code division switching technology exchange is currently the main direction of development, formed by the division of the digital pulse code switching can be done two integrated communication network, the integrated switching and transmission, and transfer calls and shown with a variety of other services such as comprehensive . Pulse code division switching unit is a continuation of the basic hours of T-connector, which can be used alone to form non-blocking network connecting the small hours of capacity, can and S-type connector with the composition of large-scale time-division digital switching network. This division is prepared to a T-connector used alone to illustrate the T-connector of the circuit division, and the concrete realization of the exchange follow the principle.

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