| 摘要 |
In a circuit arrangement for centrally controlled telecommunication trunk exchanges, including PCM telephone trunk exchanges, with line trunk groups with submatrices, which are connected with duplicate central processors and duplicate switching matrices, line trunk groups connected with duplicate switching matrices over two link circuit systems and each having, among other things, a submatrix and a local controller, are divided into two categories. Concentrators are always connected to one line trunk group in each category. For the loading of the controllers and concentrators with new programs and/or data, one processor continues to perform the switching procedures, while only the controllers in the first category remain connected with it, while the concentrators continue to make connections only over the line trunk groups in the first category. The other processor is connected to the controllers in the second category and performs loading procedures for and through them. Thereafter, connections are established over line trunk groups in both categories with the aid of both processors and the line trunk groups in the first category are then blocked with respect to new information, and only connections that are in the process of formation or already in existence are continued. Next, the other processor loads the first processor and the latter loads the line trunk groups in the first category. Total shutdown of the system when programs, data and/or processors are changed is avoided.
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