| 摘要 |
1,006,127. Automatic exchange systems. STANDARD TELEPHONES & CABLES Ltd. Jan. 17, 1964 [Jan. 18, 1963], No. 2175/64. Addition to 946,263. Drawings to Specification. Heading H4K. In a system comprising a route selection network which simulates a connecting network wherein all free paths are first marked and then, at each stage of the network, one free path is selected by a succession of blocking operations whereafter the path through the connecting network corresponding to that selected by the selection network is set-up, the means for performing the blocking of the paths at each stage are combined into a common test unit and the similar plurality of means for setting-up the path through the connecting network are combined into a common control unit. Since the control units are relatively slow operating more than one may be provided. Preferably the test units are duplicated and either used alternately or one may be kept as a stand-by unit. A standby control unit may be provided. A test unit and a control unit may be combined into a single unit for use in small exchanges. The units may be used on a T.D.M. bases.
|
