| 摘要 |
A telephone switching office is disclosed wherein connections may be established between conventional analog trunks and time division multiplex lines. A plurality of digital trunks are employed equal in number to the number of incoming and outgoing time slot channels to be switched through the office. Digital trunks associated with incoming channels are provided with shift registers for storing the bit patterns carrying the information for a respective time slot. This information is outpulsed from the shift registers under control of readout pulses derived from a trunk time slot switch which is set by common control to deliver readout pulses in a time sequence that is appropriate to the selected time slot in the outgoing TDM line to which a cross-office connection is desired. In addition, conversion junctor circuits are provided having encoders and decoders which are selectively gated to deliver the digital information to the appropriate time slot of the TDM line involved in the connection by signals derived from a junctor time slot switch whose operation is dictated by common control Advantageously, both the trunk time slot link switch and the junctor time slot link switches are of the crossbar type.
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