| 摘要 |
Exchange operator's positions have a keyboard and VDU at which call details are entered by key operations or automatically from monitors, and its own program-controlled processor and buffer store. The operator's positions are connected via data links to common control equipment with suitable interface circuitry at both ends of the data links. The control equipment has its own program-controlled processor and data recording equipment. In use the control equipment, under control of its processor, polls the operators' positions in "multi-drop" manner and polling stops for the call details to be sent to and recorded by the recording equipment. If a polled position has no message to send it replies with a "no- call" message. The absence of a message from a polled operator's position is interpreted as a fault condition. |
