| 单词 | cordboard |
| 释义 | cordboard A manual switching technology that requires the operator to establish connections on a plug and jack basis, with the plugs on cords and the jacks mounted on a board. As was the case with the earlier switchboard technology, the cordboard operator establishes a unique physical and electrical connection that remains in place for the duration of the call.When either party disconnects, the operator is alerted and manually disconnects the circuit, which then becomes available for use in support of another call.The size of such switches, the complexity of interconnecting long distance calls across multiple switches, and the labor intensity of this approach all contributed to their functional obsolescence many years ago. Although cordboards were rendered technically obsolete by automatic step-by-step (SxS) switches in 1891, many thousands remained in service for many years, and many remain in service to this day. See also switchboard, SxS, and tip and ring. |
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