| 摘要 |
<p>CERBONE R L 4 ON-HOOK/OFF-HOOK STATUS CHECK CIRCUIT An on-hook/off-hook status check circuit is disclosed which is connectable between a telephone subscriber loop and a telephone station set. The circuit, upon activation, provides adjunct telephone station equipment with a predetermined sequence of outputs from two opto-isolator circuits, the sequence identifying the onhook or off-hook status of the telephone set. The circuit may be used with adjunct station equipment in accordance with station set modularity, loop transmission and signaling, and central office traffic engineering objectives.</p> |
