| 摘要 |
A universal station identification circuit arrangement for use with central office equipment that utilizes either differential or longitudinal detection methods is adapted to be connected to the tip party's subscribers drop in a two-party line without requiring access to or rewiring of the tip party's telephone. The circuit arrangement may be fabricated in a single unit which includes a ringer isolator and ANI mark circuits. The ringer isolator and the ANI mark circuits may also be used individually.
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