Telephone answering device with direct telephone line interface
A telephone answering device with a direct telephone line connection eliminates the need for a transformer, optoisolators and relays that are normally used in telephone answering devices to isolate the telephone answering device system from the central office circuit. Isolation is instead achieved d...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A telephone answering device with a direct telephone line connection eliminates the need for a transformer, optoisolators and relays that are normally used in telephone answering devices to isolate the telephone answering device system from the central office circuit. Isolation is instead achieved directly at the exposed metal points of the system by physical isolation, switched isolation, resistive isolation and dielectric isolation. |
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