| 摘要 |
A standalone telephone line status monitoring and reporting devi ce (10) for use between a subscriber's premises loop and the local telephone network is disclosed. The device operates on loop current, external AC or DC power from the subscriber's premises, or internal battery (61). The device passively monitors the status of the premises loop until an alarm condition is detected. When premises communications equipment is on-hook or off-hook, the device detects normal Tip-Ring voltage and current conditions. If an open circuit, short circuit, or invalid loop impedance condition is detected, the device indicates a potential fault in the premises wiring. The device then reports the alarm either by visual or audible indications (11), electronically to an external monitoring device, or by auto-dialing one of two preprogrammed telephone numbers. The fault may be reported over wireline telephone line or radio link (21) to the central office or other location. Additionally, when configured for radio link communications with the central office, the device may be remotely reset.
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