TELEPHONE LINE TESTING DEVICE AND EQUIPMENT PROTECTOR

摘要

A telephone line testing and power surge attenuating device (131) detects the integrity of a telephone loop connected to a subscriber's modular telephone jack and attenuates potentially damaging power surges. The testing circuit tests the current potential of the line, and, if the current is excessive, presents a visual indication thereof (LED4). If the tip and ring signals of the telephone loop are reversed, reverse polarity is visually indicated (LED1). Otherwise, if the tested current falls within a predefined acceptable range, a visual indication (LED2) that the telephone line is in working order is provided.