1981-06-15
1983-02-08
Schreyer, Stafford D.
H04B 346
Patent
active
043731210
ABSTRACT:
Substantially identical, unique valued impedance termination networks (26,28) each comprising a resistor (32,38) and a capacitor (34,36) are connected between each telephone subscriber loop conductor (11,13) and ground at the entrance of the loop to the customer's premises (14). The impedance termination networks are balanced to ground for preventing noise from being induced in the loop. In response to an alternating current signal transmitted simultaneously on each conductor from a loop testing apparatus (10), if an impedance termination network is connected between a conductor and ground, the unique impedance value will be measured. The value of the measured impedance is compared with the unique impedance to determine whether there is an open conductor in the loop. Furthermore, a four-layer diode switch (30,40) is connected permanently in series with each loop conductor. In response to a signal greater than the diode threshold voltage, the diode switch breaks down and a path is established directly to the terminal equipment (16). In response to a signal below the threshold voltage the diode switch does not conduct and the loop appears open. Both opens and resistive faults in various sections of the loop may thus be detected and located without mechanically opening the loop.
REFERENCES:
patent: 3636280 (1972-01-01), Wetzel
Sartori Eugene F.
Uhrhane Francis J.
Bell Telephone Laboratories Incorporated
Nimtz R. O.
Schreyer Stafford D.
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