Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent
1986-04-21
1988-06-28
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of network terminating interface, subscriber trunk...
H04B 346
Patent
active
047544724
ABSTRACT:
A telecommunication system of the kind having a telephone handset connected to an exchange via a line incorporates a beacon (22) in the line for receiving a question signal from test equipment associated with the exchange and for sending an answer signal to the test equipment. The beacon (22) senses voltages in the two wires making up the line but is otherwise isolated from the line via a diode bridge (20) and a protection circuit (21) and high value resistor R.sub.p. Previously known beacons were connected directly into the line to sense current and thus could not be protected by high value resistors.
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Bingham Michael D.
Motorola Inc.
Schreyer Stafford D.
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