Browse Prior Art Database

Electronic Metering Signal Detector

IP.com Disclosure Number: IPCOM000091284D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Canard, G: AUTHOR [+2]

Abstract

The device detects the call metering signals sent from a central exchange to a private branch exchange. These signals are composed of 50 cps waves applied on both wires of the telephone line. The detector transforms the 50 cps signals into a DC level. This is then detected through a scanner and recorded in the PBX.

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Electronic Metering Signal Detector

The device detects the call metering signals sent from a central exchange to a private branch exchange. These signals are composed of 50 cps waves applied on both wires of the telephone line. The detector transforms the 50 cps signals into a DC level. This is then detected through a scanner and recorded in the PBX.

The circuit is connected in parallel to the PBX trunk line. It comprises essentially a level detector, transistors T1 and T2, an And, transistors T3 and T4, and an integrator, transistors T5 and T6 and capacitor C. The circuit output is connected to the scanner.

The And permits distinguishing metering signals from other signals which are applied only to one line wire, such as ringing signals. The advantage of this detector is that any degradation of the transmission characteristics of the trunk line is avoided.

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