Versatile telephone call-charge and security function ICs

7 November 2001 Telecoms, Datacoms, Wireless, IoT

CML's current family of subscriber pulse metering (SPM) ICs offer a versatile and varied menu of features for call-charge metering applications. In addition, the battle against payphone fraud is waged using the CMX641A's selectable 12/16 kHz ASK generator, in combination with an SPM detector, to provide dynamic online security. According to the manufacturer, with simple control and signal interfacing, compact packaging and low-power requirements, each of these products, present the design engineer with the ideal solution to all call-charge or recording application problems.

The products are:

* CMX631A - low voltage SPM detector.

* CMX641A - dual SPM/security detector/generator.

* CMX661 - pair gain dual SPM detector.

Subscriber pulse metering (SPM) functions are employed by an analog telephone system primarily to enable call-charge recording and billing. In order to achieve this, the relevant telephone equipment must be able to accurately determine several factors, amongst which is the ability to measure the duration of the call. CML's SPM IC products have the ability to accurately detect 12 or 16 kHz call-charge tones to most countries' national telephone level and frequency specifications.

(SPM) Pair gain - to allow the transmission of analog SPM timings to be passed over a digital system, the CML SPM devices will provide outputs in a digital format in the tone follow mode. The CMX661 offers an adjustable 'decode bandwidth' for global system implementation.

Interference with the payphone or its telephone line can be detected by interrogation of the remote unit. The CMX641A offers a tone generator/detector facility to form the core of such an interrogation system.

For further information on the functions and applications of CML's SPM, pair-gain and payphone antifraud ICs, contact your distributor, Avnet Kopp (011) 444 2333, [email protected] or www.avnet.co.za

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