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
Further reading:
Simplifying system design
iCorp Technologies
Telecoms, Datacoms, Wireless, IoT
The FGMC63N tri-band MCU Wi-Fi 6E module from Quectel addresses offers integrated connectivity across 2,4 GHz, 5 GHz, and 6 GHz bands in a compact, highly optimised design.
Read more...
Dragino’s connectivity catalogue
Otto Wireless Solutions
Telecoms, Datacoms, Wireless, IoT
Where Wi-Fi demands frequent charging and covers tens of meters, and traditional cellular consumes too much power for battery-operated nodes, LoRaWAN threads the needle.
Read more...
RF filters explained
RFiber Solutions
Telecoms, Datacoms, Wireless, IoT
As RF environments become increasingly crowded, RF filters play a critical role in maintaining signal quality, improving system performance, and ensuring reliable operation.
Read more...
Practical design strategies for 5G
RF Design
Telecoms, Datacoms, Wireless, IoT
The Cavli CQM211 aims to provide a platform that combines strong 5G connectivity with onboard compute capability, as well as interface flexibility that suits both new designs and rapid migrations from earlier products.
Read more...
GigaDevice expands optical communication portfolio
NuVision Electronics
Telecoms, Datacoms, Wireless, IoT
GigaDevice has introduced the new GD32E512 and GD32E252 series MCUs specifically designed for optical module applications.
Read more...
An industry-first Android 16 smart module solution
RF Design
Computer/Embedded Technology Telecoms, Datacoms, Wireless, IoT
The MeiG Smart SLM580 4G Smart Module features native support for Android 16 and covers core frequency bands in major countries and regions worldwide.
Read more...
High performance RF signal conditioning
RFiber Solutions
Telecoms, Datacoms, Wireless, IoT
The AM3269 from Mercury Systems is a high-performance RF preselector module designed to improve receiver sensitivity and signal integrity in demanding electronic warfare, signals intelligence, test, and communications applications.
Read more...
RF filters explained
RFiber Solutions
Telecoms, Datacoms, Wireless, IoT
As RF environments become increasingly crowded, RF filters play a critical role in maintaining signal quality, improving system performance, and ensuring reliable operation.
Read more...
GigaDevice expands optical communication portfolio
NuVision Electronics
Telecoms, Datacoms, Wireless, IoT
GigaDevice has introduced the new GD32E512 and GD32E252 series MCUs specifically designed for optical module applications.
Read more...
Industrial connectivity without compromise
Telecoms, Datacoms, Wireless, IoT
The IR315 combines 4G LTE, Wi-Fi, Ethernet, and VPN technologies into a rugged, industrial-grade platform that enables seamless connectivity across a wide range of applications.
Read more...
printer friendly version