IC adds voice mail waiting to Caller ID chip range

8 November 2000 Telecoms, Datacoms, Wireless, IoT

The CMX612 has been added to the range of calling line identification (CLI) circuits from CML. The CMX612 adds VMWI (voice mail waiting indication or visual message waiting indicator) signal detection to the existing capability for Caller ID and Call Waiting ID. With the growth in use of voice mail systems customers are demanding adjunct boxes or feature phones with the ability to detect that messages are waiting on the voice mail server. The presence of a message is indicated by sending an FSK data burst to the subscriber's feature phone or adjunct box or by altering the dial tone; in some implementations both methods are used.

CMX612 provides the filtering and detection circuitry to meet both of the major standards for VMWI. A dual tone, 350 plus 440 Hz, detector used for stuttered dial tone (SDT)-based systems. For CLASS (custom local area signalling services) implementations of VMWI (An FSK based system.), the CMX612 has a 2130/2750 Hz tone alert detector and a 1200 baud FSK v.23/Bell202 compatible asynchronous data demodulator. The demodulator includes a data retiming circuit which eliminates the need for a UART in the controlling microprocessor.

The CMX612 also offers greater design flexibility for the Caller ID and Call Waiting ID functions through the introduction of a pair of adjustable gain differential input amplifiers which enable connection of the device to the tip/ring or across the telephone hybrid. By choosing the input source the designer can use the impedance of the hybrid to reduce the effects of near end voice and hence improve 'talk off' and 'talk down' performance in Caller ID Call Waiting (CIDCW) applications. Tip/ring detection will be needed to meet the proposed Bellcore MEI standard.

The CMX612 is packaged in either 20-pin TSSOP or 22-pin PDIP. An evaluation board is available.

Further reading:

Wi-Fi 6 and Bluetooth LE co-processor
Altron Arrow Telecoms, Datacoms, Wireless, IoT
STMicroelectronics has released its ST67W611M1, a low-power Wi-Fi 6 and Bluetooth LE combo co-processor module.

Read more...

---

Improving accuracy of outdoor devices
iCorp Technologies Telecoms, Datacoms, Wireless, IoT
In a real-world environment, accessing a direct satellite signal is not always possible, and it cannot be relied upon as the only solution to provide a device with accurate location at all times.

Read more...

---

New 3dB hybrid couplers
Electrocomp Telecoms, Datacoms, Wireless, IoT
Designed to facilitate the continued evolution of high-frequency wireless systems in various market segments, the new DB0402 3dB 90° hybrid couplers provide repeatable high-frequency performance compatible with automated assembly.

Read more...

---

Next-level Software Defined Radio
IOT Electronics Telecoms, Datacoms, Wireless, IoT
Great Scott Gadgets has announced the HackRF Pro, a powerful evolution of its popular Software Defined Radio (SDR) platform designed for engineers and enthusiasts.

Read more...

---

High-performance Zigbee and BLE module
iCorp Technologies Telecoms, Datacoms, Wireless, IoT
The KCMA32S from Quectel boasts an ARM Cortex-M33 processor with a frequency of up to 80 MHz, and supports Zigbee 3.0, BLE 5.3 and BLE mesh.

Read more...

---

Championing local PCB manufacturing
Master Circuits Telecoms, Datacoms, Wireless, IoT
Master Circuits, founded in 1994 by Peter Frankish in Durban, was born from the vision to meet the growing local demand for quick-turnaround printed circuit boards in South Africa.

Read more...

---

How IoT-driven smart data helps businesses stay ahead
Trinity IoT Telecoms, Datacoms, Wireless, IoT
With around 19 billion IoT devices globally, embedded in everything from machinery to vehicles to consumer products, reliable data is plentiful.

Read more...

---

IoT-optimised LTE Cat 1 bis module
iCorp Technologies Telecoms, Datacoms, Wireless, IoT
Quectel’s EG915K-EU is an LTE Cat 1 bis wireless communication module specially designed for M2M and IoT applications.

Read more...

---

Chip provides concurrent dual connectivity
EBV Electrolink Telecoms, Datacoms, Wireless, IoT
The IW693 from NXP is a 2x2 dual-band, highly integrated device that provides concurrent dual Wi-Fi 6E + Wi-Fi 6 and Bluetooth connectivity, supporting four different modes.

Read more...

---

The 6 GHz band radio solution
Altron Arrow Telecoms, Datacoms, Wireless, IoT
Analog Devices’ 16 nm transceiver family offers a highly integrated solution for this new frequency band, featuring low power consumption and high performance.

Read more...

---