CMX865A DTMF Codec/FSK Combo

CMX867A Low Power V.22 Modem

CMX868A Low Power V.22 bis Modem IC

CMX869B Low Power V.32 bis Modem

CMX850 Communications Controller

CMX661 Dual SPM Decoder for Pair Gain Applications

CMX866 V.22bis Modem with AT Command Set

CMX878 V.22 bis Modem plus DAA

CMX602B Calling Line Identifier plus Call Waiting

CMX612 Calling Line ID plus Dial Tone Decode for VMWI (Voice-Message Waiting Indicator)

CMX631A SPM Detector

CMX635 ISDN Subscriber Processor

CMX641A Dual SPM Detector plus Payphone Security

CMX673 Call Progress Tone Detector

CMX683 Call Progress and Voice Detector

CMX860 Telephone Signalling Transceiver

FX/MX604 V.23 Compatible Modem

CMX264 Frequency Domain Split-Band Scrambler

CMX654 V.23 Transmit Modulator

FX/MX019 Digitally Contolled Quad Amp Array

FX029 Dual Digitally Controlled Amp Array

FX614 Bell 202 Compatible Modem


Voice, Signalling and ISDN Products for Wireline Telecom Applications
CML's comprehensive range of wireline telephone, signalling and data ICs covers all current communication requirements
Wireline Telecom Products
CML's wireline products, which cover all aspects of a telephone system's operating requirements in the analogue, digital and mixed signal fields, are employed worldwide in all types of communication application.

Generally, this encompasses such schemes as voice telephony, wireline signalling and data, and the wide-ranging communications and control applications offered by an embedded µController.

CML offers the following services:
  • Design solutions for wireline telephony products
  • Design solutions for wireline data products
  • Product design consultancy

CML's highly integrated ICs perform the majority of telecoms voice, signalling and data functions whilst demanding very little power or µC assistance, a factor that often means that the product can be line powered.

Analogue, digital and mixed-mode (POTS-to-ISDN) products are also available singularly, or in multi-feature combinations.

The telephony range of IC products covers all of the voice and signalling requirements of a modern day telephone system. From Rx/Tx DTMF, calling-line ID and call progress functions through-to voice recognition in both the digital and analogue domains, these products also offer on-chip line/phone interfacing.

The wireline data IC range covers most relevant ITU-V recommendations (V.32 bis, V.32, V.22 bis, V.22, V.23 and V.21) and compatible Bellcore data specifications to provide data rates from 75bps to 1440bps and modulation schemes of FSK, DPSK and QAM.
Additionally, these single chip wireline date products offer a full suite of wireline signalling functions to cater to complete system operations from line and call set-up right through to the completed data transaction.

< < < < < Please use the links on the left to view the relevant product overviews.

Wireline Data Product Comparisons
Product Signalling Wireline Data Audio Supply
CMX869B
V.32 bis Modem		 Tx/Rx: DTMF, Tones
and Call Progress		 V.32 bis, V.32, V.22 bis,
V.22, V.23, V.21 (and Bell)		   3.0 to 3.6 V
CMX868A
V.22 bis Modem		 Tx/Rx: DTMF, Tones
and Call Progress		 V.22 bis, V.22,
V.23, V.21 (and Bell)		   2.7 to 5.5 V
CMX867A
V.22 Modem		 Tx/Rx: DTMF and Tones V.22, V.23, V21 (and Bell)   2.7 to 5.5 V
CMX878
V.22 bis Modem + DAA		 Tx/Rx: DTMF, Tones
and Call Progress		 V.22 bis, V.22,
V.23, V.21 (and Bell)		   2.7 to 5.5 V
CMX866
V.22 bis Modem
with AT Command Set		 AT Command Set
Tx/Rx: DTMF and Tones		 V.22 bis, V.22, V.23
and V.21 (and Bell)		   2.7 to 5.5 V
CMX865A
DTMF Codec/FSK Combo		 Tx/Rx: DTMF V.23, Bell 202   3.0 to 3.6 V
CMX860
Telephone Signalling
Transceiver		 Tx/Rx: DTMF
Call Progress Decode		 V.23, Bell 202   2.7 to 5.5 V
CMX850
Communication Controller		 Tx/Rx: DTMF
Call Progress Decode
CAS Detect/Generate		 V.22 bis, V.22, V.23, V21
(and Bell)		   3.0 to 3.6 V
CMX654
V.23 Tx Modulator		 CLID Generate V.23 Tx   3.0 to 5.5 V
CMX635 ISDN Subscriber
Processor		 Core ISDN Voice, Signalling and Data Functions  
FX/MX614
V.23/Bell 202 Modem		   V.23 and Bell 202   2.7 to 5.5 V
FX/MX604
V.23 Modem		   V.23   3.0 to 5.5 V

 

Wireline Telephony Product Comparisons
Product Signalling Telephony/Data Audio Supply
CMX683
Call Progress and
Voice Audio Detector		 Call Progress Detect   Voice Audio Detect 2.7 to 5.5 V
CMX673
Call Progress Detector		 Call Progress Detect     2.7 to 5.5 V
CMX661
Dual SPM Decoder		 2 x SPM: 12kHz and 16kHz     2.7 to 5.5 V
CMX641A
Dual SPM and
Security Tone Decoder		 2 x SPM: 12kHz and 16kHz
ASK: 12kHz and 16kHz		     2.7 to 5.5 V
CMX631A
SPM Detector		 SPM: 12kHz and 16kHz     3.0 to 5.0 V
CMX612
CLI and VMWI Detector		 CLI, CIDCW and VMWI V.23 / Bell 202
Demodulation		   2.7 to 5.5 V
CMX602B
Calling Line ID Detector		 CLI and CIDCW V.23 / Bell 202
Demodulation		   2.7 to 5.5 V
CMX264
Split-band Scrambler		     Voice Scramble 4.5 to 5.5 V
FX/MX029
Dual Amp Array		 2 x Digitally Controlled Low Noise Amplifiers 4.5 to 5.5 V
FX/MX019
Quad Amp Array		 4 x Digitally Controlled Low Noise Amplifiers 4.5 to 5.5 V


Glossary
AFSK Audio Frequency Shift Keying.
Bell 202 Standard for asynchronous 1800bps full duplex modem.
C-BUS CML's serial data and control system used to communicate digital information between the system's µP or µC and peripheral ICs.
CIDCW Caller Identification on Call Waiting.
CLI Calling Line Identification: a telephony network service that transmits the caller's telephone number and, in some systems, the caller's name to the called party's telephone equipment during the ringing signal or when the call is being set-up but before the call is answered - also refered to as 'Calling Line ID', 'CLIP', 'CLID' and 'CID'. Generally the calling number is shown on a screen of the receiving party's telephone set (if so configured).
Codec A single device or function comprising both enCOder and DECoder sections.
DTMF Dual Tone Multi Frequency signalling. Generally, a telephone signalling system employing four tones from a low group, and three or four tones from a high group, comprising twelve to sixteen different unique tone-pairs.
DPSK Differential Phase Shift Keying.
FSK Frequency Shift Keying: a form of frequency modulation used to transmit two states of a signal each as separate frequencies. FSK is characterised by a frequency spacing of 1.
ISDN Integrated Services Digital Network: a circuit-switched telephone network system, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher speeds than that available with the Public Switched Telephone Network.
ITU-T International Telegraphic Union - Telecommunications: (includes the CCITT and CCIR) is an international telecommunications standards agency.
PCM Pulse Code Modulation: a process by which an analogue signal is sampled and converted to a binary code for transmission.
The magnitude of the analogue signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code.
POTS Plain Old Telephone System: the original basic analogue telephone system (PSTN).
QAM Quadrature Amplitude Modulation: a hybrid amplitude/phase modulation technique that allows the transmission of four bits of information during a signaling interval, and requires less bandwidth than normal amplitude or phase modulation techniques.
Rx The short-cut term for a receiver or receive operation (of any genre).
SPM Subscriber Pulse (or Private) Metering: a method of measuring wireline telecom 'call' periods.
Tx The short-cut term for a transmitter or transmit operation (of any genre).
USART Universal Synchronous-Asynchronous Receiver/Transmitter. Handles both serial synchronous data and asynchronous data, adding start and stop bits and performing parity checks as required.
VMWI Visual (or Voice) Message Waiting Indicator: an FSK message sent without power-ringing to a CPE to activate an LED or other visual indicator on the receipt of voice mail at the local phone company.
VoIP Voice Over IP: any telephony application that can be enabled across a packet-switched data network via Internet Protocol.
WLL Wireless Local Loop: a wireless communications system used to extend the range/capacity of a wireline communications system in areas where there are no copper telecommunication cables or it is uneconomical or physically difficult to install them.