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HSCANDXTCSSCODING

更新时间： 2024-11-15 23:56:39

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CMX866 Operation with Low Level Commands

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Application Note

CML Microcircuits

CMX866 Operation

with Low-Level Commands

COMMUNICATION SEMICONDUCTORS

AN/Telecom/866/Commands/1 January 2003

1 Introduction

The CMX866 is a V.22bis modem IC that was designed to connect to off-the-shelf

V.22bis-capable modems using industry standard “AT” commands. Special AT

commands must be used to allow the CMX866 to perform low-level functions such

as DTMF generation and programmable dual tone detection. The purpose of this

application note is to describe how the CMX866 can be made to perform these types

of functions.

1.1 Contents

Introduction......................................................................................................... 1

1.1 Contents ...................................................................................................... 1

Examples............................................................................................................ 1

2.1

DTMF Generation........................................................................................ 2

DTMF Detection........................................................................................... 2

Programmable Tone Generation ................................................................. 3

Programmable Tone Detection.................................................................... 5

Use Of Hook Switch “AT” Command and the Effect On Impedance

2.2

2.3

2.4

2.5

Presented To Telephone Line ................................................................................ 6

Conclusion.......................................................................................................... 6

2 Examples

The CMX866 can be made to perform a variety of low-level functions with the use of

special AT commands combined with user-defined register values. Once the desired

function(s) has been resolved, the required CMX866 register contents can be

determined. In general, these register contents are loaded into the CMX866 with

special AT commands, and these commands will cause the desired operating mode

to occur.

The CMX866 shares internal register addresses and structure with the CMX868

(V.22bis modem IC without AT command set). Consequently, to determine the

appropriate CMX866 register and setting for a particular operating condition, the

CMX868 data sheet should be consulted. Data sheets for all CML products can be

found at the following internet address:

http://www.cmlmicro.com/products/datasheets/download.htm

CMX866 Operation with Low-Level Commands

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与HSCANDXTCSSCODING相关器件

型号	品牌	获取价格	描述	数据表
HSC-ASP2-F3Q-L	HRS	获取价格	Fiber Optic SC Connector, 9.5/125um, Single Mode, Simplex
HSC-ASPAD2-F3Q-1M(21)	HRS	获取价格	Interconnection Device
HSC-ASPAD2-F3Q-2M(22)	HRS	获取价格	Interconnection Device
HSC-ASPC1-F3A-L	HRS	获取价格	Fiber Optic SC Connector, 9.5/125um, Single Mode, Simplex
HSC-ASPC1-F3Q-L	HRS	获取价格	Fiber Optic SC Connector, 9.5/125um, Single Mode, Simplex
HSC-ASPC2-F3A-L	HRS	获取价格	SC Type Fiber Optic Connectors
HSC-ASPC2-F3Q-L	HRS	获取价格	Fiber Optic SC Connector, 9.5/125um, Single Mode, Simplex
HSC-ASPE1-F3Q-L	HRS	获取价格	暂无描述
HSC-ASPE2-F3Q-L	HRS	获取价格	Fiber Optic SC Connector, 9.5/125um, Single Mode, Simplex
HSC-AT11	HRS	获取价格	SC Type Fixed Attenuators (for single mode)

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