CALLER ID ON TMS320C2XX

Caller ID is a method of transmitting the telephone number and/or name of the

caller to the subscriber via a burst of V23 or BEL202 data during the ringing

phase of a telephone call. Various methods of signaling the start of this

message are used in different countries and this report attempts to identify a

near universal core routine for handling the messages within the DSP

environment. ADSI is an extension of Caller-ID used in some countries to deliver

menu driven options to feature phones, the basic signaling is the same as

Caller-ID except that the messages are sent during the call phase, and there is

a full acknowledgment of the request to send data. This report covers the

reception and decoding of either the Caller-ID or ADSI burst, it does not cover

the interpretation of the burst or the recognition of non-DSP signaling, such as

ringing or line reversal that may occur at the start, nor the need to switch a

matching impedance onto the line. These are considered to be a part of the micro-controller function.

This application report is designed to be used with the Texas Instruments

Caller-ID software package.

Go to the Engineering Design Center to locate information on other TI Semiconductor devices.

(c) Copyright 1998 Texas Instruments Incorporated. All rights reserved.
Trademarks, Important Notice!