Caller Identification Delivery
by D2 Technologies, Inc.

Software Overview

D2's Caller Identification Delivery (CID) algorithm implements the physical layer signal processing 
functions for North American Caller ID applications according to the Bellcore type 1 voice and data 
transmission interface requirements. It detects and decodes the Bell 202 FSK modem data.
The TMS320C5x and TMS320C2xx versions of the CID algorithm are designed to the VP Open interface, 
the CID algorithm module easily integrates with other VP Open modules, runs in real-time 
concurrently with other VP Open modules, and handles any number of voice ports assigned to the DSP. 
 Like all of D2's algorithm modules, the CID algorithm module consists of robust software that is 
rigorously tested.

Features and Benefits

•	Detects presence of  CID carrier signal
•	Complies with Bellcore SR30 physical layer requirements and SR3004 test requirements for type 1 
equipment
•	Decodes 1200-baud FSK (Bell 202) data

Processor and System Specifications

•	Devices supported: TMS320C17, TMS320C2xx, TMS320C5x
•	Processor resource required:
•	Algorithm category: Telecommunications
TMS320C17
TMS320C2xx (Est.)
TMS320C5x
Program memory
0.3 kwords
0.45 kwords
0.4 kwords
Data memory/port
23 words
20 words
20 words
Processor loading worst case
1.2 MIPS
1.0 MIPS
1.0 MIPS

Usage Limitations or Performance Considerations

The host, voice data input and output, memory allocation, and module to module communication 
interfaces must conform to VP Open as described in the VP Open Software Interface Specification.

Algorithm Verification

D2's CID algorithm module is validated through the following suite of tests:
•	FSK tolerance tests according to Bellcore requirements—amplitude sensitivity, frequency and baud 
rate variation, twist, seizure delay, drop-out, and seizure/mark signal lengths variation
•	VP Open interface validation – the CID module for the TMS320C5x and TMS320C2xx are integrated 
with other VP Open modules and tested concurrently in real-time for multiple voice ports

Availability

Currently available for the TMS320C5x and TMS320C17. A demonstration package is available for the 
TI EVM50 DSP board. The TMS320C17 software is available for on-chip ROM. Implementation for the 
TMS320C2xx will be available 2Q 1996.

Company Background and Contact Information

D2 Technologies, Inc. was founded by David Y. Wong and David M. Lindsay to help companies innovate 
telecommunications and information products with voice processing technology, which include 
telephony and voice algorithms, real-time system software, and development services.


Contact:	D2 Technologies, Inc.
		Attn:  Product Sales
		104 West Anapamu Street
		Suite J
		Santa Barbara,  CA 93101
		(805) 564-3424
		Fax:  (805) 966-2144
		e-mail:  sales@d2tech.com