ADSI
(Analog Display Services
Interface)
by D2 Technologies, Inc.

Software Overview

D2's ADSI algorithm module implements all of the physical layer signal processing functions for 
North American ADSI applications according to the Bellcore type 1, type 2, and type 3 voice and 
data transmission interface requirements.  It detects the CPE Alert signal (CAS) tone, sends and 
receives the Bell 202 FSK modem data for on-hook and off-hook transmission, generates DTMF as the 
acknowledgment (ACK) or dialing signal, and detects call progress tone signals.  All of these 
algorithms comply with the Bellcore CPE compatibility test requirements.
The TMS320C5x and TMS320C2xx versions of the ADSI 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 CPE Alert Signal (CAS) tone
•	Detects North American call-progress tones in the presence of voice
•	Generates DTMF signal for acknowledgment (ACK) and dialing
•	Generates Bell 202 FSK signal according to the Bellcore extended ADSI requirements
•	Detects and decodes 1200-baud FSK (Bell 202) modem data

Processor and System Specifications

•	Devices supported: TMS320C17, TMS320C2xx, TMS320C5x
•	Processor resource required:
•	Algorithm category: Telecommunications
TMS320C17
TMS320C2xx (Est.)
TMS320C5x (Est.)
Program memory
3.8 kwords
3.7 kwords
3.5 kwords
Data memory/port
256 words
277 words
277 words
Processor loading worst case
4.0 MIPS
3.5 MIPS
3.0 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 ADSI algorithm module is validated through the following suite of tests which assure 
compliance with Bellcore CPE compatibility requirements for type 1, type 2, and type 3 equipment 
and robust operation in the field:
•	FSK tolerance tests according to Bellcore requirements for on-hook and off-hook transmission: 
amplitude sensitivity, frequency and baud rate variation, twist, seizure delay, drop-out, and 
seizure/mark signal lengths variation
•	D2's CAS tone performance requirements  (which includes Bellcore requirements): tone variations, 
talk-off immunity, talk-down tolerance, and network noise immunity
•	D2's Call Progress tone detector tests (which includes all Bellcore tests) for tone variation, 
talk-off, and talk-down
•	DTMF tone quality for ACK and dialing; FSK signal quality
•	VP Open interface validation – the CIDCW 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 TMS320C17 on-chip ROM operation. The `C5x implementation will be 
available in the 1Q 1996. A demonstration package will be available for the TI EVM50 DSP board. The 
`C2xx version will be available 2Q 1996.

Company Background and Contact Information

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