Caller ID Modem
by HotHaus Technologies

Software Overview

The HotHaus Caller ID (CLASS) modem software module is fully compliant with the Bellcore 
specification TR-NWT-001273 which is the standard widely used in North America. It provides for 
demodulation of serial binary synchronous signals at 1200 bps using FSK. It is available 
stand-alone or as a PSTN line service for HausWare.
CLASS extracts the message type, the message length, the CLASS data, and the checksum, and buffers 
them for processing by the host function. The CLASS demodulator is based on a delay multiply FSK 
architecture.
A well written and thorough Technical Reference Manual is available describing the CLASS modem and 
how to interface to it via C or assembly. Example C and Psuedocode are included in the manual.
All HotHaus software modules are all designed to operate with minimal MIPS and memory. CLASS has 
been written entirely in assembly. 

Features and Benefits

•	1 MIP and 350 words of ROM are required
•	Compliant with Bellcore specification TR-NWT-001273
•	1200-bps FSK demodulation of CLASS signals
•	Fully re-entrant, each extra port requires only small additional RAM space

Processor and System Requirements

Runs on Texas Instruments TMS320C5x family of DSPs.

Usage Limitations or Performance Considerations

None

Availability

Immediately on 'C5x. Can easily be ported to 'C2xx and other TI fixed-point DSPs.

Company Background and Contact Information

HotHaus are experts in TI fixed-point DSP software algorithms for telecommunications. HotHaus' 
algorithms are ideally suited for advanced telecommunications products such as feature phones, PBX 
or key systems, and general computer telephony products.
HausWare is the flagship of the company's product line, and it provides a complete DSP software 
system architecture specifically for telecommunications products. HausWare is the key to HotHaus 
providing a cost-effective software system solution to our customers.

Contact:	Dan McCallum
		HotHaus Technologies Inc.
		1B - 7218 Progress Way
		Delta BC Canada
		V4G 1H2
		(604) 946-0060
		fax: (604) 946-5811