V.27ter Fax Modem
by HotHaus Technologies

Software Overview

The HotHaus V.27ter fax modem software module is fully compliant with the ITU-T V.27ter 
recommendation, and provides for 4800-bps Group 3 fax modem communications. It is available 
standalone or as a PSTN line service for HausWare. V.27ter also includes V.21 and T.30. 
The V.27ter fax modem includes a fax manager for interfacing with a DSP host (or HausWare), 
supports automatic and manual fax modes, supports voice control and voice request, and will 
generate Calling Tone (CNG) and called station ID (CED). 
A well written and thorough Technical Reference Manual is available describing the V.27ter data 
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. V.27ter has 
been written entirely in assembly. 

Features and Benefits

•	2 MIPS transmitting, 4 MIPS receiving, and 5K ords of ROM are required
•	Fully re-entrant, each extra port requires only small additional RAM space
•	Fallback support to 2400 bps

Processor and System Requirements

Runs on Texas Instruments TMS320C5x family of DSPs.

Usage Limitations or Performance Considerations

Tested against commercial fax machines and fax modems

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