GAO ITU Group 3 Fax
by GAO Research & Consulting Ltd.

Software Overview

GAO ITU Group 3 Fax Modem implements the Group 3 fax standard. The Group 3 fax standard is for 
facsimile transmission over the general telephone network. It defines how the facsimile apparatus 
should communicate with each other and how the apparatus should exchange data, for example, images, 
characters, etc. The group 3 standard is composed of six ITU recommendations: V.17, V.21, V.27ter, 
V.29, T.4, and T.30. All, except T.4 have been implemented. T.4 typically runs on a host processor.

Features and Benefits

•	Implemented in the assembly
•	Efficient in memory and computation

Processor and System Requirements

•	Devices supported: TMS320C3x, TMS320C5x, TMS320C54x
•	Algorithm category: Telecommunications
•	Required:
Function
Average MIPS
Data Memory
Program Memory
V.17
11
3 k
3.0 k
V.29
7.5
1 k
1.5 k
V.27ter
6
0.8 k
1.3 k
V.21
3.4
0.6 k
0.8 k
T.30
2.5
1.2 k
2.4 k

Algorithm Verification

•	The fax software implementations follow the specifications of the ITU standards. Performance and 
acceptance tests are performed against popular fax cards.

Availability

•	The software is available now and demonstration is available at GAO's offices in Toronto, Canada.

Company Background and Contact Information

GAO Research & Consulting Ltd. is an established international supplier of DSP algorithms, 
software, and systems for the telecommunications market. It provides a complete line of telephony, 
fax, and modem solutions. Its products have been widely reported by over 30 leading publications in 
the industry.
GAO currently employs about 20 DSP engineers. It was founded in 1991 and has been managed by Dr. 
Frank X.Y. Gao.
Contact:	Dr. Frank X.Y. GAO, CEO
		GAO Research & Consulting Ltd.
		55 Nugget Avenue, Unit 204
		Scarborough,  Toronto
			Ontario, Canada M1S 3L1
		(416) 292-0038
		Fax: (416) 292-2364
		e-mail: gao@io.org
		www: http://www.io.org/~gao