GAO Releases Fax, Data, and Voice Relay Software Package
July 30, 1998
Introduction
GAO Research & Consulting Ltd. is releasing a relay software package that offers fax, data, and voice relay functions. This package will allow OEMs to create devices that utilize digital
wireline or wireless links to carry multiple channels of fax, voice, and modem traffic over one voice channel. Some applications for this package include fax relay, voice over IP, and voice over
frame relay.
Media Release
Toronto, Canada: GAO Research & Consulting Ltd. has released a fax, data, and voice relay software package (GAO Relay Package). The GAO Relay Package is available in three versions: assembly
languages for the ADSP21xx family of DSPs from Analog Devices and the C54x family of DSPs from Texas Instruments, and in fixed-point C for microprocessors.
The GAO Relay Package allows OEMs to create devices that utilize a single digital wireline or wireless voice channel to carry multiple channels of fax, modem, and voice traffic. The Package
complies with the ITU standards for
- Fax: V.21 Channel 2, V.27ter, V.29, V.17, and T.30 for fax relay
- Data: V.22 / V.22bis, V.32 / V.32bis, and V.34 for data relay
- Voice: G.711, G.723.1, and G.729A for voice relay
- Fax, data, and voice control
It also includes telephony features such as G.165 Line Echo Canceller, Dual Tone Multi-Frequency Generator/ Decoder, Automatic Gain Control, Caller ID, and Call Progress Detector. Some
applications for the GAO Relay Package include fax relay, voice over IP, and voice over frame relay. According to Dr. Frank Gao, CEO of GAO Research & Consulting Ltd., “The GAO Relay Package is
designed to provide both corporate users and service providers with an effective means of utilizing digital transmission, whether over wire, satellite, or RF links, to create the most flexible
solution for their communications needs.”
For illustrative purposes, the diagram below depicts the unidirectional transmission of a fax relay signal over a single channel. The signal is sent from fax machine 1, demodulated by processor 1,
transmitted along a digital link, modulated by processor 2, and received by fax machine 2. The GAO Relay Package performs the demodulation, modulation, and fax relay control functions in this
example.
Example of unidirectional transmission using GAO FAX RELAY