ITU/TDD modem

Details ITU/TDD modem ITU/TDD modem

1996-07-19

1997-11-11

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

375222, 375225, 379 52, H04M 1100

Patent

active

056872224

ABSTRACT:
A communication system includes an ITU/TDD/VOICE modem that is connected to a local computer and a telephone line. The ITU/TDD/VOICE modem allows transmission and reception of ITU, TDD, and voice signals over the telephone line to and from a remote device. Examples of remote devices include a remote TDD or ITU modem (which connects to a remote computer), or a telephone. The ITU/TDD/VOICE modem may operate in various modes including (1) a computer communications mode and (2) a stand alone mode. During computer communications mode, the ITU/TDD/VOICE modem is controlled by the local computer. During stand alone mode, the ITU/TDD/VOICE modem operates independently of the local computer. The stand alone mode may further include an answering machine mode and prestored outgoing message mode. The ITU/TDD/VOICE modem includes various other features including one or more of the following: a particular utilization of the transmit/receive LED's in TDD mode; the ability to reacquire a new ITU or TDD connection from TDD mode (i.e., reacquisition mode); techniques for minimizing answer tone duration; techniques for modem status query; techniques for silencing Baudot or ITU modulation during voice carry over or hearing carry over; uses for audio-in and audio-out connectors.

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Brochure for NexCom I modem, marketed by Nexion, Inc. undated (two pages).
Brochure for Superprint modem, marketed by Ultratec, undated (two pages).
Brochure for MIC300i modem, marketed by Microflip, Inc., undated (two pages).

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