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Document ID: DJON-3G7J2T |
Aptiva - Using a TDD to communicate with another computer
Applicable to: United States
A TDD is a Tele-Communications Device for the Deaf. It is a special machine that is needed to communicate with the deaf, hearing impaired and speech impaired person(s) over the phone lines, as well as computers. There have been some questions posted about using a TDD and a computer for the means of communication.
For those who have a TDD, you will not be able to communicate with an ASCII computer's modem or vice versa. The baud speeds are different in ASCII and BAUDOT modes. All computer modems are in ASCII mode and 95% of the people in the United States who have TDDs are in BAUDOT mode. There are some TDDs that contain ASCII modes built-in and they are capable of communicating in both ASCII and BAUDOT modes.
A BAUDOT TDD contains 45.5 Baud, 1 Start Bit, 5 Data Bits, and 1.5 Stop Bits. With an ASCII TDD modem or an ASCII computer modem, you can set the baud at 110 or 300 Baud, Half or Full Duplex, Answer or Originate mode, 8 or 7 Data Bits, 1 or 2 Stop Bits, No Parity, Xon/Xoff or No Handshake.
To understand the BAUD, BAUDOT and ASCII modes, the definitions for the following are:
BAUD: A measurement in bits per second of the speed with which information is transmitted between two computer devices, such as a modem and a printer. The baud rate for Baudot is 45.5 or 50 (International Code). The baud rate for ASCII can be 110, 300 1200 or 2400.
BAUDOT: A standard code or protocol for representing characters of the alphabet and numbers used by TDDs which uses 5 stop bits per character. (Named by Emily Baudot, a pioneer in printing telegraphy).
ASCII: American Standard Code for Information Interchange. A 6, 7, or 8-bit (data bits) characters coding technique which enables computers made by different manufactures to interpret patterns of bits in the same way. Letters, numbers, punctuation and special control characters such as carriage return and line feed are translated into binary numbers. With ASCII code, a computer can send and receive 128 different letters, numbers and symbols.
OTHER DEFINITIONS:
BIT: The smallest component of a code. A bit is a tiny electronic signal that computers and TDDs can send and receive.
MODEM: An electronic device that connects a computer to the telephone lines.
PARITY: Settings which provide an automatic way to make sure that each letter, number or symbol received is the same as each one sent.
HALF and FULL DUPLEX: Settings which determine how the computer or TDD displays the messages you send and receive. They shall be set the same DUPLEX settings.
NOTE: The following manufacturers are not endorsed by IBM. They are simply suggested manufacturers to assist with your TDD needs. There are three major TDD manufacturers: Krown Research Inc., UltraTec Corporation, and AT & T. They manufacture modems for computers and/or TDDs.
For more information in obtaining modems or TDD devices, you can call or write to the manufacturers.
INTERNATIONAL KROWN TECHNOLOGIES
129 Sheldon
El Segundo, CA 90245
(310) 518-2122 (Voice/Tdd)
Ask for Customer Support.
Hours: Mon.-Fri., 7:00am-3:30 pm PST.
ULTRATEC CORPORATION
450 Science Drive
Madison, WI 53711
(608) 238-5400 (Voice/Tdd)
AT & T ACCESSIBLE COMMUNICATION PRODUCT CENTER
2001 Route 46, Suite 310
310 Parsippany, NJ 07054-1315
(800) 833-3232 (TDD)
(800) 233-1222 (VOICE)
NOTE: TDD's only, no modems at AT & T
International Crown and UltraTec Corporation have many distributors to sell their products. A few are:
Harris Communications
(Ultratec only and assistive devices)
6541 City West Parkway
Eden Prairie, MN 55344-3248
(612) 946-0921 (Voice)
(612) 946-0922 (TDD)
(612) 946-0924 (Fax)
TOLL FREE: 1 (800) 825-6758 (Voice) 1 (800) 825-9187 (TDD)
Hours: Mon.-Fri., 9:00am-5:30pm CST Saturday, 11:00am-3:00pm CST
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Search Keywords |
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Hint Category |
Modems, Non-IBM Hardware/Software | |
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Date Created |
16-04-97 | |
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Last Updated |
15-03-99 | |
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Revision Date |
15-03-2000 | |
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Brand |
IBM Aptiva | |
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Product Family |
Aptiva, PS/1 | |
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Machine Type |
2011, 2134, 2144, 2168, 2176, 2121, 2123, 2133, 2155 | |
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Model |
6R6; C21; C31; C32; 6R9; C31; F31; C6D; 8R6; 8R9; 9R4; 6R8; 7R1; 7R3; 7R6; 7R7; 7R9; 7RO; 8R1; 8R8; 9R2; 9R3; C23; C33; C35; C55; C56; C65; C66; C67; C6V; C6Y; C6Z; C73; C76; C77; F23; F33; F35; F67; 5R5; M91; 2R5; 2R7; 2R8; M30; M35; M50; 2R6; 4R7; 4R8; M40; M54; M58; 3R0; 3R8; M60; M70; 3R4; 3R6; 4R1; 4R9; M31; M51; M52; M63; 2R9; 3R1; 3R3; 3R5; 3R7; 3R9; 4R0; 4R2; 4R3; M41; M53; M55; M56; M57; M61; M62; M71; M72; 5R1; 6R3; A10; A12; A14; 5R2; 5R3; 5R6; 5R8; 5R9; 6R0; 6R4; 6R5; A15; A40; A44; A45; A50; A51; A52; A90; A92; A94; 1R2; 66P; 67P; 86P; OR8; 1R1; 1R3; 1R5; 22P; 24P; 25P; 27P; 29P; 63P; 67P; 82P; 83P; OR6; OR7; OR9; 1R0; 1R1; 26P; 62P; 2R0; P30; C01; C34; M01; NEA; T35; U35; A62; A82; A94; B82; C42; C92; G42; M82; S92; 081; 087; 131; 137; K37; N31; N81; 11E; 13T; 14C; 16E; 17A; 18A; 18T; 19C; 21C; 23C; 28A; 46M; 51D; D50; G11; G13; G43; G46; G46; G49; G49; G50; G53; M40; M40; M46; M46; P11; P13; P43; P50; P53; R04; R05; R06; R09; R38; R42; R43; R44; R84; R86; R87; RO3; S11; S13; S43; S45; S45; S47; S47; S48; S48; S50; S53; W11; W13; W42; W42; W43; W45; W45; W50; W53; 20E; 22T; 24C; 24M; 28V; 39E; 41T; 43C; 45V; 48E; 50T; 52C; 55V; 72E; 74T; 76C; 78C; 79C; 81A; 82E; 84T; 86C; 87C; CC1; D53; G14; G44; G52; G54; G72; G76; G78; G82; NM1; P14; P44; P57; P71; P74; P76; P78; P84; R14; R15; R16; R17; R18; R51; R52; R57; R58; R62; R63; R67; R71; R89; R93; R96; R97; S14; S44; S50; S54; S70; S75; S76; S78; S80; W14; W44; W48; W54; W67; W76; W77; W78; Z33; 28V; 31E; 33T; 37C; 38C; 51E; 54T; 56C; 57C; 88V; BB1; G57; G87; OR1; OR3; OR4; OR5; P89; R28; R29; R31; R74; R78; R82; R98; S55; S85; SR1; US1; W52; W82; 2R3; S15 | |
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TypeModel |
2011C01 | |
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