36 CFR Part 1193 Telecommunications Act (Section 255) Accessibility Guidelines

Subpart D — Requirements for Compatibility With Peripheral Devices and Specialized Customer Premises Equipment

Section 1193.51 Compatibility

Paragraph (a)

External Electronic Access to All Information and Control Mechanisms

1. Some individuals with severe or multiple disabilities are unable to use the built-in displays and control mechanisms on a product.

2. The two most common forms of manipulation-free connections are an infrared connection or a radio frequency connection point. Currently, the Infrared Data Association (IrDA) infrared connection point is the most universally used approach.

3. The Infrared Data Association together with dominant market players in the cellular and paging industries, Ericsson, Matsushita/Panasonic, Motorola, NEC, Nokia, NTT DoCoMo, Puma, and TU-KA Phone Kansai, announced on April 25, 1997 a proposed set of standards that will empower wireless communication devices, such as cellular phones, pagers and personal computers to transfer useful information over short distances using IrDA infrared data communication ports. Because the proposed standard is designed to be scalable, it is easy-to-adopt by a wide range of wireless devices from pagers to more enhanced communications tools such as smart phones.

4. Adding an infrared connector to the serial port of a peripheral device or specialized customer premises equipment will make these products more compatible with each other and with customer premises equipment.

5. An infrared link can provide a mechanism for providing access to smaller, more advanced telecommunication devices and provide a safety net for products which are unable to incorporate other technologies. There is a joint international effort to develop a Universal Remote Console Communication (URCC) protocol which would achieve this functionality.

Paragraph (b)

Connection Point for External Audio Processing Devices

1. Individuals using audio peripheral devices such as amplifiers, telecoil adapters, or direct-connection into a hearing aid need a standard, noise free way to tap into the audio generated by a product.

2. Individuals who cannot hear well can often use products if they can isolate and enhance the audio output. For example, they could plug in a headphone which makes the audio louder and helps shut out background noise; they might feed the signal through an amplifier to make it louder, or through filters or frequency shifters to make it better fit their audio profile. If they are wearing a hearing aid, they may directly connect their hearing aid to the audio signal or plug in a small audio loop which allows them to couple the audio signal through their hearing aid's built-in T-coil.

3. Devices which can process the information and provide visual and/or tactile output are also possible. The most common strategy for achieving this requirement is the use of a standard 9 mm miniature plug-in jack, common to virtually every personal tape player or radio. For small products, a subminiature phone jack could be used.

Paragraph (c)

Compatibility of Controls with Prosthetics

1. Individuals who have artificial hands or use headsticks or mouthsticks to operate products have difficulty with capacitive or heat-operated controls which require contact with a person's body rather than a tool. Individuals who wear prosthetics are unable to operate some types of products because they either require motions that cannot easily be made with a prosthetic hand, or because products are designed which require touch of the human skin to operate them (e.g., capacitive touchscreen kiosks), making it impossible for individuals with artificial arms or hands to operate, except perhaps with their nose or chin. Some individuals who do not have the use of their arms use either a headstick or a mouthstick to operate products. Controls and mechanisms which require a grasping and twisting motion should be avoided.

Paragraph (d)

TTY Connectability

1. Acoustic coupling is subject to interference from ambient noise, as many handsets do not provide an adequate seal with TTYs. Therefore, alternate (non-acoustic) connections are needed. Control of the microphone is needed for situations such as pay-phone usage, where ambient noise picked up by the mouthpiece often garbles the signal. For the use of voice carry-over, where the person can speak but not hear, the user needs to be able to turn the microphone on to speak and off to allow them to receive the TTY text replies.

2. A TTY can be connected to and used with any telecommunications product supporting speech communication without requiring purchase of a special adapter, and the user is able to intermix speech and clear TTY communication. The most common approach today is to provide an RJ-11 jack. On very small products, where there may not be room for this large jack, a miniature or subminiature phone-jack wired as a "headset" jack (with both speaker and microphone connections) could be used as an alternate approach. In either case, a mechanism for turning the phone mouthpiece (microphone) on and off would reduce garbling in noisy environments, while allowing the user to speak into the microphone when desired (to conduct conversations with mixed voice and TTY). For equipment that combines voice communications, displays, keyboards and data communication functions, it is desirable to build in direct TTY capability.

Paragraph (e)

TTY Signal Compatibility

1. Some telecommunications systems compress the audio signal in such a manner that standard signals used by a TTY is distorted or attenuated preventing successful TTY communication over the system. A TTY can be used with any product providing voice communication function.

2. The de facto standard of domestic TTYs is Baudot which has been defined in ITU-T Recommendation V.18. Although the V.18 standard has been adopted, products are not yet available which meet its requirements.

3. This provision can be addressed by ensuring that the tones used can travel through the phones compression circuits undistorted. It is even more desirable to provide undistorted connectivity to the telephone line in the frequency range of 390 Hz to 2300 Hz (ITU-T Recommendation V.18), as this range covers all of the TTY protocols known throughout the world. Although it may not be achievable with current technology, an alternate strategy might be to recognize the tones, transmit them as codes, and resynthesize them at the other end. In addition, it should be possible for individuals using TTYs to conduct conversations with mixed voice and TTY, and to control all aspects of the product and receive any messages generated by the product.