Deafness

No useful hearing (in the context of telephone usage) necessitates the use of visual modalities, eg. text Telephony.

Fax and Email: are not satisfactory alternatives as they do not allow for real-time conversations. By making use of relay facilities, textphone connections can be made with any voice subscriber.

Essential Features
Visual ringing signal	Text display - visual
Dial-out buffer memory	Text send protocol select
Key feedback - tactile	Visual line status display
Key feedback - displayed	Coupling to computer
Text send - keyboard	Non-slip base.
Desirable Features
Additional earphone	Plug-in display
Plug-in keyboard	VDU text adjustable

Disability category links
Hearing impairment - moderate	Speech impairment - severe
Hearing impairment - severe	Limited dexterity
Deafness	Limited use of hands/arms
Visual impairment - moderate	Weak grip
Visual impairment - severe	Hand tremor
Blindness	Cognitive impairment
Deaf-blindness	Restricted mobility (lower limb)
Speech impairment - moderate

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