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For persons
who are deaf or have a severe hearing impairment it is essential
that they can see some form of visual signal for incoming calls.
Visual signals
incorporated in the terminal are not easily seen and are mainly
of use as a reminder of line status. Socket connections should
be provided so that external indicator lights can be powered from
the terminal, either directly or from the mains supply thr size="2" width="50%" size="2" width="50%"ough
a relay. Alternatively, systems which cause the domestic lights
to flash can be used.
Vibrating pagers are an alternative to flashing lights.
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