Protea - Analogue Rotary Dial Phone
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1974 to 1996
This was the home phone that I grew up using up until I left home in 1995 and started using a Nokia 2110.
This phone was issued by the South African Post Office and was known as a Protea Phone.
A
rotary dial is a component of a telephone or a telephone switchboard
that implements a signaling technology in telecommunications known as
pulse dialing. It is used when initiating a telephone call to transmit
the destination telephone number to a telephone exchange.
On the rotary dial, the digits are arranged in a circular layout so
that a finger wheel may be rotated with one finger from the position of
each digit to a fixed stop position, implemented by the finger stop,
which is a mechanical barrier to prevent further rotation.
When released at the finger stop, the wheel returns to its home
position by spring action at a speed regulated by a governor device.
During this return rotation, the dial interrupts the direct electrical
current of the telephone line (local loop) a specific number of times
for each digit and thereby generates electrical pulses which the
telephone exchange decodes into each dialed digit. Each of the ten
digits is encoded in sequences of up to ten pulses so the method is
sometimes called decadic dialling.
An
ElectroMagnetic Bell was used as the Call alert. An Electromagnet would
strike a set of metal bells inside the phone to alert when a call came
in.
| General | Protea Analogue Rotary Dial Phone | ||
| System | Analogue Plain Old Telephone System (POTS) |
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| Hardware | Analogue |
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| Storage |
None | ||
| Display | None |
||
| Audio | Microphone | One, for Calling | |
| Earpiece |
One, for Calling | ||
| Output | None |
||
| Alert Types | ElectroMechanical
Bells
|
||
| Connectivity | Analogue
Phone Line (POTS) - using Protea connector plugs. The female would be
screwed to the skirting board and the male plug was connected to the
phone. |
||
| Features | None |
||
| Sensors | None |
||
| Battery | None | ||
| Charging | Power provided to phone over Phone Line |
||
| Weight | - |
||
| Dimensions | - |
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| SIM | None - Identity provided at Telco Exchange. |
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