The term of this business telephone system originated from
the bell system. This is to describe a manually operated switch like
line-buttons on the phone for instance that is related with the system. This
kind of phone system allows users to access or answer one or more central
office lines from one or more telephones. It also enables the users to place a
call on hold in order to respond to another incoming call. This kind of system
basically includes an intercom capability which allows a user to communicate
other users on the phones connected in the system.

Different
Architectural Designs of KSU

This business telephone system is designed principally to
three architectures; the electromechanical shared-control key systems, the
electronic shared-control systems, and the independent keysets. An
electromechanical shared-control key system is the oldest; being marketed in
late 1950?s and continued until 1980?s. It was intently designed for air traffic
control communications allowing the control tower and the radar approach
control or ground control approach. On the contrary, electronic shared-control
key system is the modern architecture that followed the electromechanical
shared-control key system. The wiring and cables were simplified and some
features were added like;

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Answering Machine Functions

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Supervision of the Entire System via Remote

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Automatic Call Accounting

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Speed Dialling

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Caller ID

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Specific Limitations for Stations (e.g. no
long-distance access, no paging, etc.)

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Signalling Sounds Selections

This design was the inspiration for the birth of the hybrid
phone system as another classification of business telephone systems. Another
design of KSU is the independent keysets which has the similar features of the
previous designs yet it does not require any single shared control unit any
longer.

Functional
Parts of KSU

This business telephone system has main functional parts and
they are the central service unit, the station cabling, the multi-button
telephone sets or the key telephones, and the power supply. The central service
unit, which is also called as the KSU itself, serves as a boundary and
switching centre between incoming lines and system telephones. The station
cabling connects each telephone to the central service unit. The multi-button
telephone sets or the key telephones provide access to the central office
lines, intercom, and special features. Lastly, the power supply converts the
electrical power to the specifications required by the business telephone
system.

There is also another variation of KSU that functions
different. This is the KSU-less system which generally offers similar
functionality and features without the expensive and specialized technology of
the basic KSU system. This makes this business telephone system a little cheap
and simple to set-up.

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