Updating intercom and radio system
1A equipment was primitive and required at least two KTUs per line; one for line termination and one for station (telephone instrument) termination.
The telephone instrument commonly used by 1A systems was the WECo 300-series telephone.
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A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging from small key telephone systems to large-scale private branch exchanges.
A business telephone system differs from an installation of several telephones with multiple central office (CO) lines in that the CO lines used are directly controllable in key telephone systems from multiple telephone stations, and that such a system often provides additional features related to call handling.
Automatic Electric Company also produced a family of key telephone equipment, some of it compatible with Western Electric equipment, but it did not gain the widespread use enjoyed by Western Electric equipment.These continued to be used throughout the 1980s, when the arrival of electronic key systems with their easier installation and greater features signaled the end of electromechanical key systems.Two lesser-known key systems were used at airports for air traffic control communications, the 102 and 302 key systems.With a key telephone system, a station user could control the connections directly using line buttons, which indicated the status of lines with built-in lamps.Key telephone systems are primarily defined by arrangements with individual line selection buttons for each available telephone line.
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The 6A systems were complex, troublesome and expensive, and never became popular.