The 1A2 Key System is an analog multiline business key telephone system. Unlike more modern multiline systems, every telephone line serving a particular phone is wired into that phone, and electromechanical switches (the "keys") switch the lines in the phone itself. The original and largest manufacturer of 1A2 systems was Western Electric, later known as AT&T Technologies, Lucent Technologies, and now Avaya. Compatible 1A2 equipment was also manufactured by a number of vendors including Northern Telecom, and Automatic Electric (GTE).
Systems that have replaced 1A2 equipment include the AT&T Merlin, AT&T Spirit, and AT&T Partner systems. These are all now sold and/or serviced by Avaya.
Read more about 1A2 Key System: Components, Wiring, User Interface, Advantages
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