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The AT&T (also Lucent, now Avaya) Merlin telephone system was introduced in late 1983, branded American Bell Merlin. After the breakup of AT&T in 1984, it was rebranded AT&T Merlin. It was designed at the beginning of the 1980s prior to the Bell System Divestiture as a modern electronic replacement for the dated electromechanical 1A2 Key System. Earlier Bell attempts at an electronic key system, such as the Horizon and Dimension, were not as successful as they were much larger systems, in fact the Dimension was a PBX. The Merlin was the first small electronic system, replacing the Com Key 416. The Merlin system was originally sold in two-line, six-telephone (206); four-line, 10-telephone (410); and eight-line, 20-telephone (820) configurations. Later, there was a further 10-line, 30-telephone configuration, with an expansion KSU allowing the system to accommodate up to 70 telephones available (1030 and 3070 respectively). ==Predecessors== The 1A2 Key Telephone System and later ComKey series (4-16, 7-18, 14-34) had the following problems which the Merlin System sought to solve: * Complex electromechanical line switches in every telephone * Each individual line pair plus control and light pairs must be run to each individual telephone, making for expensive on-premises wiring * Telephones were connected to one another using labor intensive point to point wiring * Control units consisted of many separate components including a power supply, line and feature module carrier, and punch blocks * Compared to more modern designs emerging in the 70's, manufacturing and maintaining the system became very expensive, especially by the 1980s * Basic features were present such as line switching, intercom, and hold but there was little possibility for addition of modern features 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AT&T Merlin」の詳細全文を読む スポンサード リンク
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