Installation manual

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In the 1970s, AT&T introduced the ComKey system (an update to the 1A2
system with a few more features) and the Horizon system, about which I
know very little.
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AT&T’s first true Electronic Key Telephone System was the Merlin,
introduced in 1984, and through evolution, still made today.
2
(See
“Overview of Merlin Phone Systems” from this same author.)
2
Merlin evolved from handling small to medium installations in the 1980s, to today’s Merlin
Magix, targeted at medium-sided business. There are no small Merlin offerings from Avaya;
Partner ACS is the only such offering. See the appendix for a detailed comparison.