LEM-1 with SP-20N/A Ceiling Speaker, with and without Call Button

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These diagrams show how to connect an LEM-1 Answering Station to an SP-20N/A, both with and without an external, third-party call button.

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lem-1 with sp-20na (6 KB)
LEM-1 with SP-20NA, call button (88 KB)
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