ABK AXT8921A, Руководство пользователя

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2
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Built-in 2 short-circuit inputs.
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Built-in 2 short-circuit outputs. 4 controlled methods: remote DTMF, remote service
command, short-circuit input linkage and call status.
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External active speaker output interface.
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Support POE power supply.
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With multicast function.
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Three functions in one: intercom, broadcast and smart security.
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In compliance with IP54.