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Posted: Sunday Oct 18th, 2020 02:13 am |
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slychiu
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On CM9001, the DSI01 plug in submodule includes the Ringer, Door station Mic/Voice, and Local Telephone support circuits, see http://www.cytech.biz/product_details.php?item_id=498 which includes the DSI01 manual download. This offloads the circuits and makes the CM9001 lower cost for those who do not need these features
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