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how intercoms interconnect each other without paging system

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umair86

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Hello! every one

Hi, I want to know how intercoms interconnect each other with out any paging system, I have 6 intercoms of COMMAX, I am also uploading connection diagram .PDF of those intercom , I need to do the switching between each intercom by 89c51, but the problem is that I don't know any thing about intercoms inter connections and their switching.. please help me out, I know it sounds really stupid but I need information regarding intercom communication systems.. looking forward for your help..
 

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