Telephone/Fax Processing Unit
A processing device and facsimile technology, which is applied in the direction of telephone communication, interconnection device, digital voice transmission telephone, etc., can solve the problems of low channel utilization, large redundancy, and security that cannot meet military communication.
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[0013] refer to Figure 1 to Figure 2 , the present invention includes user relay interface 101, user relay interface 102, user relay interface 103, user relay interface 104, echo cancellation 105, echo cancellation 106, echo cancellation 107, echo cancellation 108, voice / Fax processing unit 110 , SRAM 111 , protocol processing and framing and deframing unit 109 , and level conversion module 112 . figure 1 It is the electric principle block diagram of the embodiment of the present invention, and the embodiment is according to figure 1 Wiring lines. Among them, the user trunk interface 101, the user trunk interface 102, the user trunk interface 103, and the user trunk interface 104 have exactly the same functions. Loop constant current feed, off-hook detection, ringing current relay drive, ringing current automatic cutoff, ringing current detection, polarity detection, analog off-hook and PCM codec, etc., the embodiment is made by commercially available user relay interface ...
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