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Which device among following is used for sending digital data over a phone line?

Which device among following is used for sending digital data over a phone line? Correct Answer USB

ডেটা কমিউনিকেশন করার জন্য কম্পিউটার বা অন্যান্য Electronic device কে যুক্ত করতে যে সকল Instrument ব্যবহার করা হয় তাদের মধ্যে Modem অন্যতম। এর সাহায্যে Digita single কে Analog single এ এবং Analog singal কে Digital single এ রুপান্তর করা যায়। এ জন্য ডেটা কমিউনিকেশন সিস্টেমে প্রেরক এবং গ্রাহক উওভয় প্রান্তেই Modem প্রয়োজন হয়।

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Which device among the following is used for sending digital data over a phone line?
Which device among the following is used for sending digital data over a phone line ?
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Who is the vice among following is used for sending digital data over a phone line?