Seen Comprehension - 31 Alim
Fax
Document exchange through facsimile (popularly know as fax) systems is emerging as a major application of telecommunication due to its speed of transmission. A telephone connection is necessary for operating it. The fax machine is capable of transmitting and receiving printed matter which may include graphics, drawings, pictures, handwritten texts etc. This is highly suitable for business and official purposes which deal mostly with paper documents. There are two types of fax systems -- the photographic and the document. In the photographic fax, black and white, as well as gray level information is transmitted and printed. Typically there are 8 and 16 levels that can be recognized by the system. The document system handles only black and white levels. Generally the document facsimile is more popular than the photographic system. The receiver/ transmitted functions, which are applicable to both the type of fax systems are shown in the following figure.
Scanning Printing
Compression Decompression
Transmission ------------------------------------------> Reception
Faxed messages are received immediately after being sent and has thus become an important tool for correspondence in the world of business, trade and commerce. It is also used for many different types of personal and official correspondence. It is cheaper than using the telephone. It takes less than a minute to fax one A4 size page of written message from Dhaka to Chittagong, Rajshahi, Khulna, Barishal, or any other town in Bangladesh, and it costs about 25 taka for that. The same message would take about 5 minutes over the telephone and would cost 3-4 times more than what it takes to fax. That is why people prefer that fax to the telephone.
Input document Output document
Scanning Printing
Compression Decompression
Transmission ------------------------------------------> Reception
Faxed messages are received immediately after being sent and has thus become an important tool for correspondence in the world of business, trade and commerce. It is also used for many different types of personal and official correspondence. It is cheaper than using the telephone. It takes less than a minute to fax one A4 size page of written message from Dhaka to Chittagong, Rajshahi, Khulna, Barishal, or any other town in Bangladesh, and it costs about 25 taka for that. The same message would take about 5 minutes over the telephone and would cost 3-4 times more than what it takes to fax. That is why people prefer that fax to the telephone.
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