Transmission Techniques
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Baseband transmission – |
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To transmit encoded signals over cable, we mainly use two techniques such as Baseband transmission and broadband transmission. |
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Baseband systems use digital signaling over a single frequency. Signals flow in the form of discrete pulses of electricity or light. |
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As the signal propagates along the cable, it gradually decreases in strength and can become distorted. |
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To overcome this problem Baseband system sometime s use repeaters. |
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Repeaters receive an incoming signal and retransmit it at its original strength and definition. Thereby increasing the practical length of a cable. |
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Broadband Transmission – |
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Broadband systems use analog signaling and a range of frequencies. |
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With analog transmission the signals employed are continuous and non discrete. |
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Signals travel across the physical medium in the form of electromagnetic or optical waves. |
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To regenerate analog signals broadband systems use amplifiers. |
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Because the signal flows in broadband transmission is unidirectional, there must be two paths for data flow. |
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The two common ways to accomplish this are |
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i) Mid-split broadband configuration divided the bandwidth into two channels; one is used for transmitting signals, the other is for receiving. |
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ii) In dual cable broadband configuration, each device is attached to two cables. One is used to send and the other to receive. |